脱膨潤ポリシロキサン網目の超高伸長特性

抄録

The high extensibility of deswollen polysiloxane (PDMS) network prepared at ca. 9% solution has been demonstrated. PDMS was crosslinked by hydrosilylation reaction of vinyl-terminated PDMS by tetrakisdimethylsiloxysilane in toluene. The fully deswollen network was obtained by removing toluene from the swollen PDMS network. The uniaxial elongation of the deswollen PDMS network prepared at 9% solution was carried out, and the elongation at break reached ca. 1700%. This high extensibility originates from the two main factors: no or negligible amount of trapped entanglements in the system due to the low preparation concentration of the prepolymer in toluene; the reduction of end-to-end distance of network chains on deswelling. The theoretical limit for the extensibility has been evaluated to be ca. 1900% by estimating the amount of trapped entanglements and the end-to-end distance of network chains at deswollen state. The theoretical value for the elongation at break explains well the extensibility obtained experimentally.