光引发聚合诱导自组装制备二嵌段共聚物组装体

Synthesis of Diblock Copolymer Assemblies Via Photoinitiated Polymerization-induced Self Assembly

以N,N-二甲基丙烯酰胺(DMA)为单体,2-甲基-2-(十二烷基三硫代碳酸酯基)丙酸(DDMAT)为链转移剂,通过可逆加成-断裂链转移(RAFT)聚合合成大分子RAFT试剂PDMA-DDMAT。再以N-异丙基丙烯酰胺(NIPAM)为成核单体,N-烯丙基丙烯酰胺(ALAM)为原位交联剂,通过光引发聚合诱导自组装制备具有不同形貌的交联二嵌段共聚物组装体。结果表明,组装体的形貌受大分子RAFT试剂分子量、第二嵌段聚合度、反应温度、固含量及原位交联剂使用量的影响。

Reversible addition-fragmentation chain transfer(RAFT) polymerization was employed to synthesize poly(N,N-dimethylacetamide)(PDMA)-based macro-RAFT agents using 2-methyl-2-(dodecyl trithiocarbonate) propionic acid(DDMAT) as the RAFT agent. The obtained PDMA-DDMAT macro-RAFT agents were employed in photoinitiated polymerization-induced self-assembly to prepare cross-linked block copolymer assemblies with various morphologies using N-isopropyl acrylamide(NIPAM) as the core-forming monomer and N-allyl acrylamide(ALAM) as the cross-linker. It was found that the molar mass of macro-RAFT agent, degree of polymerization, reaction temperature, solids content and the amount of cross-linker had significant effects on morphologies of block copolymer assemblies.