英語セッション(English Session)

1day (11.26) Venue D
2day (11.27) Venue C 2day (11.27) Venue D

1day : 2020.11.26 (Thu)

10:00 - 10:20

D1 Characterization and properties of liquid epoxidized natural rubber (LENR) in latex stage and its up-scale process

〇Nurul Hayati Yusof・Dazylah Darji・Fatimah Rubaizah Mohd Rasdi・Krishna Veni Baratha Nesan・Suhawati Ibrahim (Malaysian Rubber Board)

Liquid epoxidized natural rubber (LENR) is one of the epoxidized natural rubber (ENR) derivatives, which exhibited viscous and sticky appearance due to the low molecular weight. It is considered a green material since it is produced from a renewable resource. LENR was successfully prepared by chemical degradation of epoxidized natural rubber in the latex stage in the presence of degrading agents and surfactant. Several parameters such as surfactant concentrations, chemical concentrations, etc. were studied. The characterizations of the material were made with gel permeation chromatography (GPC), gel content and Fourier transform infrared spectrometer (FTIR). The shelf life of LENR also was studied. The optimized condition of LENR was used for the up-scale production of LENR using a 400-liter reactor.

10:20 - 10:40

D2 Study on the porperties of Epoxidized Natural Rubber compound

〇Jongyeop, LEE (Hankook Tire & Technology R&D Center)

Rubber and reinforcing agents (Carbon black or Silica) are the most commonly used in tire materials, and the use of silica is essential to meet the low fuel efficiency and traction performance.However, natural rubber is not mixed with silica due to different polarity, so there is a limit to replacing functional synthetic rubber.Therefore, in this study, we have identified the potential to satisfy the required performance of tires, such as low fuel efficiency, traction, abrasion resistance by ENR with various reinforcements.

10:40 - 11:00

D3 Development of natural rubber based quasi-solid polymer electrolytes electrolytes

〇Rathanawan Magaraphan・Pensiri Silakul (Chulalongkorn University)

Natural rubber (NR) is usually known as an insulator with resistance in order of 1015 ohm. Surprisingly, in this work, natural rubber was successfully used as a conductive polymer by introducing on natural rubber particles with the shell of polar polymer, poly(3-(trimethoxysilyl) propyl methacrylate) (PMPS) using surface grafting polymerization to form PMPS-g-NR. Moreover, ozonolysis on PMPS-g-NR at different treatment time yielded products of improved conductivity more than 1 mS/cm and photovoltaic conversion efficiency for dye-sensitized solar cell also increased. Importantly, these NR-based polymer electrolytes not only bring about the flexible solar cell but also show improved stability or longer lifetime over the common liquid electrolyte.

11:00 - 11:20

D4 Manufacturing of ion conductivity polymer electrolyte film based on epoxidized deprotein natural rubber

〇Trinh Thi Hang・Phan Trung Nghia・Le Cao Chien (Ha Noi university of science and technology)

Ion conductivity polymer electrolyte film based on epoxidized deprotein natural rubber (EDPNR) and lithium salt lithium trifluoromethanesulfonate (LiCF3SO3) were prepared by solution casting technique. The EDPNR was prepared from deprotein natural rubber latex (DNR) epoxidized in the latex stage with fresh peracetic acid 33%, which was deproteinized by incubation of the latex with 0,1 wt% ure and 1wt%  surfactant. The ionic conductivity of EDPNR mixed with lithium salt was investigated through impedance analysis. The results show that the conductivity of EDPNR/ LiCF3SO3 mixture was dependent on LiCF3SO3 salt concentration and amount of epoxy group. The highest room temperature ionic conductivity obtained is 1,71 x 10-5 S.cm-1 at 35 wt% LiCF3SO3 and 45 mol% epoxy groups. Fourier transform infrared spectroscopy (FTIR) spectra showed evidence of complexation between EDPNR and LiCF3SO3 . Glass transition temperature, Tg displayed an increasing trend with increase in salt concentration and increased epoxy group content.

