X型与线型嵌段聚醚在空气,水和正庚烷,水界面上聚集行为的比较研究.pdf

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1、物理化学学~(WuliHuaxueXuebao)lO2Acta尸．一Chim．Sin．2014，30(1)，102-110January【Article】doi：10．3866／PKU．WHXB201311071w、w．whxb．pku．edu．cnX型与线型嵌段聚醚在空气，水和正庚烷，水界面上聚集行为的比较研究陈贻建刘腾翟雪如徐桂英(山东大学胶体与界面化学教育部重点实验室，济南250100)摘要：通过阴离子聚合方法合成了环氧乙烷(EO)含量和分子量均相同的线型聚氧丙烯(PEO)一聚氧乙烯(PPO)(LPE)和X型聚氧丙烯-聚氧乙烯(TPE)嵌段聚醚，考察了它们在空气／水及正庚烷

2、／水界面上聚集行为的差异．界面活性的研究结果表明。TPE降低水、正庚烷界面张力的效率和效能均低于LPE的．聚醚分子在正庚烷，水界面达到吸附平衡的时间比在空气，水表面短．由于正庚烷分子插入到聚醚吸附层中，聚醚分子可以在正庚烷，水界面上采取更为直立的状态，因此聚醚分子在正庚烷，水界面扩散较快．聚醚在正庚烷，水界面的扩张弹性高于空气／水表面的．关键词：X型嵌段聚醚：界面活性：界面扩张粘弹性：界面聚集行为中图分类号：O641ComparativeStudyontheAggregationBehaviorsofX—ShapedandLinearBlockPolyethersattheAir

3、／Waterandn-Heptane／WaterInterfacesCHENYi—JianLIUTengZHAIXue—RuXUGui-Ying(KeyLaboratoryofColloidandInterfaceChemistry,MinistryofEducation，ShandongUniversity,Jinan25010~R．China)Abstract：Linearblockpolyethers，i．e．，poly(ethyleneoxide)(PEO)-poly(propyleneoxide)(PPO)一PEO(LPE)，andX-shapedblockpolyet

4、hers，i．e．，PEO．PPO．PEO(TPE)，withsameEO／POratiosandmolecularmassesweresynthesizedbyanionicpolymerization．Theaggregationbehaviorsatair／waterand门-hep—tahe／waterinterfacesweresystematicallystudied．TheresultsshowthatLPEiSmoreefficientatdecreas—ingthesurfacetensionofwaterandn．heptanethanTPEiS．Thedyn

5、amicinterfaciaItensioncuwesindicatethattheIag-timeoftheadsorptionoftheblockpolyethersatthen-heptane／waterinterfaceissmallerthanthatattheair／watersurface，implyingthatimmersionofthePOgroupsintheoilphaseismoreenergeticallyfavorablethanimmersionintheairphase．Theoilmoleculescaninserlintotheadsorpt

6、ionIayer,andhydro-phobicinteractionsbetweenoilmoleculesandPOmoietiesleadtoarelativelyorderedarrangementofad—sorbedpolyethermolecules．Atthen．heptane／waterinterface．difusionoftheblockpolyethersiSfasterthanthatattheair／waterSUrface．ThedilatationaIelasticityatthen．heptane／waterinterfaceiSmuchhigh

7、erthanthatattheair／watersurface．KeyWords：X-shapedblockpolyether；Interfacialactivity；InterfacialdilationalviscoelasticityInterfacialaggregationbehavior1引言面活性剂，其分子有着丰富的可设计性，如分子量、PEO．PPO嵌段聚醚是一类非离子型高分子表EO和PO含量及其比例、嵌段顺序和支化程度等Received：Julyl1，2013；R