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1、JournalofPolymersandtheEnvironment,Vol.13,No.1,January2005(Ó2005)DOI:10.1007/s10924-004-1215-6CharacterizationofBiodegradableCompositeFilmsPreparedfromBlendsofPoly(VinylAlcohol),Cornstarch,andLignocellulosicFiber1,4232S.H.Imam,P.Cinelli,S.H.Gordon,andE.Chiellin
2、iSeveralcompositeblendsofpoly(vinylalcohol)(PVA)andlignocellulosicfiberswerepreparedandcharacterized.CohesiveandflexiblecastfilmswereobtainedbyblendinglignocellulosicfibersderivedfromorangewasteandPVAwithorwithoutcornstarch.Filmswereevaluatedfortheirthermalstabilit
3、y,waterpermeabilityandbiodegradationproperties.Thermogravi-metricanalysis(TGA)indicatedthesuitabilityofformulationsformeltprocessing,andforapplicationasmulchfilmsinfieldsatmuchhighertemperatures.Compositefilmswereper-meabletowater,butatthesametimeabletomaintaincon
4、sistencyandcompositionupondrying.Chemicalcrosslinkingofstarch,fiberandPVA,allhydroxylfunctionalizedpolymers,byhexamethoxymethylmelamine(HMMM)improvedwaterresistanceinfilms.Filmsgener-allybiodegradedwithin30daysinsoil,achievingbetween50–80%mineralization.Bothstarc
5、handlignocellulosicfiberdegradedmuchmorerapidlythanPVA.Interestingly,additionoffibertoformulationsenhancedthePVAdegradation.KEYWORDS:Composite;mulchfilm;renewableresources;fillers;poly(vinylalcohol);biodegradation;lignocellulosic.INTRODUCTIONyears[2,3].Effortshavebe
6、enmadetodevelopenvi-ronmentallycompatibleplasticproductsbyincorpo-Plasticmaterialsarecommonlyusedinagricul-ratingrenewablepolymersasanalternativetoturalpracticesforavarietyofapplicationsthatincludepetroleum-derivedchemicals[4,5].Therenewablemulchfilms,greenhouse
7、constructionmaterials,polymersarerelativelyinexpensive,environmentallypackagingmaterials,etc.[1].Conventionally,suchfriendly,andalsonaturallybiodegradable.Particu-plasticsaremanufacturedfrompetroleumderivativeslarly,plantmaterialderivedfromrenewablecrops,by-tha
8、tarenotdegradableandpersistintheenvironmentproductsortheirindustriallyprocessedwastes,offeralongaftertheirusefullifeisover.Asaresult,interestingoodsourceoffiberforapplications
