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时间:2019-09-10
《新型聚烯烃弹性体OBC增韧共聚PP的研究》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、万方数据第23卷第5期2009年10月高校化学工程学报JournalofChemicalEngineeringofChineseUniversitiesNO.5、,01.230Ct.2009文章编号:1003-9015(2009)05-0813·06新型聚烯烃弹性体OBC增韧共聚PP的研究李晨,范宏,鲁列,郭春文,李伯耿(浙江大学化学工程与生物工程学系化学工程国家重点实验室,浙江杭州310027)摘要:进行乙烯.辛烯嵌段型共聚物(OBC)共混改性共聚级聚丙烯(Co-PP)的研究,考察了共混物的冲击强度、拉伸强度、断裂伸长率、熔体流动指数、维卡软化点等机械物理性能和冲击
2、断面形貌,进行了动态力学分析,并与Co-PP/乙烯.辛烯无规共聚物(POE)、Co-PP/7,烯.丁烯共聚物(EBC)共混体系比较。结果表明,弹性体含量达到10%(wt)时,三种共混体系均已基本实现“脆韧转变”,含较长支链的OBC与POE对Co-PP有更好的增韧效果;低温下,Co-PP/OBC的抗冲性能尤佳,其低温内耗峰温度低、储能模量高。OBC大分子链中PE嵌段的存在,使其自身及其与Co-PP共混物的加工与耐热性均明显优于其它两种弹性体。关键词:共聚级聚丙烯:聚烯烃弹性体;增韧改性;乙烯.辛烯嵌段型共聚物中图分类号:TQ325.14文献标识码:AResearchon
3、TougheningModificationofCopolymerizedPolypropyleneUsingPolyolefinElastomersLIChen,FANHong,LULie,GUOChun-wen,LIBo-geng(StateKeyLaboratoryofChemicalEngineering,DepartmentofChemicalandBiochemicalEngineering,ZhejiangUniversity,Hangzhou310027,China)Abstract:Comparedwiththepolyolefinelastomer
4、sofethylene-octenerandomcopolymer(POE)andethylene-butenerandomcopolymerfEBC),anewpolyolefinelastomer,ethylene-octeneblockcopolymer(OBC),wasusedtoblendwithcopolymerizedpolypropylene(Co-PP)andtoformthetougheningmodifiedCo—PPalloy.Themechanicalandphysicalpropertiesofthetougheningmodifiedal
5、loys,suchasimpactsUength,tensilestrength,elongationatbreak,meltflowindex,Vicatsofteningpointandmorphologiesoftheimpactfracturesurface,wereinvestigated.Thedynamicmechanicsofthealloyswereanalyzedtoo.TheresulBshowthatallthethreekindsofCo.PPalloys(Co.PP/OBC。Co-PP/POEandCo-PP/EBC)havealmosta
6、ccomplishedthe“brittle.ductiletransition'’whentheirelastomercontentishigherthanlO%(wt),andboththeethylene-octenecopolymers(OBCandPOE)withlongerbranchedchainshavebettertougheningeffectonCo-PPEspeciallyatlowtemperatures,tIleCo-PP/OBCalloyhashigherimpactstrength,storagemodulusandlowerlossp
7、eaktemperature.SincethereispolyethyieneblocksexistinginthechainsofOBC,bothOBCanditsalloywithCo·PPhavebetterprocessabilityandhigherthermaldeformationtemperature.Keywords:Co-polypropylene;polyolefinelastomer;tougheningmodification;ethylene-octeneblockcopolymerl前言聚丙烯(PP)原料来源丰富,合成工
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