聚乙烯醇硅有机无机杂化渗透蒸发脱水膜的研究

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1、厦门大学博士学位论文聚乙烯醇/硅有机-无机杂化渗透蒸发脱水膜的研究姓名：张秋根申请学位级别：博士专业：工业催化指导教师：刘庆林20090401AbstractHydrophilicpolymericmembranesareeasilyswolleninanaqueoussolution，resultinginadecreaseofselectivity．111eywerenormallymodifiedbychemicalcrosslinkingtoreducetheirswellingandincreaseselectivity,whileaccompa

2、nied、析Ⅱlasacrificeinwaterpermeability．Therefore，theobjectiveofthisworkistodecreasetheswellingofpolymericmembranesinallaqueoussolutionandenhancetheirwaterpermselectivity．Forthispurpose，poly(vinylalcoh01)(PVA)asahydrophilicmembranematerialandsilicaprecursorsasinorganiccomponentswere

3、usedtopreparePVA／silicaorganic—inorganichybridmembranesforpervaporationdehydrationofethan01．TheswellingpropertiesofthePVAmembraneswerestudiedbYexperimentsandmolecularsimulation．WiththeassistanceofmolecularsimulationandinversegaschromatographyOGC)，丫-aminopropyltriethoxysilane(APTEO

4、S)and1,2-bis(triethxysilyl)ethane(BTEE)werefinallyusedtopreparePVA／silicahybridmembranes，whosephysicochemicalproperties，surfacetopography,swellingpropertiesandpervaporationperformanceswereinvestigatedindetail．．FortheswollenPVA。membranes，PVAchainsstretchedeasilyandtheirmobilityincr

5、eased，bigholeswerethusformedinthePVAmatrix，resultinginadecreaseinthemembraneselectivity．WaterlocatedmostlyaroundthehydrophilicregionofthehydroxylgroupsofPVAchains；andhydrogenbondingWasformedbetweenwaterandPVA．WaterclusterswereformedintheswollenPVA，whereasethanolmoleculesdisperseda

6、lmostindividuallyinthePVAmatrix．HybridizationofPVAmembranebyCnH2n+lSi(OH)3decreasedthemobilityofPVAchains，increasedamorphousregioninPVAmatrix．BasedontheresultsofCnH2n+lSi(OH)3hybridizedPVAmembranesstudiedbymolecularsimulations，APTEOSandBT髓werechosentomodifythePVAmembranes．APTEOSan

7、dBTEEhybridizationadjustedthemicrostructureofthePVAmembranesandremarkablydecreasedthemobilityofPVAchainsFurthermore，solubilityanddiffusionbehaviorofwaterandalcoholinthePVA／APTEOShybridmembraneswerestudiedbyIGC．ItisnotedthatthehybridizationofPVAbyAPTEOSenhancedwaterpermeabilityofth

8、ePVAmembranesandtheirsorptionsele