11:20 - 11:40


〇Manuchet Nillawong・Usana Yamkayan・Adun Nimpaiboon・Chakrit Sirisinha・Krisda Suchiva (Mahidol University)

Differentiation of processing properties of raw natural rubber (NR) is of interest to rubber products manufacturers which constantly experience processing difficulty of NR due to its variations. Conventional characterization techniques such as plastometry, Mooney viscometry, and small amplitude oscillating die rheometry do not give satisfactory predictions of the mixing behavior of NR, presumably due to low applied strain rate of the tests. Investigations were made to apply new, largely unexplored, methods of measurements of rheological properties of NR. These include capillary rheometry and large amplitude oscillatory shear (LAOS) rheometry. The results reveal potential uses of LAOS rheometry for improved characterization of processability of raw NR.

11:40 - 12:00

D6 Utilization of rubber tree leaves as low cost bio-sorbent for the removal of heavy metal ions from water

〇Vu Duc Thao (Hanoi University of Science and Technology)

13:20 - 13:40

D7 Enhancement of cure reversion resistance of natural rubber using a novel co-cure agent

〇Changwoon Nah・Beomsu Shin・Suhyun Kim (Jeonbuk National University)

Abstract: A novel co-cure agent, 4, 4'-bis (maleimido) diphenyl methane (BMDM) was employed as a co-cure agent to solve the poor reversion resistance of conventional sulfur-cured natural rubber vulcanizates. The BMDM serves as an excellent anti-reversion agent during the vulcanization of NR at elevated temperature. Moreover, it remarkably increased the crosslink density and improves the set properties of NR vulcanizates.

13:40 - 14:00

D8 Vulcanization mechanism of natural rubber

〇Seiichi Kawahara (Nagaoka University of Technology)
Takayuki Saito (CERI)
Yoshimasa Yamamoto (National Institute of Technology, Tokyo College)


14:00 - 14:20

D9 Characterization on fatigue mechanism of carbon nanotube filled rubber using Atomic Force Microscope.

〇Ruoyu Han・Yuichi Aoyagi (NOK Corporation)
Ken Nakajima・Xiaobin Liang (Tokyo Institute of Technology)


14:20 - 14:40

D10 Development of Wastewater Treatment System for Rubber Industrial Wastewater

〇Takahiro Watari (Nagaoka University of Technology)・Fuminori Yoneyama (Sumitomo Riko)・Kazuaki Syutsubo (National Institute for Environmental Studies)・Masashi Hatamoto (Nagaoka University of Technology)・Osamu Wakisaka (Sumitomo Riko)・Takashi Yamaguchi (Nagaoka University of Technology)


14:40 - 15:00

D11 Study of Mechanochemical Wear Behavior on Hydrogenated and Conventional SBRs

〇Shinya Nakano・Takahiro Mabuchi・Takanobu Kawamura (Sumitomo Rubber Industries)

The effect of hydrogenation was studied for SBR in terms of the mechanochemical wear.

15:00 - 15:20

D12 Crack-tip Strain Field in Supershear Crack of Elastomers

〇Thanh-Tam Mai (Kyoto Institute of Technology)
Kenichiro OKUNO・Katsuhiko TSUNODA (Bridgestone Corporation)
Kenji URAYAMA (Kyoto Institute of Technology)


2day : 2020.11.27 (Fri)

Venue C

10:00 - 10:20

C13 Confined and Hidden Crystallization of PEG in a PLLA Spherulite in 50/50 blend

〇Banpean Apisit・Shinchi Sakurai (Kyoto Institute of Technology)

Confined and hidden crystallization of PEG in PLLA/PEG (50/50) blend specimens were studied by POM and DSC

10:20 - 10:40

C14 Toughened PLA-PCL-PLA Triblock Copolymers for Biomedical Applications

〇Neha Mulchandani・Kazunari Masutani・Hideki Yamane・Shinichi Sakurai・Yoshiharu Kimura (Kyoto Institute of Technology)
Vimal Katiyar (Indian Institute of Technology)

