PSt—b—PAA的ATRP法合成及其在甲苯中自组装.docxVIP

PSt—b—PAA的ATRP法合成及其在甲苯中自组装2006年第27卷第3期中北大学(自然科学版)Vo1.27No.32006 (总第107期)JOURNALOFNORTHUNIVERSITYOFCHINA(NATURALSCIENCEEDITION)(SumNo.107)文章编号:1673—3193(2006)03—0234—06 PSt—b—PAA的ATRP法合成及其在甲苯中自组装汤志忠,高保娇,何三雄 (中北大学化学工程系,山西太原030051)摘要:以a.溴乙苯为引发剂,溴化亚铜为催化剂,2,2’-联吡啶为配体,二甲苯为溶剂,采用开放的溶液聚合体系,在磁力搅拌与氮气保护下,用原子转移自由基聚合ATRP(AtomTransferRadical Polymerization)法合成了嵌段共聚物聚苯乙烯.b.聚丙烯酸丁酯(PSt—b.PBA);用FTIR,H.NMR,GPC等手段对活性聚合进行了确认,对嵌段共聚物进行了表征;水解PSt—b—PBA制备了两亲性嵌段共聚物苯乙烯 b一聚丙烯酸(PSt.b.PAA);采用直接溶解法配制了PSt—b.PAA在甲苯中的反胶柬溶液;利用透射电镜 (TEM)观察有效地考察丁两亲嵌段共聚物PSt—b—PAA在甲苯溶液中的自组装行为.研究结果表明,在开放体系下也能较好地实施原子转移自由基聚合,制得窄分布的嵌段共聚物;控制两嵌段的长度可制得亲水链 PAA短的两亲嵌段共聚物PSt—b.PAA.使其在甲苯中发生自组装,形成以亲水段为核,疏水段为壳的反胶柬结构.关键词:原子转移自由基聚合;两亲嵌段共聚物;苯乙烯;丙烯酸;自组装;反胶柬中图分类号:O631.2文献标识码:A SynthesisofPSt-b—PAAbyATRPApproachand ItsSelf—AssemblingBehaviorinToluene TANGZhi—zhong,GAOBao—jiao,HESan—xiong (Dept.ofChemicalEngineering,NorthUniversityofChina.Taiyuan030051.China) Abstract:TheblockcopolymarofPSt—b—PBAwithalowpolydispersityhasbeensynthesizedbyatom transferradicalpolymerization(ATRP)inopensolutionpolymerizationsystemusing1一phenylethylbro. mide(1一PEBr)asinitiator,cuprousbromideascatalyst,2,2一bipyridine(bpy)asligandandxyleneas solvent.Thepolymerizationisconductedusinganelectromagnetismagitatorundertheprotectionofni— trogenatmosphere.AfterthecharacterizationoftheblockcopolymerPSt—b-PBAandthevalidationof thelivingpolymerizationbyGPC,FTIR,andH—NMR,amphiphilicblockcopolymerofPSt—b—PAAhas beenpreparedbyhydrolyzingofPSt—b—PBA.ThereversedmicellizationsolutionofPSt—b—PAAin toluenehasbeenpreparedbydirectlydissolvingmethod,andinvestigatedbyTEMobservationmean. ResearchresultsshowthattheATRPpolymerizationcanalsoberealizedwellinopensystem,andam. phiphilicblockcopolymerofPSt—b—PAAwithshorterPAAsegmentandalowpolydispersitycanbeob. tainedbycontrollingpolymerizationtime.Thereversedmicellswithhydrophiliccoreandhydrophobic shellcanbeformedbyspontaneouslyself—assemblingofPSt.b—PAAintoluene. Keywords:atomtransferradicalpolymerization;amphiphilicblockcopolymer;styrene;acryl