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时间:2020-03-27
《聚氨酯对聚乳酸溶液流变性能的影响.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24卷第11期化学研究与应用Vo1.24,No.112012年11月ChemicalResearchandApplicationNov.,2012文章编号:1004—1656(2012)11.1720-05聚氨酯对聚乳酸溶液流变性能的影响左丹英h,易长海,甘厚磊,陈玉波’(1.武汉纺织大学新型纺织材料绿色加工及其功能化教育部重点实验室,湖北武汉430073;2.广东省均安牛仔服装研究院,广东佛山528329)摘要:采用高级旋转流变仪研究了1,4-二氧六环/左旋聚乳酸/聚氨酯(DO/PLLA/PU)共混溶液
2、的流变性能,探讨了PU的加人对共混溶液的流动曲线、非牛顿指数及表观粘流活化能的影响。结果表明,在实验条件下,共混溶液为剪切变稀非牛顿流体,PU含量的增加使得共混溶液的表观粘度增大;共混溶液的非牛顿指数的研究表明,随着PU含量的增加,非牛顿指数呈现下降趋势,随着温度的升高,同一组成的共混溶液非牛顿指数也呈现下降趋势,说明共混溶液的粘度随着PU含量的增加以及温度的升高,对剪切速率的依赖性依然很强。粘流活化能的研究结果表明,在较高剪切速率下,Pu的加入使得共混溶液对温度的敏感性下降。关键词:聚乳酸;聚氨酯;共混溶
3、液;剪切速率;流变性能中图分类号:0631.4文献标识码:AEfectsofpolyurethaneonrheologyperformanceofpoly(1actic-acid)solutionZUODan.ying,YIChang.hai,GANHou.1ei’,CHENYu.be(1.KeyLabforGreenProcessingandFunctionalTextileofNewTextileMaterials,MinistryofEducation,WuhanTextileUniversity,H
4、ubei,430073,China;2.GuangdongJunanJeansInstitute,Guangdong,528329,China)Abstract:Therheologicalbehaviorsofblendsolutionsof1,4-dioxane/poly(L-lactic-acid)/polyurethane(DO/PLLA/PU)werein—vestigatedthroughtheSeniorrotaryrheometer,andtheefectsofPUadditionOilfl
5、owcurves,non—Newtonianindexandapparentvis-cosityflowactivationenergyofblendsolutionswerediscussed.Itwasfoundthatblendedsolutionsweretheshearthinningnon-New—tertianfluidsinthisexperiment.PUadditionsmadetheviscositiesofblendsolutionsincrease,andthehigherPUco
6、ntentwas,thelargertheblendsolutionviscositywas,whichindicatedthatanincrementinPUcontentledtothedependenceenhancementonshearrate.NOn—Newtonianindexesoftheblendsolutionsshowedthatthenon—NewtonianindexshowedadownwardtrendwiththeincreaseofPUcontent,andasthetem
7、peraturerise,thenonNewtonianindexoftheblendedsolutionswiththesamecompositionalSOshowedadownwardtrend.whichrevealedthatthedependenceoftheviscosityofeblendedsolutionsonshearratewasstil!verystrongwithPUcontentincreasingaswellasthetemperaturerising.But,therese
8、archresultsoftheviscousflowactivationenergyshowedthatPUmadethesensitivitytotemperatureofblendsolutiondropinthehishshearrate.Thestudyontherheologicalprop—ertiesofPLLA/PUblendsolutionssuggestedthatitWasnotprope
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