Thermal and mechanical properties, and biocompatibility of the synthesized triblock copolymers were examined

10:40 - 11:00

C15 Effect of proteins on the mechanical properties of natural rubber

〇赤堀弥生 (長岡技術科学大学)
日座操 (横浜ゴム㈱)
山口颯毅・河原成元 (長岡技術科学大学)


11:00 - 11:20

C16 Prevulcanization of natural rubber/polyaniline blend in latex stage

〇Nguyen Thu Ha・Tran Thi Thu Huong (Hanoi University of Science and Technology)
Toshiaki Ougizawa (Tokyo Institute of Technolog)
Seiichi Kawahara (Nagaoka University of Technology)

The latex of natural rubber/polyaniline is indispensable to prepare thin film for current and potential utilization. In this study, natural rubber/polyaniline blend latex was prepared through prevulcanization. It was indicated that up to 10 w/w% of polyaniline could dispersed in natural rubber latex in presence of 1 w/w% surfactant. The properties of prevulcanized blends were outstanding compared to those of vulcanized blends prepared in molten state in term of mechanical properties and electrical properties. SEM observation confirmed that the improvement of properties was attributed to good dispersion of polyaniline in natural rubber through the prevulcanization in latex stage.

11:20 - 11:40

C17 Study on the preparation and properties of NR with model nanomatrix structure

〇Yuanbing ZHOU・Hirotaka MIHARA・Seiichi KAWAHARA (Nagaoka University of Technology)


11:40 - 12:00

C18 Electrochemical Bromination and Epoxidation of Natural Rubber in Latex Stage

〇Yoshimasa Yamamoto (National Institute of Technology, Tokyo College)
Seiichi Kawahara (Nagaoka University of Technology)


Venue D

10:00 - 10:20

D13 Bio-based, reinforced, compression molded and dipped rubber products (1)

〇Katrina Cornish・Xianjie Ren・Cindy S.Barrera・David A. Ramirez-Cadavid・Sarah A. Davis・J. Lauren Slutzky (Ohio State University)

Sustainability of reinforced rubber products may be improved by development and use of fillers and processing aids derived from natural materials rather than petroleum.  We have investigated waste derived fillers, from macro to nano size, as partial and complete replacements of carbon black and bifunctionalized silica commercial fillers in different rubbers.  Also, we have used a guayule rubber-derived “processing oil” to protect the mechanical performance of natural and synthetic rubbers.  Polymer filler interactions vary with rubber source and filler, and guayule rubber and latex can hold higher amounts of filler than natural rubber from Hevea opening new product opportunities.

10:20 - 10:40

D14 Bio-based, reinforced, compression molded and dipped rubber products (2)

〇Katrina Cornish・Xianjie Ren・Cindy S.Barrera・David A. Ramirez-Cadavid・Sarah A. Davis・J. Lauren Slutzky (Ohio State University)

Sustainability of reinforced rubber products may be improved by development and use of fillers and processing aids derived from natural materials rather than petroleum.  We have investigated waste derived fillers, from macro to nano size, as partial and complete replacements of carbon black and bifunctionalized silica commercial fillers in different rubbers.  Also, we have used a guayule rubber-derived “processing oil” to protect the mechanical performance of natural and synthetic rubbers.  Polymer filler interactions vary with rubber source and filler, and guayule rubber and latex can hold higher amounts of filler than natural rubber from Hevea opening new product opportunities.

