聚酰亚胺纤维的制备与其结构性能分析

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1、浙江理工大学硕士学位论文聚酰亚胺纤维的制备及其结构性能研究becomehigherwithincreasingtemperature．Theviscousflowactivationenergydecreasedwithincreasingofshearrate，increasedwiththeincreasingsolutionconcentration．Thestructuralviscosityindexdecreasedwiththeincreasingtemperatureandthedecreasingsolutionconcentrati

2、on．ThePI-NMP—H20systemwasdeterminedbycloud-pointtitrationmethod．Thecloud—pointdataexhibitedalinearcorrelation．ThePI-NMP—H20ternaryphasediagramsatdifferenttemperaturesweredrewbythecomponentsofdifferentpolymerconcentrations．TheresultsshowedthatthepositionofbinodalsinthevicinityofP

3、I-NMPaxiswereclosedtoPI-NMPaxiswiththedecreasingtemperature．Therefore，polyimideas-spunfiberswithdensestructure，lessholesdistributionandbeRerperformancewouldbeobtainedbyhigherconcentrationofthespinningsolutionandlowertemperatureofthecoagulationbath．Inordertoobminpolyimidefiberswi

4、thdensestructure，lessholesdistributionandbetterperformance，thepolyimidespunfiberwaspreparedbywetspinning，inwhichthecoagulationbathwasthemixtureofNMPandH20．Theresultshowedthatpolyimideas-spunfiberswerepreparedwhenthetemperatureofcoagulationbathis100C，theratioofwaterandNMPis5：5，th

5、eratioofspinneretplatetensileinthefirstcoagulationbathandplasticstretchinginthesecondbathisabout2timesand1．5times．Thesize，tensilestrength，initialmodulusandelongationatbreakoffibersisrespectively7．95dtex，0．27cN／dtex，13．56cN／dtex，5．2％．Toacquirepolyimidefiberswithbettermechanicalan

6、dheatresistanceproperty,thespunfibershouldbetreatedathighertemperature．Theresultshowedthathighperformancepolyimidefiberswouldgetwhenheattemperatureandtimearerespectively30minand340。Cinnitrogenatmosphere．Thesize，tensilestrength，initialmodulusoffibersis9．23dtex，0．61cN／dtex，17．22cN

7、／dtex．Throughheattreatmentoftheas-spunfiberat340。C，thecompletelyimidizedpolyimidefiberspresentsthehighglasstransitiontemperatureat278．460C．Keyword：polyimidefibers，rheology,cloud-pointtitration，phaseseparation，wetspinning，heattreatment．IV浙江理工大学硕士学位论文聚酰亚胺纤维的制备及其结构性能研究目录第一章绪论⋯⋯⋯⋯⋯⋯

8、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．1I．1聚酰亚胺及其纤维概述⋯⋯⋯⋯⋯⋯⋯⋯⋯