多糖與蒙脫土的納米插層及其在吸水性樹脂中的應用.pdf

1、天津大學博士學位論文多糖與蒙脫土的納米插層及其在吸水性樹脂中的應用姓名：邱海霞申請學位級別：博士專業(yè)：應用化學指導教師：于九皋20040601ABSTRACTThewatersolutionintercalationofthreekindsofpolysaccharidesuchassodiumcarboxymethylcellulose(CMC)chitosan(CS)andalginate(AL)tomontmorillonite(

2、MMT)werestudied.ThestructureofpolysacchrideMMTcompositeswerecharacterizedbyXRDTEMandIR.TheresultsindicatethatCMCCScanintercalateintoMMTsheetsALcannotintercalateintoMMTsheetsduetotheformationofgelbetweenalginateandMMT.ALM

3、MTnanocompositecanbepreparedonlyafterdivalentcationsfromMMTwerereplacedbyNasuficientlyinNaClsolution.ComparingtoCMCCSandALfilmsthetensilestrengthofCMCMMTCSMMTandALMMTnanocompositewereimprovedandthewatervaporpermeabilityw

4、eregreatlyshutdownwhichhaspracticalmeritsforpolysacchrideinediblefilms.PAAPolysacchrideMMTcompositewerepreparedbyintroductingpolysaccharideMMTcompositeintoacrylicacidpolymerizationsolutionPAACMC(orCS)MMTcompositeswerecha

5、racterizedbyXRDTEMandIRwhichrevealedthatMMTsheetshadbeendispersedinnanolevelinPAAmatrixandthereexitedstronginteractionbetweenPAAandCMC(orCS)MMTcomposites.SEManalysisindicatesthegoodcompatibilitybetweenPAAandALMMT.Theefec

6、tofpolymerizationfactorsaswellasreactionconditionsofpolysaccharideandMMTonthewaterabsorbencyofPAApolysacchrideMMTcompositeswerediscussedsystematically.Otherwaterabsorbentpropertiessuchaswaterretentionabilityundernatureco

7、nditionswaterabsorbencyafterheatingetcwereindicatethatcomparedtoPAAALMMTcompositesPAAthewaterabsorbencyofwereincreasedandthewatermeasured.TheresultsPAACMCMMTandabsorbencyofPAACSMMTcompositesweredecreasedslightly.Thewater

8、retentionabilityofPAApolysaccharideMMTcompositesundernatureconditionweregreatlyimproved.ThephotostabilityofPAAandPAApolysaccharideMMTcompositeswerestudied.TheresultsexhibitthatcomparewithPAAPAACSMMTandPAAALMMTcompositesh

9、avegoodphotostabilityandPAACMCMMTcompositeshowspoorphotostability.SwellingkineticsofPAACMC(orCS)MMTcompositescouldbedescribedwithasecondorderrateequationwhilePAAALMMTcompositefollowexponentialheuristicequationswellingkin