多官能/二官能化合物の付加反応と多官能エポキシ化合物の開環重合によるIPNゲルの合成と力学的特性解析

摘要

有機溶媒中での多官能化合物とその間を繋ぐ二官能化合物との付加反応で形成される1stネットワークと，エーテル連鎖を有する二官能エポキシ化合物の開環重合で形成される2ndネットワークとを組合せて，1PNゲルを合成した.1stネットワークには，四官能ビニルシロキサンとアルキルジチオールあるいは多官能チオール化合物と PEGジァクリレートとのチォールーェン反応を用いて，2nd ネットワークにはPEGジグリシジルエーテルの開環重合を用いた.IPNゲル化により破断強度と破断ひずみが向上した.また，ヒマシ油ーキサメチレンジイソシァネート/ェポキシ化大豆油（ESO)反応系を用いたIPNゲルの合成も検討した.本系では，ネットワークの組成比だけでなく， ネットワークの形成順もIPNゲルの力学的特性に影響を及ぼすことが明らかになった.%Interpenetrating polymer network (IPN) gels have been synthesized by combination of networks formed by thiol-ene reaction of multitunctional compounds with bifunctional compounds (1st network) and ring opening polymerization of poly(ethylene glycol) diglycidylether (PEGDE) (2nd network). The 1st network was formed by thiol-ene click reaction of a multi-functional vinyl siloxane, (1,3,5,7-tetramethylcyclotetrasiloxane, TVMCTS) and an alkyl dithiol, (1,10-decane dithiol, DDT) in toluene. The mechanical properties of the IPN gels were investigated by compression tests. The IPN gels showed a higher breaking stress and breaking point than the single network gel. The 1st network has been also synthesized by the thiol-ene reaction of multi-functional thiol compounds and poly (ethylene glycol) diacrylate in some organic solvents (toluene, tetrahydrofuran). These IPN gels also showed higher breaking stress and breaking point in comparison with the corresponding single network gels. The IPN gels with PTMB showed higher Young's modulus due to the physical entanglement between the 1st and 2nd networks. The reaction system of caster oil-hexamethylene diisocyanate (HDI)/epoxized soybean oil (ESO) was also usable to synthesize IPN gels. The 1st and 2nd networks were formed by the addition reaction of caster oil and HDI and ring opening polymerization of ESO, respectively. The composition ratio and formation order of the 1st and 2nd network affected the mechanical properties of the resulting IPN gels.