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用羟丙基纤维素(HPC)接枝的多链转移官能基大分子链转移剂,通过可逆加成断裂链转移(RAFT)聚合制备了羟丙基纤维素接枝聚(N-异丙基丙烯酰胺)(PNIPAM)水凝胶(HPC-g-PNIPAM hydrogel),研究了HPC相对分子质量、RAFT分子接枝密度以及HPC和NIPAM质量比对水凝胶微观形貌、低临界溶解温度(LCST)以及溶胀性能和机械性能的影响。结果表明,HPC大分子RAFT聚合PNIPAM能获得具有高溶胀比和快速响应性能的水凝胶;HPC的引入能提高水凝胶机械强度。RAFT聚合方法和少量大分子纤维素RAFT分子的引入会略微降低LCST,但当HPC组分增加到一定量,又会使LCST升高。
Hydroxypropylcellulose grafted poly (N-isopropyl) acrylate was prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization using multi-chain transfer functional macromolecular chain transfer agent grafted with hydroxypropyl cellulose (HPC) (HPC-g-PNIPAM hydrogel), the relative molecular mass of HPC, the graft density of RAFT and the mass ratio of HPC to NIPAM were investigated to evaluate the effect of HPC-g-PNIPAM hydrogel on the morphology, ) As well as swelling and mechanical properties. The results showed that HPC macromolecule RAFT polymerization PNIPAM can obtain hydrogel with high swelling ratio and fast response properties; HPC can improve the hydrogel mechanical strength. The introduction of RAFT and a small amount of macromolecule cellulose RAFT slightly decreases the LCST, but when the HPC fraction increases to a certain amount, the LCST increases again.