成核剂对聚对苯二甲酸乙二醇酯的结晶行为影响_张广成.doc

------------------------------------------------------------------------------------------------ —————————————————————————————————————— 成核剂对聚对苯二甲酸乙二醇酯的结晶行为影响_张广成 DOI牶牨牥牣牨牫牬牫牫牤j牣cnki牣牨牥牥牫牠牳牱牪牳牣牪牥牥牰牣牥牰牣牥牥牬第25卷第6期机械科学与技术2006年6月MECHANICALSCIENCEANDTECHNOLOGY Vo.l25 JuneNo.62006 文章编号:1003-8728(2006)06-0641-06 成核剂对聚对苯二甲酸乙二醇酯的结晶行为影响 张广成,史学涛,项士新,刘铁民,陈　挺,顾军渭 (西北工业大学理学院应用化学系,西安　710072) 张广成 摘　要:在HAAKE转矩流变仪中进行了聚对苯二甲酸乙二醇酯(PET)和不同类型成核剂的熔融共混,采用差示扫描量热仪(DSC)研究了不同粘度纯PET、纯PBT及添加小分子成核剂、高分子成核剂、复合成核剂的PET非等温结 晶过程。通过红外光谱(FTIR)、热台偏光显微镜(POM)和扫描电镜(SEM)对添加成核剂前后PET的结晶形貌进行对比分析。结果表明低粘度PET的结晶能力较中粘度和高粘度的PET结晶能力强,添加成核剂后PET的结晶峰温移向高温、半结晶时间缩短、结晶速率常数增大。其中高分子成核剂、复合成核剂对PET结晶行为改善效果更好,其成核机理为化学成核,但高分子成核剂不会造成PET分子链的降解。关　键　词:PET;结晶;特性粘度;成核剂;DSC;化学成核中图分类号:TB322 文献标识码:A InfluenceofNucleationAgentsontheCrystallizationBehaviorofPET ZhangGuangcheng,ShiXuetao,XiangShixin,LiuTiemin,ChenTing,GuJunwei(DepartmentofAppliedChemistry,NorthwesternPolytechnicalUniversity,Xi′an710072)Abstract:PETandnucleationagentsofvarioustypeswereblendedinaHAAKErheometer.Thenon-iso-thermalcrystallizationbehaviorofpolyethylene-terethalate(PET)ofdifferentintrinsicviscosities,purepolybutylene-terethalate(PBT),PETaddedwithsmallmoleculenucleationagents,highmolecularnucle-ationagentsandmultiplexnucleationagentswerestudiedbyusingdiffentialscanningcalorimeter(DSC).ThemorphologyofPETandPETaddedwithnucleationagentswerecomparedbyusingFouriertransforma-tioninfaredspectroscopy(FTIR)、polarizationmicroscopeHAAKErheometer(POM)andscanelectronmicroscopy(SEM).ThestudyindicatesPEToflowintrinsicviscosityhasabettercrystallizationbehaviorthanthatofmiddleintrinsicviscosityandhighintrinsicviscosity.Addedwithnucleationagents,thePEThasthefollowingchanges:crystalizationpeaktemperaturebecomeshigher;thehalfcrystallizationtimeisshorter;theconstantcrystalizationrateincreases.Macromoleculenucleationagentsandmultiplexne-cleationagentsimprovePETcrystallizationbehaviorgreatly,andtheirnucleationmechanismischemicalnucleation,