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1、Availableonlineatwww.sciencedirect.comBioresourceTechnology99(2008)4615–4620PHA–rubberblends:Synthesis,characterizationandbiodegradationRachanaBhatt,DishmaShah,K.C.Patel,UjjvalTrivedi*DepartmentofBiosciences,SardarPatelUniversity,VallabhVidyanagar388120,Gujarat
2、,IndiaReceived2November2006;receivedinrevisedform18April2007;accepted1June2007Availableonline30August2007AbstractMediumchainlengthpolyhydroxyalkanoates(mcl-PHA)anddifferentrubbers;namelynaturalrubber,nitrilerubberandbutadienerubberwereblendedatroomtemperatureusi
3、ngsolutionblendingtechnique.Blendsconstituted5%,10%and15%ofmcl-PHAindif-ferentrubbers.Thermogravimetricanalysisofmcl-PHAshowedthemeltingtemperatureofthepolymeraround50°C.Thermalprop-ertiesofthesynthesizedblendwerestudiedbyDifferentialScanningCalorimetrywhichconfi
4、rmedeffectiveblendingbetweenthepolymers.Blendingofmcl-PHAwithnaturalrubberledtothesynthesisofadifferentpolymerhavingthemeltingpointof90°C.Deg-radationstudiesoftheblendswerecarriedoutusingasoilisolate,Pseudomonassp.202for30days.Extracellularproteinconcentrationasw
5、ellasOD660duetothegrowthofPseudomonassp.202wasstudied.Thedegradationofblendedplasticmaterial,asevidencedby%weightlossafterdegradationandincreaseinthegrowthoforganismcorrelatedwiththeamountofmcl-PHApresentinthesample.GrowthofPseudomonassp.202resultedin14.63%,16.
6、12%and3.84%weightlossofPHA:rubberblends(natural,nitrileandbutadienerubber).Scanningelectronmicroscopicstudiesafter30daysofincubationfurtherconfirmedbiodegradationofthefilms.Ó2007ElsevierLtd.Allrightsreserved.Keywords:Comamonastestosteroni;PHA:rubberblends;DSC;TGA
7、;Biodegradation1.IntroductionaccumulateasdiscretesphericalgranulesincellcytoplasmandserveasstoragecompoundsforenergyandcarbonMostdisposedplasticmaterialsremainatthesiteofdis-(AsrarandGruys,2002).PHAsaresynthesizedbywideposalduetotheirresistancetobiologicalbreak
8、downandvarietyofbacteriaviadifferentpathwaysfromcoenzymeresultinenvironmentalpollution.Therecognitionofenvi-Athioestersofhydroxyalkanoicacidobtainedduringfattyronmentalpollut
