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Synthesis of Poly (vinyl acetate) Based Amphiphilic Surfactant by RAFT/ATRP Polymerization and Preparation Macroporous Materials by Emulsion-templating Polymerization

資料類(lèi)型：

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關(guān)鍵詞：

Amphiphilic block copolymers RAFT/ATRP C02 -in-water emulsion

資料大?。?/td>

104K

所屬學(xué)科：

分子表征

來(lái)源：

第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集（2013.6.2-6 武漢）

簡(jiǎn)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(shí)間：

2013-07-04 16:03:18

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