活性聚合与巯基-烯化学结合构造表面抗污材料

摘要

A functional chain transfer agent (Chain Transfer Agent,CTA) has been synthesized to control the polymerization of the hydrophilic monomer N,N-dimethyl acrylamide (DMA),forming a reactive homopolymer PDMA,which is further applied to control the polymerization of another bifunctional monomer allyl methacrylate (AMA).The excessive vinyl groups both in the resultant allyl-terminated polymer PDMA-PAMA and the vinyl-siloxane modified glass surface are easily to react with the multi-mercapto crosslinker through thiol-ene reaction.After some post thermal treatment,a PDMA modified hydrophilic glass surface has been obtained,whose surface contact angle behaves less small than that of blank glass surface,illustrating that the hydrophilic PDMA has been successfully grafted to the glass surface.This material surface modification method combines controllable RAFT technique and high efficient thiol-ene reaction,which provides a novel thread to fabricate anti-fouling materials with controllable and stable anti-fouling properties.%本文利用链转移试剂(Chain Transfer Agent,CTA)依次控制N,N-二甲基丙烯酰胺(DMA)、甲基丙烯酸烯丙基酯(AMA)进行可逆-加成链转移活性可控聚合反应(RAFT),得到末端带有活性双键的二嵌段聚合物聚N,N-二甲基丙烯酰胺-b-聚甲基丙烯酸烯丙基酯(PDMA-PAMA).该活性聚合物所含双键与乙烯基硅氧烷改性后的基体材料在适量的多巯基小分子促进下发生巯基-烯烃点击化学反应后接枝到基体材料表面.改性前后材料表面接触角测试表明,亲水性改性后的玻璃表面接触角明显小于未改性的玻璃表面,说明改性后的玻璃表面已接枝上亲水性基团,表面亲水获得改善.这种将RAFT与巯基-烯反应结合并应用于材料表面接枝改性的方法,可潜在应用于高端抗污涂层制备领域.