10:40 - 11:00

D15 Progress of TKS rubber in China

〇Zhang Liqun・Zhang Jichuan (Beijing University of Chemical and Technology)

Taraxacum kok saghyz (TKS) grows originally in the border areas between Xinjiang province of China and Kazakhstan. Because the root is rich in natural rubber (NR), it can be used as a beneficial supplement to the hevea rubber. TKS can be developed in the broad northern district of China which is the effective way to release the pressure of shortage of Chinese NR resources. The presentation introduces the progress of TKS rubber in China from germplasm construction, breeding technique, cultivating methods, extraction technique and comprehensive utilization. The existed data show that the present biomass of the TKS root is not enough large and the rubber bearing content is not enough high which cannot support the commercial development of TKS rubber. Therefore, it is very necessary to strengthen the international cooperation to increase the output of TKS rubber and accelerate the commercial development of TKS rubber.

11:00 - 11:20

D16 Modified Guayule Natural Rubber, their Compounds and Recycling Prospects

〇Santanu Chattopadhyay・S. Dhanania・G.B. Nando (Indian Institute of Technology Kharagpur)

The Guayule natural rubber (GNR) was chemically modified with phosphorylated cardanol prepolymer and the resultant PCP-g-GNR was proven to be a multifunctional additive. The PCP-g-GNR used as an additive, not only improved the rolling resistance and wet-skid resistance but also it reduced the requirements of the processing oil. The use of the PCP-g-GNR led achieving the green compounds and cost effectiveness with ease of processing. The variation of properties of vulcanizates of GNR with the different fillers was discussed in details. An easy and interesting devulcanization process for GNR and NR revulcanizates at similar conditions were also reported.

11:20 - 11:40

D17 Deciphering the Microstructure of Natural Rubber from Freshly tapped Hevea Brasiliensis latex

〇Jitladda Sakdapipanich (Mahidol University)

Natural rubber (NR) latex from Hevea brasiliensis is the most important bio-based-elastomers, exhibits high green strength and outstanding cured rubber properties, originating from its microstructure, compared with synthetic analogues. Therefore, a series of studies to decipher NR microstructure were carried out. These studies include the detailed structure of the w-initiating and a-terminating ends of fresh in vivo NR molecules in comparison with newly synthesized in vitro NR ones, using a high-resolution NMR and various analysis techniques. The relationship between its distinguishing microstructure, biosynthesis pathway of NR molecule in the rubber tree in connecting with the unique properties will be presented.

11:40 - 12:00

D18 Insight into the changes in allergenic proteins of natural rubber under electron beam irradiation

〇Adun Nimpaiboon・Wanicha Pakdee・Phattaraorn Havanapan・Promsak Sa-nguanthammarong・ Preeyanuch Junkong・Krisda Suchiva (Mahidol University)

Allergenic proteins in natural rubber (NR) latex, a cause of allergy to a small number of individuals, are the limitation for utilization of NR in medical applications. Electron beam (EB) offers a possible solution for the protein allergy issue, since the radiation can cause denaturing of NR proteins. However, the effect of EB on the allergenic proteins in NR latex still has largely been unknown. The aim of the present work is thus to investigate in details the effects of EB on the allergenic proteins of NR. Fresh NR latex was irradiated by EB at 0, 30, 50, 100, 150, 200, 250 and 300 kGy to obtain the EB vulcanized NR latex that was separated into cream phase and serum phase by centrifugation. The irradiated NR latex was then characterized by various techniques including modified Lowry method, Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) technique and mass spectrometry (MS)-based proteomic analysis. The results showed both quantitative and qualitative information of the proteins after EB irradiation and the changes of the proteins as a result of EB occurred by way of chain scission and crosslinking reactions.

13:20 - 13:40

D19 Natural Rubber Nanocomposites

〇Sabu Thomas・Hanna J Maria (Mahatma Gandhi University)

Nano-scale filler based rubber composites are finding use in high performance tyres with less weight and better fuel efficiency, better durability and having higher grip to the road than traditional carbon black based tyres. Rubber formulations filled with nano-scale fillers are complex polymer systems that show a number of interesting properties markedly different from those of unfilled molten polymers. In addition to usual hydrodynamics (or volume fraction) effects, reinforcing fillers such as carbon blacks or high-structure silica, impart modifications in flow properties whose origin is assigned to strong interactions arising between the elastomer and the filler particles. The talk will discuss new tyre formulations, the nature of rubber–nano filler interactions and their effects on rheological and mechanical and failure properties of the materials.

