聚N异丙基丙烯酰胺聚丙烯酸响应性互穿聚合物网络微凝胶的合成及表征

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1、东华大学硕士学位论文聚（N-异丙基丙烯酰胺）/聚（丙烯酸）响应性互穿聚合物网络微凝胶的合成及表征姓名：陈文才申请学位级别：硕士专业：纳米纤维及杂化材料指导教师：梁伯润20071201东华大学硕上学位论文积相转变温度(VPTT)为32．2。C。当温度高于25。C，该类微凝胶容易聚集。当AAc用量为0．8ml时，在pH=4的条件下呈现传统PNIPAM微凝胶的“热缩性”温敏特性，不会产生聚集；同时具有明显的pH响应性。关键词：N一异丙基丙烯酰胺，丙烯酸，温度／pH敏感微凝胶，互穿网络II东华人学硕十学位论文SynthesisandCharacterizationofS

2、ensitivePoly(N·isopropylacrylamide)／Poly(acrylicacid)IPNMicrogelsAbstractInrecentyears，therehaveconsiderableresearchattentionbeenfocusedonthepreparationofnovelresponsivemicrogelsbecauseoftheirwideapplicationsinmanyfields，suchasdrugcontrolledrelease，environmentalcleanup，separation，and

3、colloidalcrystals，．etc．Amongthem，thetemperature-andpH—responsivemicrogelshaveattractedgreatinterestfrombothscientificandindustrialcommunitiesatpresent．Therefore，inthisthesis，weintendtoprepareaseriesofnoveltemperature—andpH-sensitivemicrogelsbasedonNIPAMandAAcviasurfactant．freeemulsio

4、npolymerizationandinterpenetratingnetworktechnique．Thestructureandpropertiesofthesehydrogelswerepreliminarilyexplored．Themainresultsachievedareasfollows：1,Thenoveltemperature-·andpH-·sensitivesemi·-interpenetratingnetwork(semi—IPN)microgelswerepreparedviathepreparationofthetemperatur

5、e-sensitivelinearpoly(N—isopropylacrylamide)(PNIPAM)bysurfactant—freeemulsionpolymeri-zationandthenintroducingtheotherpH-sensitivepoly(acrylicacid)(PAAc)networkintothepolymerbyinterpenetratingtechnique．Theresultsfromthestudyofstructureandpropertiesprovedthatboththecomponentswereexist

6、edinasemi—IPNstructurewhichhadgoodtemperature·andpH-sensitivity．Atacidiccondition，thesehydrogelsexhibited“thermo．inducedcontraction”behaviorsimilartothetraditionalPNIPAMhydrogel．AtalkalescentconditionandthetemperaturebelowtheVPTTofPNIPAMmicrogel(≈32。C)，thediameterofthemicrogelparticl

7、esincreasedwithelevatingtemperatureuntilreacheduptotheVPTT．andthentendedtodecreaseastheIII东华大学硕Ij学位论文temperaturetobefurtherelevated．Italsoshowedthatthemicrogelswereeasytowardaggregationatstrongacidiccondition．2，Thenoveltemperature-andpH-sensitiveIPNmicrogelswerepreparedviathepreparat

8、ionofthetemp