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时间:2020-04-05
《多支化聚乳酸的制备及其对聚乳酸结晶效果的影响.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、石油化工PETR0CHEMICALTECHN0LOGY·l205·2015年第44卷第10期多支化聚乳酸的制备及其对聚乳酸结晶效果的影响韩婷,辛忠,石尧麒,蒋晓峰,孟鑫,赵世成(1.上海市多相结构材料化学工程重点实验室华东理工大学化工学院,上海200237;2.化学工程联合国家重点实验室华东理工大学,上海200237;3.上海市聚烯烃催化技术重点实验室上海化工研究院,上海200062)[摘要]采用水解一缩聚两步法制备聚环氧基倍半硅氧烷微球(PESQ),以其为支化核心,通过辛酸亚锡催化丙交酯在熔融态开环形成支链制备多支化聚乳酸(m—PLLA),利用FTIR,HNMR,GPC等方法表
2、征m—PLLA的结构。表征结果表明,聚乳酸(PLA)成功接枝到PESQ上,且随丙交酯添加量的增加,m—PLLA先增加支链长度,后增加支链数目,最后支链长度和数目同时增加。考察了m—PLLA/(}z为成核剂对PLA结晶过程的影响。实验结果表明,添)J~I1.O%(W)的m—PLLA10时,PLA的冷结晶温度从121.2oC降至113.4oC,结晶度从15.7%升至31.1%,平均球晶直径从100gm细化至15p.m,优于添加等量滑石粉的PLA。[关键词]聚环氧基倍半硅氧烷;丙交酯;多支化聚乳酸;聚乳酸;成核剂;结晶[文章编号]1000—8144(2015)10—1205—07[中图
3、分类号]TQ317.3[文献标志码]APreparationofMulti-BranchedPoly(L-LacticAcid)asNucleatingAgentandItsEfectonCrystallizati0nofPoly(LacticAcid)HanTing,XinZhong2,ShiYaoqi一,JiangXiaofeng,MengXin,ZhaoShicheng(1.ShanghaiKeyLaboratoryofMultiphaseStructuralMaterialsChemicalEngineering,SchoolofChemicalEngineering,E
4、astChinaUniversityofScienceandTechnology,Shanghai200237China;2.StateKeyLaboratoryofChemicalEngineering,EastChinaUniversityofScienceandTechnology,Shanghai200237China;3.ShanghaiKeyLaboratoryofCatalysisTechnologyforPolyolefin,ShanghaiResearchInstituteofChemicalIndustry,Shanghai200062,China)lAbst
5、ractjPoly(epoxypropoxy)silsesquioxane(PESQ)particleswithreactivegroupswaspreparedthroughhydrolysis-po1ycondensation,andthenmulti—branchedpoly(L—lacticacid)(m—PLLA)waspreparedbymeltingring—openingoflactidewithPESQasthebranchingcoreandstannousoctanoateasthecatalyst.m—PLLAwascharacterizedbymeans
6、ofFTIR,HNMRandGPC.Theresultsshowedthatpoly(1acticacid)(PLA)wasgraftedtoPESQsuccessfully.Withincreasingthelactidedosage,thelengthofthebranchedchainsofm—PLLAfirstincreased,andthentheirnumberincreased.finallyboththelengthandthenumberincreasedatthesametime.Theefectsofm—PLLAasanucleatingagentonthe
7、crystallizationofPLAwereinvestigated.ComparedtoneatPLA,when1.0%(w)m—PLLA10wasadded,thecoldcrystallizationtemperatureofPLAdecreasedfrom121.2℃to113.4cI=.itscrystallinityincreasedfrom15.7%to31.1%.anditsaveragespherulitediameterdecreasedfrom100gm
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