无皂乳液聚合法制备亚微米级单分散聚苯乙烯微球.pdf

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1、l6第41卷，第3期工程塑料应用VOl_41．No．32013年3月ENGINEERINGPLASTICSAPPLICATIONMat．20l3doi：lO．3969~．issn．1001-3539．2013．03．003无皂乳液聚合法制备亚微米级单分散聚苯乙烯微球李玉，孟秀红，马骏，王海彦[1．辽宁石油化工大学，辽宁抚顺113001；2．中国石油大学(华东)，山东青岛266580]摘要：采用无皂乳液聚合法制备了亚微米级聚苯乙烯(Ps)微球，考察了苯乙烯(st)单体浓度、引发剂过硫酸钾(K，s0)浓度、离子强度(氯化钠浓度)与Ps微球粒径及其分布的关系。然

2、后通过加入微量乳化剂或环糊精对无皂乳液聚合法进行改进，研究了改进效果。结果表明，PS微球的粒径随st单体浓度和氯化钠浓度的增加而增加、随K，SO浓度的增加而减小，通过调节这3种原料的浓度，可制得粒径在450～1000am且单分散系数小于0．08的PS微球，但产品收率较低，仅为30％左右。在相同的合成条件下，加入微量乳化剂可制得粒径在100～350am且单分散系数小于0．05的PS微球，产品收率提高到75％左右；加入微量环糊精可制得粒径在300am左右且单分散系数小于0．08的PS微球，产品收率可达80％且反应时间大幅缩短，由原来的12h缩减到5h。关键词：

3、无皂乳液聚合；亚微米聚苯乙烯微球；乳化剂；．环糊精中图分类号：TQ325．2文献标识码：A文章编号：1001．3539(2013)03．0016．05PreparationofSub-micronMonodispersePolystyreneMicrospheresbySoap·-FreeEmulsionPolymerizationLiYu，MengXiuhong，MaJun，WangHaiyan(1．LiaoningShihuaUniversity，Fushun113001，China；2．ChinaUniversityofPetroleum，Qingd

4、ao266580，China)Abstract：Sub—micronpolystyrene(PS)microspheresweresynthesizedbysoap—freeemulsionpolymerization．Effectsofstyrene(St)monomer’Sconcentration，potassiumpersulfate(K2S2O8)initiator'Sconcentrationandionicstrength(concentrationofsodiumchloride)onparticlediameteranddistribut

5、ionofthePSmicrosphereswerestudied．Thensoap-freeemulsionpolymerizationwasimprovedthroughaddingasmallamountofemulsifyingagentor-cyclodextrinandtheimprovingefectswerestudiedalso．TheresultsshowthattheparticlediameterofPSincreaseswimconcentrationsofStmonomerandsodiumchlorideincreasing．

6、decreaseswithconcentrationofK2S2O8decreasing．ThePSmicrosphereswithparticlediameterbeingwithin45o_1000amandmonodispersecoeficientbeinglessthan0．08canbeobtainedbyadjustingtheconcentrationsofthreerawmaterialsmentionedabove．buttheproductyieldislowandthevalueisonlyabout30％．Underthesame

7、synthesisconditions，thePSmicrosphereswithparticlediameterbeingwithin100—350nmandmonodispersecoeficientbeinglessthan0．05canbeobtainedbyaddingemulsifyingagent．theproductyieldisimprovedtoabout75％．ThePSmicrosphereswithparticlediameterbeingabout300amandmonodispersecoeficientbeinglessth

8、an0．08canbeobtainedbyaddingfl-cyc