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时间:2020-03-27
《盐对刷型两亲聚合物聚集行为的调控作用.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学报(WuliHuaxueXuebao)FebruaryActaPhys.一Chim..2013,29(2),341-34534l[Article】doi:10.3866/PKU.WHXB201211262www.whxb.pku.edu.cn盐对刷型两亲聚合物聚集行为的调控作用吴旭蔡晓新’王金本杨惠史学峰(Y-,}ll大学化学化工学院,广州510006;中国科学院化学研究所,胶体、界面与化学热力学重点实验室,北京100190)摘要:两亲聚合物奇异的功能特性源于分子独特的骨架结构和在溶液中的自组装聚集行为.本文向以2.丙
2、烯酰胺基一十二烷基磺酸(AMC,S)与2.丙烯酰胺基-2一甲基丙磺酸(AMPS)进行无规共聚所制备的AMPS-AMC,。S刷型两亲聚合物溶液体系中引入不同用量的NaCI,采用稳态荧光、动态光散射(DLS)和透射电子显微镜(TEM)系统考察NaCI对聚合物聚集行为的调控作用.研究发现,聚合物结构中疏水侧链含量越低,NaCI对聚集行为的调控作用越强:NaCI浓度增加会明显降低聚合物的临界聚集浓度:与此同时,聚合物分子链自组装由分子间的聚集方式向分子内的聚集方式转变,形成的聚集形态由大型多分子聚集体变化为尺寸数百分之一的单聚体.关键词
3、:聚集行为:NaCI;聚集体:刷型聚合物:调控中图分类号:0648SaltEfectonControllingAggregationBehaviorofBrush-LikeAmphiphilicPolymersWUXu’’CAIXiao—Xin’WANGJin—BenYANGHuiSHIXue—FengrCollegeofChemistryandChemicalEngineering,GuangzhouUniversity,Guangzhou51000~PR.China;2KeyLaboratoryofC0lioid,Inter
4、faceandChemicalThermodynamics,InstituteofChemistry,ChineseAcademyofSciencesBeijing10019~PR.China)Abstract:TheextraordinarypropertiesofamphiphilicpolymersoriginatefrOmtheiruniqueskeletonstructuresandtheaggregationbehaviorofthepolymerchains.1nthepresentwork.weintroduce
5、ddiferentamountsofNaCIjntoAMPS-AMC12Sbrush-likeamphiphilicpolymerssynthesizedv/athestatisticalpolymerizationof2.(acrylamido).dodecanesulfonicacid(AMC12S)with2-(acrylamido)一2-methylpropanesulfonicacid(AMPS),andinvestigatedtheefectsoftheNaCIontheaggregationbehaviorofth
6、epolymers,usingsteady—statefluorescence,dynamiclightsca~ering,andtransmissionelectronmicroscopy.Theresultsshowedthattheefectsofthesaltweremoreintenseforpolymerswithfewersidechains.AstheNaClconcentrationincreased.thepolymerchainsassociatedatalowercriticalconcentration
7、.Thepolymerstendedtoaggregateinanintrapolymerconfiguration,inpreferencetoaninterpolymerconfiguration;thisresultedintheformationofsmallerunimers,ratherthangiantmultipolymeraggregates.Theresultsdescribedhereprovideanefficientapproachforcontrollingtheaggregationbehavior
8、ofamphiphilicpolymers.andhavesignificanceinadvancingthedesignandcontroloffunctionaIaqueoussystems.aswelIasinpromotingthedevelopment
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