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1、中文摘要在水介質(zhì)中，以過硫酸鉀(KPS)引發(fā)丙烯酸乙酯(EA)與羥丙基甲基纖維素(HPMC)的接枝共聚合，反應(yīng)歷程與經(jīng)典乳液聚合相似?？疾炝朔磻?yīng)溫度、單體濃度、預(yù)接觸時間、鏈轉(zhuǎn)移劑異丙醇(IPA)等對接枝率、接枝效率的影響。接枝率在反應(yīng)溫度為65℃時達到最大，而隨反應(yīng)溫度升高，接枝效率始終是降低的；延長KPS與HPMC的預(yù)接觸時間、提高單體濃度有利于提高接枝率與接枝效率；引入鏈轉(zhuǎn)移劑IPA會降低接枝率與接枝效率，但有助于得到穩(wěn)定的高固含量的乳液。采用IR、DSC對接枝共聚物進行了表征。在DSC譜圖上，HPMC與PEA的玻璃化溫度(T。)相互靠近，表明其相容性提高，接枝共聚物HPMC．g
2、．PEA是兩者的增容劑。當接枝率較低時，材料的相容性較差，其力學性能也較差。引入功能性含胺單體甲基丙烯酸二甲氨基乙酯(DM)參與接枝共聚，可以賦予產(chǎn)物在酸性介質(zhì)中溶解的性能，但也會降低單體的轉(zhuǎn)化率以及接枝率、接枝效率。此外，KPS的分解速率也顯著提高，在60℃下，KPS的分解反應(yīng)符合2級反應(yīng)，半衰期<1min。關(guān)鍵詞：羥雨基甲基纖維素；(甲基)丙烯酸酯；乳液；接枝共聚合ABSTRACTGraftcopolymerizationofethylacrylate(EA)ontohydro。ypropyImethylcellulose(HPMC)wascarriedoutbytheriseof
3、potassiumpersulfate(KPS)initiatorinaqueousmedium．Amechanism，whichresembledthatofclassicemulsionpolymerization，wasproposed．Theextentofgraftpolymerformationwasmeasuredintermsofgraftingpercentandgraftingefficientasfunctionsofreactiontemperature，monomerconcentration，pre—interacting，timeandisopropano
4、l(IPA)．Graftingpercenthadmaximumattemperatureof65℃．a(chǎn)ndgraftingefficiencydecreasedastemperatureincreased．Longerpre—interactingtimebetweenKPSandHPMCandhighermonomerconcentrationresultedinhighergraftingpercentandgraftingefficiency．TheeffectofIPAontheextentofgraftpolymerformationwasa]soexamined．Stab
5、lehigh—solid—contentemulsionwasobtainedinthepresenceofIPA．TheformationofgraftcopolymersweFeconfirmedbyIRandDSC，Theglasstransitiontemperatures(Tg)ofHPMCandPEAapproachedeachotherduetotheimprovedcompatibilitywithHPMC·-g-·PEAasacompatibilizer．Thegraftcopolymerswithlowlevelofgraftingpercentexhibitedb
6、admechanicalpropertiesduetopoorcompatibility．ItwasfoundthattheextentofgraftpolymerformationonHPMCwasappreciablyreducedbythepresenceofDM．ItwasinterpretedasduetOthechaintransfereffectofDM．AninterestingdiscoverywasthedramaticallyaccelerationofdecompositionofKPS，withthereactionrateshowed2一orderwithr
7、especttotheconcentrationofKPSandahalf-time0f1essthan1minat60℃WaSobserved．Keywords：11ydroxypropylmethylcellulose；(meth)acrylate；emulsion；graftcopolymerization獨創(chuàng)性聲明本人聲明所呈交的學位論文是本人在導(dǎo)師指導(dǎo)F進行的研究工作和取得的研究成果，除了文中特別加以標注和致謝之處外，論文中不包含其他
