納米碳酸鈣對聚氯乙烯以及聚氯乙烯-彈性體共混物性能的影響.pdf

1、上海交通大學(xué)碩士學(xué)位論文納米碳酸鈣對聚氯乙烯以及聚氯乙烯彈性體共混物性能的影響姓名：陳寧申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：張勇200312016EffectsofCalciumCarbonateNanoparticlesonPropertiesofPolyvinylChlidePolyvinylChlideElastomerBlendsABSTRACTCompositesbasedonpolyvinylchlide(PVC)nan

2、oscalecalciumcarbonate(nanoCaCO3)particleswerepreparedviameltmixingmethod.ThemicrostructureofthecompositeswasobservedacomparisonwasmadeonthedifferenteffectsofnanoCaCO3particlesultrafinecalciumcarbonate(ultrafineCaCO3)par

3、ticlesonthemechanicalpropertiesofPVC.ItwasfoundthatnanoCaCO3surfacemodifiedwithstearicacidcouldbewelldispersedinPVCitcouldincreasethenotchedimpactstrengthelongationatbreakflexuralmodulusofPVCmeeffectivelythanultrafineCaC

4、O3.ItwasalsofoundthatnanoCaCO3increasedtheyieldstrengthofPVCwhileultrafineCaCO3decreasedtheyieldstrengthofPVC.BothnanoCaCO3ultrafineCaCO3decreasedtheflexuralstrengthofPVC.TheeffectsofnanoCaCO3onpropertiesofPVCelastomerbl

5、endswerestudied.Amodifiedacrylonitrilebutadienestyrenecopolymer(ABSBlendex)wasusedastheelastomer.ItwasfoundthatnanoCaCO3couldalsobewelldispersedinPVCBlendexblendsnanoCaCO3showedamuchstrongertougheningeffectonPVCblendexbl

6、endsthanthatonPVCwithoutBlendex.ItwasalsofoundthatnanoCaCO3increasedtheflexuralmodulusVicatsofteningtemperaturestagemodulusglasstransitiontemperatureofPVCBlendexblendsdecreasedtheyieldstrengthelongationatbreakheatdegrada

7、tiontemperature.ThefracturebehaviofPVCBlendexnanoCaCO3compositeswasstudiedbyusingamodifiedEssentialWkofFracture(EWF)method.TheintroductionofnanoCaCO3dramaticallyincreasedthelimitingspecificfractureenergyofPVCBlendexblend

8、sdecreasedthedissipativeenergydensityofPVCBlendexblends.ThetwofractureparameterswereaffectedbytheparticlesizeofnanoCaCO3significantlywhiletheywereindependentofspecimenthickness.Withtheincreaseofloadingrateboththefracture