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时间:2020-03-27
《聚乳酸液态聚异丁烯共混物的研究.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、6第42卷,第12期工程担料应用Vo1.42.NO.122014年l2月ENG1NEERINGPLASTICSAPPI』CATIONDec.2014doi:lO.3969/j.issn.1001-3539.2014.12.002聚乳酸/液态聚异丁烯共混物的研究朱健,戚嵘嵘,洪玉琢,冯正明,李海波(上海交通大学化学化工学院,上海200240)摘要:为了改善聚乳酸fPLA)材料的脆性,且不影响其可降解性,选择了低分子量液态聚异丁烯(LPIB)和PLA进行共混改性,研究了LPIB用量对PLA/LPIB共混物性能的影响。结果表明,LPIB可提高PL
2、A的韧性,但降低了其拉伸强度,当LPIB质量分数为12%时,共混物的缺口冲击强度达到最高,为5.3kJ/m2,比纯PLA提高了近一倍;LPIB在PLA中起到异相成核的作用,可提高其结晶度采用扫描电子显微镜观察了共混物的微观形态,发现PLA与LPIB两相是分离的。为提高两者的相容性,采用缩水甘油酯(GMA)接枝LPIB(LPIB.g.GMA)作为增容剂,并研究了其用量对PLA/LPIB/LPIB.g.GMA共混物性能的影响。结果表明,LPIB.g.GMA对PLA/LPIB共混物有一定的增容作用,可使其相界面变得模糊,相容性有明显提高;"-3P
3、LA,LPIB与LPIB—g.GMA的质量比为88/2/10时,PLA/LPIB/LPIB.g:GMA共混物的缺口冲击强度和拉坤强度达到最大,与未加LPIB.g.GMA的共混物相比,分别提高了20.7%和13.8%;少量LPIB.g.GMA的加入会提高PLA/LPIB/LPIB.g.GMA共混物的结晶度,但其用量过高时。会降低共混物的结晶度。关键词:聚乳酸;液态聚异丁烯;增韧;相容性中图分类号:TQ325.1文献标识码:A文章编号:1001.3539(2014)12-0006-05StudyOfPOlylacticAcid/LiquidPo
4、lyisobuteneBlendsZhuJian,QiRongrong,Hong、Yuzhuo,FengZhengming,LiHaibo(SchoolofChemistryandChemicalEngineering,ShanghaiJiaoTongUniversity,Shanghai200240,China)Abstract:InordertoimprovethebrittlenessofPLAallddon’tafectitsbiodegradability,liquidpolyiosbutene(LPIB)wasusedasato
5、ughnessagentforbeingblendedwithPLA.TheeffectsofLPIBcontentonthepropertiesofPLA/LPIBblendswereinvestigated.TheresultsshowthatLPIBcanimprovethebritllenessofPLA.thenotchedimpactstrengthoftheblendwith12%LPIBisthebest,reachingto5.3kJ/m2,nearlytwiceasmuchaspurePLA.LPIBactsasahet
6、erogeneousnucleatingagentandcanimprovethecrystallizationofPLA.Scanningelectronmicroscopyindicatesthattwophases(PLAandLPIB)areseparated.ToimprovethecompatibilitybetweenPLAandLPIB,theglycidylmethacrylategraftedLPIB(LPIB-g-GMA)wasusedascompatilizer,andtheefectsofLPIB—g·GMAcon
7、tentontheperformanceofthePLA/LPIB/LPIB-g-GMAblendswereinvestigated.TheresultsshowthatLPIB.g.GMAcanimprovethecompatibilitybetweenPLAandLPIB.maketheinterfacebetweenPLAandLPIBbecomevague。whichindicatesthatthecompatibilityisimproved.WhenthemassratioofthePLA/LPIB/LPIB—g-GMAis88
8、/2/10,thenotchedimpactstrengthandtensilestrengthofPLA/LPIB/LPIB·g—GMAblendscanreachmaximu
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