English Abstract

Study of Mechanical and Heat-fusion Properties of Silicone Rubber added Polysilane

Taichi SUGIE *1
Katsuhisa TOKUMITSU *1
Mai SUGIE *2
Masakazu HATTORI *2
*1:Department of Materials and Science, School of Engineering, The University of Shiga Prefecture, Hassaka-cho, Hikone
*2:Fuji Polymer Industries Co., Ltd., NagoyaAichi
Nippon Gomu Kyokaishi,(2022),95(9),259-265 Original Paper in Japanese

The effects on the mechanical properties and cross-linking reaction as well as on the heat fusion properties of silicone rubber (PDMS) with/without polysilane (PMPS) were investigated. First, as a result of uniaxial tensile test and dynamic viscoelasticity measurement, although no change was observed in the cross-linking structure itself, the value of the molecular weight between the cross-linking points increased with the increase in the amount of PMPS added. On the other hand, regarding the cross-linking reaction process, the exothermic peak temperature during the cross-linking reaction decreased with PMPS content though, the enthalpy of the reaction did not change. Regarding the heat-fusion properties, it was found that although neat PDMS did not heat-fuse, both the PMPS-added PDMS sample and the solvent-extracted PDMS sample showed heat fusion characteristics. The reasons are as follows: 1. In the PMPS-added PDMS sample, many large network structures and free-ended chains are present when the cross-linked structure is formed, and these favor the entanglement of the PDMS molecular chains during heat fusion. 2. PMPS has the effect of improving the motility of PDMS molecules, and since the activation energy of diffusion in PDMS was as low as 11.3 kJ¥mol-1, PMPS diffused at the fusion interface.

Keywords: Silicone Rubber, Polysilane, Cross-linking Reaction, Mechanical Property