13:40 - 14:00

D20 Preparation of a chemically linked nanodiamond nanomatrix structure onto natural rubber

〇Asangi Gannoruwa (University of Sri Jayewardenepura)
Seiichi Kawahara (Nagaoka University of Technology)

A nanodiamond (ND) nanomatrix structure can be formed onto natural rubber (NR-ND), when deproteinized natural rubber (DPNR) was reacted with ND in the latex stage using tert-butylhydroperoxide/ tetraethylenepentamine as an organic redox initiator. Suitable conditions to form NR-ND were found to be 6.6 × 10-5 mol/g-rubber at 30°C in alkaline pH under N2 environment. Chemical linkages formed between ND and NR was evident from increase in Gel content, increase in crosslink density by swelling method and NMR spectral data. At 25w/w% ND loading the complex modulus for NR-ND was 1.33 MPa which was about 8.7 times higher compared to neat DPNR.

14:00 - 14:20

D21 Mechanical and viscoelastic properties of natural rubber with a hybrid nanomatrix structure

〇Nghiem Thi Thuong・Do Thi Thanh Hoa・Tran Duc Chien・Phan Trung Nghia (Hanoi University of Science and Technology)
Nurul Hayati Yusof (Malaysian Rubber Board)
Seiichi Kawahara (Nagaoka University of Technology)

Our work is aimed to investigate the mechanical and viscoelastic properties of natural rubber (NR) with a hybrid nanomatrix structure. The hybrid nanomatrix structure was formed by graft copolymerization of vinyltriethoxysilane onto NR after NR was grafted with styrene. This structure is composed of nano-silica, size less than 100 nm, and polystyrene covering NR particles. Tensile properties of NR with the hybrid nanomatrix structure increased 7 times, and storage modulus increased about 20 times compared to those of NR. The highly enhanced mechanical and viscoelastic properties of NR was due to the formation of the hybrid nanomatrix structure.

14:40 - 15:00

D22 Modified Natural Rubber as antibacterial promoter in poly(lactic acid) composite

〇Pranee Phinyocheep・Phruedsaporn Taranamai・Watanalai Panbangred・Mayura Janhom・Philippe Daniel (Mahidol University)

Poly (lactic acid), PLA, a bio-based polymer, is increasingly promoted for utilization in packaging and container applications as it is a biodegradable, biocompatible and renewable plastic. PLA is a hydrophobic and semi-crystalline polymer which limits the diffusivity of small molecule in PLA matrix. In this study, modification of natural rubber (NR) into epoxidized natural rubber (ENR) was used in blending with PLA together with silver substituted zeolite to prepare a composite with antibacterial activity. It was found that the hydrophilic ENR could enhance the efficiency in releasing Ag, hence improve the reduction of bacterial growth (S.Aureus) compared to the composite without ENR.

15:00 - 15:20

D23 Natural rubber polysaccharide nanocomposites – Preparation and Properties

〇Ulrich Giese・Irina Weilert (Deutsches Institut für Kautschuktechnologie)

Polysaccharides like nanofilibrated cellulose (NFC) are renewable materials with a high potential as active fillers for elastomers. Advantages are low density for saving weight and high strength in combination with high specific surfaces. Used NFC were characterized for their specific surface, particle size and chemical structure. The problem in the incorporation of the polar NFC, containing more or less water as raw material, into the rubber matrix is solved using a special latex compounding, pretreatment oft he NFC and coagulation strategy The resulting nanocomposites are characterized for vulcanization behavior and physical properties.

