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时间:2020-03-26
《固化UP的去交联化及其醇解和水解产物的结构分析.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、第42卷,第7期工程塑料应用Vo1.42,No..,20l4年7月ENGINEER1NGPLASTICSAPPLICAT10NJu1.20l4固化UP的去交联化及其醇解和水解产物的结构分析古王聪彩,郭睿威,黄一烽,张建华(天津大学化工学院,天津3000721摘要:以Ⅳ_甲基吡咯烷酮(NMP)为溶剂,一缩二乙二醇(DEG)为醇解剂,在两者质量比为5:8且回流温度为210~230~C的条件下,经适量NaOH催化,可有效地使不同苯乙烯(st)含量的不饱和聚酯树脂(uP)固化物去交联化,从而得到了固化up的醇解产物。对醇解
2、产物进一步水解,得到了反映uP交联网链结构信息的s卜富马酸线性共聚物,并采用NMR技术测定了其组成和序列结构,从而获得了不同st含量的固化UP中交联网链的结构特性,即随着St含量增加,St与uP中富马酸酯的共聚倾向于无规共聚,且st段交联网链的平均序列长度增加,表明固化UP的交联密度下降。这些研究结果为通过调节uP中st的含量来调控其固化物的力学性能和热稳定性提供了参考。关键词:不饱和聚酯;去交联化;序列结构;醇解中图分类号:TQ323.4文献标识码:A文章编号:1001.3539(2014)07.0077.05D
3、e-crosslinkingofCuredUPandStructureAnalysisofItsAlcoholysisandHydrolysisProductsWangCongcai,GuoRuiwei,HuangYi~ng,ZhangJianhua(SchoolofChemicalEngineeringandTechnology,TianjinUniversity,Tianjin300072,China)Abstract:Takingdiethyleneglycol(DEG)asalcoholysisagenta
4、ndN-methylpyrrolidone(NMP)assolvent,threecuredunsaturatedpolyester(UP)withdiferentstyrenecontentwerede—crosslinkedefectivelyunderthecatalysisofNaOHwhenthemassratioofNMPandDEGwas5:8andtherefluxtemperaturewas210—230℃andtheresultantalcoholysisproductsweregained.T
5、henthelinearstyrene-fumaratecopolymerswhichcanreflectcrosslinkingnetworkstructureinformationofthecuredUPwereobtainedafterthehydrolysisofthealcoholysisproducts.ThecompositionandsequencestructureofthecopolymerswerecharacterizedbyNMRandthecrosslinkingnetworkstruc
6、turecharacteristicofthecuredUPwithdifferentstyrenecontentwasobtained.Itisthatwiththeincreaseofstyrenecontent,thecopolymerizationofstyreneandfumarateinthecuringprocessofUPtendstoformrandomcopolymers,inaddition,theaveragesequencelengthofpolystyrenesegmentsinthec
7、rosslinkingnetworkofthecuredUPincreaseswhichindicatesthecrosslinkingdensityofthecuredUPdecreases.TheseresultsprovidereferencesforcontrollingmechanicalpropertiesandthermalstabilityofthecuredUPthroughchangingthestyrenecontent.Keywords:unsaturatedpolyester;de—cro
8、sslink;sequencestructure;alcoholysis不饱和聚酯树脂(UP)作为普遍使用的多元化方法l6]。然而UP固化后,uP与交联单体中的双键热固性树脂之一,是由饱和二元酸、不饱和二元酸和聚合形成不溶不熔的三维交联网络,不但结构非常二元醇缩聚而成的线形聚合物。固化uP具有优良复杂,而且难以被检测研究。为了研究UP交联网的力学性能、电性能
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