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时间:2020-03-23
《离聚物Surlyn8920对PET/PBT合金结晶性能的影响.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、塑料工业第42卷第1期·34·CHINAPLASTICSINDUSTRY2014年1月离聚物Surlyn8920对PET/PBT合金结晶性能的影响王瑞元,陈晓东,徐群杰,付杰辉。(1.上海电力学院环境与化学工程学院,上海200090;2.上海日之升新技术发展有限公司,上海201109)摘要:采用差示扫描量热仪和扫描电镜研究了离聚物Surlyn8920对聚对苯二甲酸乙二醇酯(PET)/聚对苯二甲酸丁二醇酯(PBT)合金结晶性能的影响。结果表明,Jeziorny法和Kissinger法可以较好地模拟共混合金的非等温结晶过程。Surlyn8920在高温下可
2、与PET、PBT发生反应,起到了异相成核的作用。它不但降低了分子链扩散进入晶格的自由能,也提高了体系的结晶速率,PBT的存在则加速了这种效应。当Surlyn8920的用量逐渐增大时,反应形成的离子簇自聚集能力逐渐减弱,有效的成核中心逐渐饱和,体系的结晶速率不再加快,反而减慢。Surlyn8920可以弥补PBT改性带来的缺陷,当其用量为3%时,其成核效果最好。与纯PET/PBT合金相比,体系的半结晶时间缩短,结晶温度升高,结晶焓增大,结晶活化能降低。关键词:聚对苯二甲酸乙二醇酯;聚对苯二甲酸丁二醇酯;Surlyn8920;非等温结晶;离子簇DOI:10
3、.3969/j.issn.1005—5770.2014.01.009中图分类号:TQ323.41文献标识码:A文章编号:1005—5770(2014)01—0034—05EffectsofIonomerSurlyn8920onCrystallizationPropertiesofPET/PBTAlloyWANGRui—yuan,CHENXiao—dong,XUQun-jie,FUJie—hui(1.CollegeofEnvironmentalandChemicalEngineering,ShanghaiUniversityofElectricPowe
4、r,Shanghai200090,China;2.ShanghaiSunnyNewTechnologyDevelopmentCo.Ltd.,Shanghai201109,China)Abstract:TheeffectsofionomerSurlyn8920oncrystallizationpropertiesofPET/PBTAlloyswerestudiedbydifferentialscanningcalorimeterandscanningelectronmicroscope.TheresultsshowedthattheJeziornyme
5、thodandKissingermethodcansimulatethenon。isothermalcrystallizationprocessofthealloywel1.Surlyn8920canreactwithPETandPBTathightemperature,whichplayedaroleofheterogeneousnucleatingagent.Itnotonlyreducedthefreeenergyofdiffusionintothecrystallatticeforthemolecularchain,butalsoincrea
6、sedthecrystallizationrateofthesystem,andtheexistenceofPBTacceleratedthiseffect.WhenthecontentofSurlyn8920increasedgradually,theself-aggregationabilityofionclusterswhichformedinthereactionweaken,andtheeffectivenucleationcentergraduallysaturated,thecrystallizationratenolongerspee
7、dup,insteadsloweddown.Surlyn8920canmakeupforthedefectofPBTinmodificationonPET,whenitscontentwas3wt%,theeffectofnucleationwasthebest.ComparedwithpurePET/PBTalloy,thehalfcrystallizationtimeofthesystemwasshortened,thecrystallizationtemperaturerose,thecrystallizationenthalpyincreas
8、ed,andthecrystallizationactivationenergyreduced.Keywor
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