Polypropylene Reinforced by Cellulose Fibers Modified with Functional Latex，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）-中国聚合物网,论文下载

Polypropylene Reinforced by Cellulose Fibers Modified with Functional Latex

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biocomposite polypropylene cellulose fiber core-shell latex reinforcement

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分子表征

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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：

Inrecentyears.thermoplasticcompositesreinforcedwithnaturalcellulosefibershavebecomesignificantlypopularduetotheecologicalawarenessandenvironmentalconcernsoversyntheticmaterials.However,theelementaryunitofcellulosecontainsthreehydroxylgroups,whichrendersfibershydrophiliccl].Onthecontrary,mostofthethermoplasticpolymeric.matricesusedforcompositessuchaspolyethylene(PE),polypropylene(PP),etc.havemodestcohesiveenergiesandarehighlyhydrophobic.Themaindrawbacksintheuseofcellulosefiberswithoutmodificationinthermoplasticsarethepoorcompatibilitybetweenhydrophilicfibersandthehydrophobicsubstrate,andtheinherenthighmoisturesorptionwhichcouldcausedeformationofthefibers.Aneasyapproachtoaddressthisproblemistohydrophobic-modifythecellulosefiber.Inthiswork,polymerlatexbearingflexiblepolymericchainswithlowglasstransitiontemperature(Tg)andcore-shellstructurewasusedforthesurfacetreatmentofcellulosefibersc2].Thetougheningofcellulosefiber-reinforcedPPwasperformedviaadsorbingthecationicpolymericlatexontosulfiteandchemithermomechanicalpulp(CTMP)fibersasreinforcements,whichprovidesanovelapproachforrenderingthesurfaceofcellulosefibreselastomericandhydrophobic.Themechanical,morphologicalandthermalpropertiesoftheresultingbiocomposites,containingupt040wt%ofthemodifiedcellulosefibers,wereinvestigated.TheresultsshowedthatwiththeincreaseofthelatexdosageuptoIand2wt%(ondryfibers)forsulfitepulpandCTMPrespectively,theimpact,tensileandflexuralstrengthsofthemodifiedfibre/PPbiocompositesweresignificantlyincreased.ThetougheningmechanismwasdiscussedbasedontheretardingofcrackpropagationandthepromotingofcrystallizationofPPmatrix(asrevealedbyDSCcharacterization).Theoverallperformanceofthebiocompositedemonstratedthatcationiclatex-modifiedcellulosefibreisveryeffectiveinreinforcingthermoplastic-basedbiocompositesalongwiththesynergeticeffectonenhancingcrystallinityofpolymermatrix.

作者：

Y. Pad , H. Xiao , Y. Zhao

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2013-06-21 15:55:52

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