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1、西南科技大學碩士研究生學位論文第1頁摘要采用“一步擠出法”制備了高密度聚乙烯/聚對苯二甲酸乙二醇酯(HDPE/PET)增容共混物。通過傅利葉紅外光譜(FTIR)分析證明了接枝聚合物HDPE.g.GMA的形成。考察了引發(fā)齊tJDCP含量對增容效果的影響,單體GMA對增容效果的影響,原位微纖化方法對增容共混物性能的影響,熱拉伸比(HSR)對增容共混物性能的影響。主要研究結果如下:1)通過掃描電鏡(SEM)、示差掃描量熱(DSC-)、力學性能、動態(tài)力學分析(DMA)、動態(tài)流變分析(DRA)和維卡軟化點(VSP)等表征發(fā)現(xiàn),引發(fā)劑DCP含量對共混物增容效果
2、影響較大,增容效果隨DCP含量增加而增加。當DCP含量為0.25phr時增容效果最好,但達No.30phr時增容效果不再明顯,并開始下降。2)通過力學性能和VSP等表征發(fā)現(xiàn),單體GMA含量對共混物增容效果影響不大。當GMA含量由O.25phr增加至1.00phr時,體系增容效果逐漸變差,但變化幅度很小。3)“熔融擠出.熱拉伸.淬冷"工藝制備了原位微纖化共混物,SEM表明PET在體系中形成了良好的微纖形態(tài);力學性能、DSC、DMA、DRA和VSP等表征發(fā)現(xiàn),原位微纖化方法提高了共混物的拉伸強度、降低了沖擊強度,影響了HDPE的結晶速度,降低了增容共混
3、物的儲能模量,提高了增容共混物的損耗因子、彈性模量和粘性模量,提高了VSP。4)通過力學性能和VSP等表征發(fā)現(xiàn),共混物拉伸強度和VSP均隨HSR的增加而升高,當HSR達到4.7后又略有下降,沖擊強度則恰好相反。黼:高嫩Z粕PE)聚對苯二甲酸乙二醇酯(PET)反應增容原位微纖化共混物力學性能西南科技大學碩士研究生學位論文第1I頁AbstractInthispaper,compatibilizedHDPE/PETblendwaspreparedthroughone·stepextrusion.TheformationofgraftedpolymerHD
4、PE-g-GMAwasdeterminedbyFTIRspectrum.TheeffectofinitiatorDCPcontentandmonomerGMAcontentoncompatibilizationwasinvestigated.TheeffortofinsitumicrofibrillarmethodandHSRoncompatibilizedblendpropertieswasstudied.nemainresultshavebeenpresentedasfollows:1)ThecharacterizationssuchasSEM
5、,DSC,mechanicalpropertiestesting,DMA,DRAandVSPwereemployed.TheresultsshowthatthecompatibilizationeffectdependsontheDPCcontentheavily.CompatibilizationisenhancedwithDCPcontentincreasingandreachesthebestwhenDCPcontentis0.25phr.WhenDCPcontentis0.30phr,however,compatibilizationisn
6、otanymoreenhancedbutbecomesdeclinable.2)ThemechanicalpropertiestestingandVSPmeasurementshowthattheeffortofmonomerGMAcontentoncompatibilizationisnotobvious.WithGMAcontentincreasingfrom0.25phrto1.OOphr,compatibilizationeffortbecomesworseandworse,butchangesonlyslightly.3)Througha
7、rectangularslitdieextrusion,hotstretching,andquenchingprocess,aninsitumicrofibrillarblendwassuccessfullyfabricatedandSEMobservationshowsthatPETwasdeformedintowell.defnedmicrofibrilsintheblend.Themechanicalpropertiestesting,DSC,DMA,DRAandVSPshowthatinsitumicrofibrillarmethodimp
8、rovestensilestrength,lossfactor,elasticmodulus,viscousmodulus