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Synthesis of Poly (vinyl acetate) Based Amphiphilic Surfactant by RAFT/ATRP Polymerization and Preparation Macroporous Materials by Emulsion-templating Polymerization  
Synthesis of Poly (vinyl acetate) Based Amphiphilic Surfactant by RAFT/ATRP Polymerization and Preparation Macroporous Materials by Emulsion-templating Polymerization
資料類型: PDF文件
關鍵詞: Amphiphilic  block  copolymers  RAFT/ATRP  C02  -in-water  emulsion  
資料大小: 104K
所屬學科: 分子表征
來源: 第六屆亞歐研討會上處理和性能增強聚合物會議文集(2013.6.2-6 武漢)
簡介:
Supercriticalcarbondioxide(scC02)isanattractivealternativetoconventionalsolventscl].However,scC02issofeeblethatmostofpolymersandpolarmassesaredifficulttodissolveinit,whichlimitsitsapplications.Thisproblemcanbeovercamebypreparingemulsionormicroemulsionbyusingamphiphilicsurfanctants.Althoughfluoro-orsilicone-basedsurfactantsshowgoodperformanceinscC02,thehighcostisprohibitiveonanindustrialscaleapplication.Recently,thereisanincreasingdrivetodiscoverC02-philichydrocarbonmaterialswithlow-cost,suchaspoly(vinylacetate)(PVAc),etal,whichcanbealsopreparedstabilisers,amphiphilicsurfactants.[2]Mostofhydrocarbon-basedsurfanctantsreportedintheliteraturesfocusonnon-ionicsurfactants,andthereisfewreportsaboutionicsurfactant.[3]Inthisstudy,anewionicsurfactantpoly(vinylacetate)-b-poly(dimethylaminoethylmethacrylate)(PVAc-b-PDMEMA)wassynthesizedbyacombinationofRAFTandATRPmethodsbyusingabromoxanthateiniferteraschaintransferagent(CTA).ThehydrophilicabilityofPVAc-b-PDMAEMAcopolymerscanbetunedbycontrollingthemolecularchainlength,orpHvalueofthesolution.ItisfoundthatPVAc-trPDMAEMAcopolymersareeffectivesurfactantsforC02-in-wateremulsionswithhighstability.Polymerizationofemulsion-templatingformedbyacrylamide(AM)solution/C02system,PAMmonolithsmaterialswhichconformcloselytotheinteriorofthereactionvesselareobtained.TheaverageporesizeofthemonolithsmaterialswhichiscalculatedbySEManalysisrangesfrom10-25ym.
作者: S. C. Zhang, W. Luo, B. E. Tan
上傳時間: 2013-07-04 16:03:18
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