聚醚型聚氨酯与其复合材料的结构与性能分析

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1、太原理j：大学硕士研究生学位论文ofPU／Si02increasedwiththeincreaseofaveragechainextensioncoefficient．TheDSCresultsverifiedthataddingSi02particlescaninfluencethecrystalofhardsegmentsofPU．TGAsuggestedthatPU／Si02compositesdidn’timprovetheheatresistanceproperty．DMAresultssug

2、gestedthattheintroductionofSi02inpolymercansignificantlyenhanceboththestoragemodulusandlossmodulusofcomposites．Theglasstransitiontemperature(Tg)ofPU／Si02compositesreduced．Besides，thesolventresistancepropertyweregreatlyimprovedbyloadingSi02particlesItwasd

3、emonstratedthatthePU／CNTscompositesinPTMG．．TDI．．E．．300hadoptimalmechanicalpropertiesincomparisonwithPU／CNTscompositesinPTMG—TDI—TMP+BD．ThemechanicalpropertiesofPU／CNTscompositeincreasedwiththecontentof—NCOgroupinpre—polymer．TheelectricalconductivityofPU／

4、CNTscompositeincreasedwithCNTscontent．ThecrosslinkagenthadgreateffectonelectricalconductivityofPU／CNTscomposite．TheelectricalconductivityofPU／CNTscompositepreparedwithTMP+BDascrosslinkagentwasbetterthanthatofPU／CNTscompositepreparedwithE一300ascrosslinkag

5、entatthesamecontentofCNTs．Ingeneral，theelectricalconductivityofPU／CNTscompositeswasdecreasedwiththeincreaseofthecontentofNCOgroupinpre—polymer．TheDSCandDMAresultssuggestedthataddingCNTspaniclescanimprovemicro—phaseseparationandraisecrystaltemperatureofha

6、rdsegmentsofPU．AndthestoragemodulusandlossmodulusofPU／CNTscompositeincreaseddramaticly．TheTgofPU／CNTsdecreasebyVl太原理1：大学硕士研究生学位论文17．18。CcomparedtopurePU．TheSEMphotographsrevealedthattheCNTsparticlesweredispersedhomogeneouslyinPU．Themechanicaltestresultss

7、howedthatthetearresistanceandtensilestrengthofdiversemicrostructurePUincreasedcomparedwithpurePU．ThedifferentmicrostructureofPUcaninfluencethemechanicalproperty，solventresistanceproperty，crystalofhardsegmentsandmicro—phaseseparation．TGAsuggestedmicrostru

8、cturedidn’timprovetheheatresistanceofPU．DMAresultsshowedthatdiversemicrostructurePUhadahigherlossmodulusandlowerTg．Inthispaper，thediversemicrostructurePU／13Xcompositeswereobtainedwithdifferentchainextensionmethods．Theeffec