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Polypropylene Reinforced by Cellulose Fibers Modified with Functional Latex

資料類型：

PDF文件

關鍵詞：

biocomposite polypropylene cellulose fiber core-shell latex reinforcement

資料大小：

119K

所屬學科：

分子表征

來源：

第六屆亞歐研討會上處理和性能增強聚合物會議文集（2013.6.2-6 武漢）

簡介：

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

上傳時間：

2013-06-21 15:55:52

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