热处理对聚丙烯动态力学性能的影响(5)

　第5期陈　厚等:AN AA

共聚物热解反应表观活化能的计算245

DETERMINATIONOFAPPARENTACTIVATIONENERGYOFDEGRADATIONOFACRYLONITRILE ACRYLICACIDCOPOLYMERS

111CHENHou,LIUJun2shen,QURong2jun,122SUNYan2zhi,WANGCheng2guo,CAIHua2su

(1.CollegeofChemistryandMaterialsScience,YantaiNormal

University,Yantai264025,China;2.CollegeofMaterialsSandEngineering,ShandongUn,JABSTRACT:Differentialscanningcalorimofacrylonitrile acrylicacidcopolymerinairw.

activationenergyofdegradationof

copolymerswmethod.Effectofcopolymerizationconditionsontheapparentofcopolymerwasstudied.Itshowsthatwithanincreaseofdimethylsulfoxideconcentrationinsolventmixture,thedegradationapparentactivationenergyincreasesrapidly.

Theapparentactivationenergydropsquicklywiththecomononeracrylicacid

Theapparentactivationenergyalsoincreaseswiththe

concentrationrising,andsuchachangebecomeslessprominentasthemassratioofacrylicacid 95.acrylonitrilegoesbeyond5 copolymerizationtemperaturerising.

Keywords:acrylonitrile;degradation;apparentactivationenergy

(上接第241页。continuedfromp.241)

EFFECTSOFHEATTREATMENTONDYNAMICMECHANICAL

BEHAVIOROFINJECTEDPOLYPROPYLENE

11,2

XUEFeng,CHENGRong2shi

(1.CollegeofMaterialsScienceandEngineering,SouthChinaUniversityof

Technology,Guangzhou510640,China;2.CollegeofChemistry&Chemical

Engineering,NanjingUniversity,Nanjing210093,China)

ABSTRACT:Thestoragemodulusofpolypropyleneconsiderableincreasedafterheattreatment.Theeffectoftheheattreatmenttimeat110℃and130℃onthedynamicmechanicalbehaviorofaninjectedpolypropylenesamplewasstudied.TheincreaseofstoragemoduluswascausedbyincreasedcrystallinityasdemonstratedbyDSCmeasurementsforthesamesample.Butiftheheattreatmenttimewastoolong,thecrystallinityandthestoragemodulusweredecreasedbecauseofthedisentanglementofsomeweaklink.

Keywords:heattreatment;polypropylene;dynamicmechanicproperties;crystalline

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