Synthesis and Properties of Polyurethane Crosslinked by Polyrotaxane Consisting of Monoaminocyclodextrin

English Abstract

Synthesis and Properties of Polyurethane Crosslinked by Polyrotaxane Consisting of Monoaminocyclodextrin

Juae LIM ^*1

Naoya TABATA ^*2

Hajime SASANO ^*2

Hiroto MURAKAMI ^*3

^*1:Department of Science and Technology, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki, Japan

^*2:Department of Advanced Engineering, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki, Japan

^*3:Division of Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki, Japan

Nippon Gomu Kyokaishi,(2022),95(1),3-7 General Review in Japanese

A polyurethane (PU) crosslinked by a polyrotaxane (PRX), which consists of monoamino-α-cyclodextrin(amCyD) and poly(ethylene glycol)4000 (PEG4000), was designed to decrease the formation of multiple crosslinks from one CyD. The capping reaction of the pseudo-PRX containing amCyD was achieved by a click reaction. The filling ratio of amCyD in the PRX was ca. 74%. The PU crosslinked by the PRX(PU-PRXam(74)) was prepared by a prepolymer method. The thermal and physical properties of PU-PRXam(74) were compared with those of the PUs crosslinked by PRXs consisting of half-methylated CyD(PU-PRXMe(43) and PU-PRXMe(63)). The degree of swelling of PU-PRXam( 74) was ca. 1.3 times larger than those of PU-PRXMes, suggesting the decrease in the multiple crosslinks from one CyD. The DSC and dynamic viscoelastic measurements revealed that PU-PRXam(74) shows a unique relaxation after its glass transition. In the tensile test results, PU-PRXam(74) showed the best elongation among the PU-PRXs whereas the tensile strength was lower than the others. This result is also evidence of the decrease in the multiple crosslinks from one CyD.

(Received on November 1, 2021)

Keywords: Polyurethane, Polyrotaxane, Crosslink, Click Reaction