学科分类
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1 个结果
  • 简介:Samplesofpolyphenylsilsisquioxane(PPSQ)usingCaF2orMgF2asthemaincatalystshadbeenpreparedunderdifferentpolymerizationconditions.TheresultsweretreatedonanorthogonaldesignL9(34).Allweight-averagemolecularweights(MW)ofPPSQhadbeenmeasuredbygelpermeationchromatography(GPC).Effectsofpolymerizationconditionsincludingreactiontemperature,compositionofthedualcatalysts(CaF2orMgF2andDCC),mixtureofsolventsandreactiontimeonMWofPPSQhavebeendiscussed.ThequantityofthecatalystsisthemostimportantfactorthataffectsMWofPPSQ.Reactiontemperatureisthesecondimportantfactor.AppropriatepolymerizationconditionhasbeenestablishedtogetPPSQwithhighMW.

  • 标签: Polyphenylsilsisquioxane POLYMERIZATION CONDITIONS MOLECULAR WEIGHT