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ID:32464619
大小:3.56 MB
页数:58页
时间:2019-02-06
《后纺工艺对不同冻胶浓度uhmwpe纤维结构性能的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、北京服装学院硕士论文后纺工艺对不同冻胶浓度UHMWPE纤维结构性能的影响摘要超高分子量聚乙烯(UHMWPE)纤维具有卓越的性能,被广泛应用在工业及一些特殊领域。本论文以二甲苯为萃取剂对不同浓度的超高分子量聚乙烯(UHMWPE)冻胶纤维的萃取与干燥工艺进行了研究,探索了UHMWPE纤维冻胶浓度的变化对成品丝性能的影响。对冻胶浓度为10%.12%的纤维在不同条件下进行萃取干燥,并对纤维进行了室温拉伸。运用Instronll22材料万能试验机、扫描电子显微镜(SEM)对纤维力学性能、形态结构进行研究;采用了x射线衍射(WAXD)、差
2、式扫描量热仪(DSC)等手段对纤维的结晶、熔融等性能进行了表征与测试。实验结果表明:超声波萃取有利于提高萃取效率。从除油工艺角度考虑,萃取温度应该选定在50℃以上;在同一萃取温度下的纤维中,张紧干燥后纤维热力学性能优于松弛干燥;干燥温度为30℃时最大拉伸倍数达到一峰值;随着二甲苯含量降低,最大拉伸倍数减小;在相同萃取干燥条件下,随着冻胶浓度的升高,纤维的最大拉伸倍数和强度逐渐降低;萃取温度为60℃时,纤维的拉伸性能呈现最佳值;当冻胶浓度较高时,随着冻胶浓度的逐渐提高,冻胶纤维的除油率逐渐下降,结晶度逐渐增大,最大拉伸倍数逐渐降
3、低。关键词:超高分子量聚乙烯;冻胶纤维;萃取;干燥;冻胶浓度北京服装学院硕上论文AFTERTHESP州INGPROCESSFORDIFFERENTCONCENTRATIONS0FGELSTRUCTUREANDPRoPEIⅡIESOFUHMWPEFIBERAbstractTheextraction—dryingprocessesofUHMWPEgelfibresofdifferentconcentrationswerestudiedinthispaper,Theinfluenceofchangesofgelconcentrati
4、onofUHMWPEfiberonthefinalperformanceofthefibershasbeenexplored。Differentconcentrationsofgelfibers(10%·12%respectively)wereextractedanddryedatdifferentconditionsandthenthefiberweredrawnatroomtemperature。TheInstronl122testingmachine,ScanningElectronMicroscopy(SEM)were
5、usedinthissubjectforstudyingmechanicalandmorphologicalpropertiesofthefibers。Aseriesofmethods,suchasWideangleX-rayDiffraction(WaXD),DifferentialScanningCalorimeter(DSC),andothermethodsWereusedtotestthepercentagecrystallinity,meltingtemperatureandotherpropertiesofthef
6、ibers。Theexperimentalresultsshowedthat:Ultrasonicextractioncanincreasetheextractionefficiency。view-pointofsolventremovalprocess,theextractiontemperatureshouldbeselectedhigherthan50*C;dryintensionisbetterthandryinrelaxedformwhentheextractiontemperatureissimilar;Dryte
7、mperatureis30℃maximumdrawratioreachedapeak;Asthexylenecontentdecreased,thebiggestdrawratiodecreaseswithincreasingconcentration,thecriticaldrawratioandstrengthoffibergraduallyreduced,whenextracting-dryingprocessesissimilar。Themaximumdrawratiosofthefiberwasachievedwhe
8、ntheextractionwascarriedoutat60℃。WiththeincreaseintheconcentrationofUHMWPEgels,thecriticaldrawratioandstrengthoffibergraduallyreduced,andt
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