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Processing and Microcellular Poly(Characterization of Solid and lactic acid)-based Nanocomposites  
Processing and Microcellular Poly(Characterization of Solid and lactic acid)-based Nanocomposites
资料类型: PDF文件
关键词: poly(lactic  acid)  (pla)  nanoclay  microcellular  inj  ection  
molding  
资料大小: 108K
所属学科: 分子表征
来源: 第六届亚欧研讨会上处理和性能增强聚合物会议文集(2013.6.2-6 武汉)
简介:
Themorphology,microstructure,tensileanddynamicmechanicalpropertiesofsolidandmicrocellularpoly(lacticacid)(PLA)/polyhydroxybutyrate-valerate(PHBV)blendsandPLA/PHBV/claynanocompositestogetherwiththermalandtheologicalpropertiesofsolidPLA/PHBVblendsandPLA/PHBV/claynanocompositeswereinvestigated.Conventionalandmicrocellularinjection-moldingprocesswereusedtoproducesolidandmicrocellularASTMtensiletestbars,respectively.Nitrogeninthesupercriticalstatewasusedasthephysicalblowingagentinthemicrocellularinjectionmoldingexperiments.ThetheologicalbehaviorofPLA/PHBVblendsexhibitedaNewtonianfluidbehaviorwheretheirnanocompositecounterpartsshowedastrongshear-thinningbehavioroverthefullfrequencyrange.Anobviouspseudo-solid-likebehavioroverawiderangeoffrequenciesinthePLA/PHBV/claynanocompositessuggestedastronginteractionbetweenthePLA/PHBVblendandthenanoclaythatrestrictedtherelaxationofthepolymerchains.PLA/PHBV/claynanocompositespossessahighermodulusandgreatermeltstrengththanPLA/PHBVblends.Theadditionofnanoclaydecreasedtheaveragecellsize,andincreasedthecelldensityofmicrocellularPLA/PHBVspecimens.Asacrystallinenucleationagent,nanoclaysignificantlyimprovedthecrystallinityofPHBVintheblend,thusleadingtoarelativelyhighermodulusforbothsolidandmicrocellularspecimens.However,nanoclayhadlesseffectonthetensilestrengthandstrain-at-break.
作者: H. B. Zhao , L. S. Turng , X. F. Peng
上传时间: 2013-07-02 15:50:36
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