相對濕度對單軸拉伸聚對苯二甲酸乙二酯纖維結(jié)構(gòu)演變的作用.pdf

1、分類號：TQ340天津工業(yè)大學研究生畢業(yè)論文Y86GlG2相對濕度對單軸拉伸聚對苯二甲酸乙二酯纖維結(jié)構(gòu)演變的作用(申請碩士學位)研究生：宋娜指導教師：張志英教授專業(yè)名稱：材料學大津工業(yè)大學材料化工學皖二零零^年一J]AbstractInthispapertheinfluenceofrelativehumidityoncoldcrystallizationbehaviorofuniaxiallyorientedPETfiberswasin

2、vestigatedbyusingDSCmethodwithaconstantheatingrateTheconditionoftheheattreatmentwasestablishedthroughtheDSCcurvesTheequatorialandmeridionalwide—angleXraydiffractionofthesamplewascarriedoutAnnonisothermalequationWaSusedfo

3、rkineticsanalysisofthecrystallizationprogressbytheleastsquaresmethodFirst，theas—spunPETfiberswereusedtopreparetheorientedPETfiberswithdifferentdegreeoforientationAndthentheywerestoredunderdifferentrelativehumiditywhichwa

4、scontrolledthroughsaturationsolutionofdifferentsalts，ManytestswerecarriedoutontheorientedPETfibersBythetestofthemoistureregain，themoistureregainofthefibersincreaSewjthraisingtherelativehumidityThroughthedegreeoforientati

5、onofthePETfibersitwasfoundthatthedegreeoforientationoftheuniaxiallyorientedfibersincreaseswithdrawratioatacertainhumidityWhentheenvironmenthumidityisbetweenO％RH～50％RHthedegreeoforientationofthefibers、】l，itlldrawratioat24

6、8，330and391istrendingdownwiththeincreasingofdegreeoforientationWhentheenvironmenthumidityisbetween50％RH～100％RH，thedegreeofdrientationof也efiberswiththedrawratioat248，330and391istrendingup撕ththeincreasingofdegreeoforientat

7、ionThefiberswithdrawratioat175aretrendingdownthroughthewholehumidityregionTheDSCcarvewjmconstantheatingofthesamplestoredunderthe0％RItindicatesthatthecoldcrystallizationpeaksofthehighlyorientedfibersbecomeverydispersivean

8、dspreadtothelowertemperatureTheDSCcurvewitllconstantheatingofthesamplestoredunderdifferentvariesrelativehumidityshowsthattheglasstransitiontemperature(毛)shiftstowardalowertemperatureandthecoldcrystallizationtemperature(助

9、extendstothelowtemperaturewithincreasingtherelativehumidityAndthecoldcrystallizationdividedintotwosmallpeaksDuringtheWAXDtest，theconditionforpreparingPETfiberswithorientationbutnoobviouslycrystallizationwasfoundThemodelo