15:20 - 15:40

D24 Blown Film of Polylactic Acid/Natural Rubber Blends as Biobased

〇Cattaleeya Pattamaprom・Peerapong Chanthot・Supanat Phattarateera (Thammasat University)

Our group has long developed low-cost biodegradable packaging film based on polylactic acid (PLA) and natural rubber (NR). Our inspiration was the cost-competitiveness of PLA and NR and the oversupply of natural rubber worldwide. The challenges were the extreme incompatibility of PLA and NR and the poor processibility and thermal instability of PLA. In this talk, natural rubber will be compared with other rubbers on toughness improvement of PLA. Further improvement by natural rubber mastication and the use of additives was investigated on film blowing of the blends. The produced PLA/NR plastic bags will be benchmarked with relevant standards.

15:40 - 16:00

D25 Silanization Efficiency of Silica/Silane in Dependence of Amines in Natural Rubber-based Tire Compounds

〇Anke Blume・C. Hayichelaeh・L.A.E.M. Reuvekamp・W.K. Dierkes・J.W.M. Noordermeer・K. Sahakaro (University of Twente)

Silica-silane technology for low rolling resistance tire compounds requires efficient bridging between the silica surface and rubber molecules through silanization and coupling reactions. The presence of diphenylguanidine (DPG) as secondary vulcanization accelerator is also needed to catalyze the silanization reaction between the alkoxy groups of silane coupling agents and the silanol groups on the silica surface. However, DPG can liberate toxic aniline under high mixing temperatures. This study investigates the potential of amines with different structures to replace DPG as safer alternatives.

16:00 - 16:20

D26 Hybrid fillers and polymers for silica-NR tire tread compounds

〇Wisut Kaewsakul・Suppachai Sattayanurak・Jacques W.M. Noordermeer・Kannika Sahakaro・Wilma K. Dierkes・Louis A.E.M. Reuvekamp・Anke Blume (University of Twente)

To improve the properties of silica truck tire tread compounds, especially abrasion resistance, the effects of OrganoClay (OC) or Carbon Black (CB) N134 as secondary fillers, as well as Butadiene Rubber (BR) or Solution Styrene Butadiene Rubber (SSBR) as secondary polymers in silica-filled Natural Rubber (NR) compounds at a ratio of 80/20 phr, were investigated. The use of OC shows improvement in Payne effect and tan delta at 60oC, indicative for reduced filler-filler networking, and rolling resistance of a tire tread compound compared to the one without OC. Overall, the combination of BR and OC shows the best performance.

16:20 - 16:40

D27 Functional oligomers issued from natural rubber: use in the preparation of non-leaching antibacterial surfaces and hybrid silica-rubber particles 

〇Pamela PASETTO・T.T.N.Tran・A. Nourry・G. Brotons・Q. Tevenot・D. Vo・E. Choppé (Le Mans University)

The expertise of the team has been exploited to obtain telechelic functional oligomers from the controlled breaking of polyisoprene chains in natural rubber. Thin and thick cross-linked films based on such oligomers have been prepared with antibacterial properties inferred by tailor-made monomers. New oligomers have been synthesized for covalent grafting to different surfaces in order to make smart composite materials. Ongoing studies will be presented about the preparation of hybrid particles with polyisoprene shell and synthetic or bio-silica core.

16:40 - 17:00

D28 Cavitation in rubber vulcanizates subjected to constrained tensile deformation

〇Eric Euchler・Ricardo Bernhardt・Konrad Schneider・Gert Heinrich・Toshio Tada・Sven Wiessner・Markus Stommel (Leibniz-Institute of Polymer Research Dresden)

A special phenomenon in terms of microstructural failure of rubber materials is cavitation. Due to geometrical constraints, the lateral contraction of the rubber materials is suppressed even under uniaxial tensile deformation. As a result, stress triaxiality causes inhomogeneous deformation and internal defects, so-called cavities, appear. The formation and growth of cavities release stress and reduce the degree of constraints. Advanced experimental techniques, such as dilatometry, X-ray microtomography and small-angle X-ray scattering, have been used for in situ investigations. This presentation will show results of the comprehensive study on cavitation in styrene-butadiene rubber (SBR) vulcanizates.

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