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1、PolymerTesting24(2005)468473www.elsevier.com/locate/polytestMaterialPropertiesTensileandimpactbehaviorofpolypropylene/lowdensitypolyethyleneblendsR.Strapasson,S.C.Amico*,M.F.R.Pereira,T.H.D.SydenstrickerMechanicalEngineeringDepartment,FederalUniversityofParana′(UFPR),P.O.Box19.011
2、,81.531-990Curitiba-PR,BrazilReceived18November2004;accepted7January2005AbstractBlendsofpolypropylene(PP)andlow-densitypolyethylene(LDPE)maycontributetomakerecyclingmoreeconomicallyattractive.TheaimofthisworkwastomakePP/LDPEblends(0/100,25/75,50/50,75/25and100/0w/w)viainjectionmol
3、dingcarriedoutundervariousinjectiontemperaturesandtoevaluatetheirtensileandimpactproperties.Theblendsyieldedtensilestressstraincurvesverydependentontheircomposition,especiallyregardingelongationatbreakandthepresenceofnecking.Anirregularbehaviorforthe50/50w/wblendisreported.Neverth
4、eless,alinearvariationoftheyieldstrengthandelasticmoduluswiththeblendcompositionwasobserved.Thebehavioroftheblendwasalsoverydependentonprocessingtemperature.Additionof25%ofLDPEtothePPmayresultinsimilardegradationofitsmechanicalpropertiestothatcausedbya108Cprocessingtemperatureincr
5、ease.Statisticalanalysesprovedvaluablewhenreportingresultsconcerningblends.q2005ElsevierLtd.Allrightsreserved.Keywords:Low-densitypolyethylene;Polypropylene;Blends;Tensileandimpactproperties1.Introductionmaterialisusuallyamixtureofseveralpolymers,whichmakesprocessingmoredif?cultan
6、dalsolimitsthenumberAstheeconomyachievesglobalstatus,manyfactorsofpotentialapplications[1].regardingthecompetitivenessofanationcomeunderThemostabundantplasticsinBrazilianmunicipalwasteinvestigation.Morerecently,togetherwithimportantareasarepolypropylene(PP),poly(ethylene-terephtha
7、late)andsuchastechnologyadvancementandtechnologytransfer,polyethylene(PE),thelatterbeingavailableindifferentissuesrelatedtosustainabledevelopmentandenvironmentgradessuchaslowdensitypolyethylene(LDPE),linearlowpreservationarereceivingincreasingattentionfromthedensitypolyethylene(LL
8、DPE)andhighdensitypolyethy-worldc
