摘要
——PhaseBehavioroftheAqueousSolutionofPoly(vinylmethylether)SensitivetoTemperatureandtheModificationoftheBehaviorbyUsingPoly(acrylicacid)Thephasebehavioroftheaqueoussolutionofpoly(vinylmethylether)(PVME)sensitivetotemperatureandthemodificationofthebehaviorbyusingpoly(acrylicacid)(PAA)havebeenstudiedbyultrasonicattenuationmeasurementsandfluorescenceprobetechniques.IthasbeenobservedthatPVMEsolutionistransparentatroomtemperatureandbecomesturbiduponheating.Thesolutionturnsclearagainassoonasthetemperatureisdecreasedtoroomtemperature.Theheatingandcoolingprocesscanberepeatedformanytimes.Thephasebehaviorofthesolutionsensitivetotemperatureisattributedtotheconformationalchangesofthepolymer.PVMEmayadoptanopencoilconformationatroomtemperature.Withthisconformation,thepolymeriswellmisciblewiththesolvent,water,andtherebythesystemisarealsolution.Thepolymermayadoptacompactcoilconformationwhenthetemperatureishigherthanaspecificvalue,whichiscalledtheLCST(thelowercriticalsolutiontemperature)ofPVME.Inthiscase,thepolymertanglestoeachotherandformsvariousaggregates,whichcanscatterincidentlightandultrasonicwavesgreatly,resultinginthephaseseparation.IntroductionofPAAdecreasesthetemperaturesensitivityofthephasebehaviorofthepolymer.ThenatureoftheinhibitionisattributedtothecomplexationofPAAwithPVMEandthestronghydrophilicityofPAA.Resultsfromfluorescenceprobestudiesareinaccordancewiththosefromultrasonicattenuationmeasurements,indicatingagainthattheultrasonicattenuationmethodcanbesuccessfullyusedforthequalitativestudiesofpolymerconformationsandcomplexationbetweenpolymers.
出版日期
2004年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
