PS-b-P(DMS-stat-VMS)嵌段聚合物的制备及性能

摘要

采用活性阴离子聚合方法, 以仲丁基锂为引发剂, 以苯乙烯、 六甲基环三硅氧烷(D3)和2,4,6-三乙烯基-2,4,6-三甲基环三硅氧烷(V3)为反应单体, 分步聚合制备了聚苯乙烯-b-聚(二甲基硅氧烷-stat-乙烯基甲基硅氧烷)[PS-b-P(DMS-stat-VMS)]嵌段聚合物.采用傅里叶变换红外光谱, 氢核磁共振谱及凝胶渗透色谱对共聚物的化学结构、 分子量及分子量分布进行了表征, 并通过扫描电子显微镜, 原子力显微镜及接触角等测试方法研究了共聚物各链段组分对共聚物形貌及表面亲疏水/油性的影响.结果表明, 所制备的共聚物分子量分布较窄, 由于各组分性能的差异而呈现出微相分离结构, 同时该共聚物保留了PS-b-PDMS原有的表面性质, 为设计结构多样性及性能优异的聚硅氧烷共聚物提供了新思路.%The active block copolymer polystyrene-block-poly(dimethylsiloxane-stat-vinylmethylsiloxane){[PS-b-P(DMS-stat-VMS)]} was prepared by reactive anionic polymerization, which was advantageous for {diverse} chemical modifications for broad practical applications.The chemical structure, molecular weight and morphology of as-prepared copolymer were characterized by FTIR, 1H NMR, GPC, FESEM and AFM.{Meanwhile,} the water/diiodomethane contact angle test was utilized to investigate the surface property of the product.The results indicated that the copolymer exhibited narrow molecular weight distribution of 1.37.Owing to the thermodynamic incompatibility between soft and hard domains, the copolymer film prepared by tape casting showed microphase separation structure, and the PDMS-PVMS soft domain was inclined to accumulate on the surface of the film.Moreover, the copolymer exhibited excellent hydrophobicity and low surface energy due to the surface enrichment of PDMS-PVMS soft domain.