缩醛化乙烯醇-丙烯酸钠共聚物的合成及温敏性质  

Preparation and Temperature Sensitivity of Acetalyzed Poly(vinyl alcohol-co-sodium acrylate)

作　　者：潘远凤[1] 肖惠宁[1] 蔡平雄[2] 何北海[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640 [2]华东理工大学材料科学与工程学院超细材料制备与应用教育部重点实验室,上海200237

出　　处：《精细化工》2008年第4期324-328,共5页Fine Chemicals

基　　金：2006年度广东省高等学校自然科学研究重点项目(No.06Z002);第四十批中国博士后科学基金一等资助金(No.20060400220);华南理工大学博士后创新科学基金(No.2006)~~

摘　　要：首先合成了室温下可溶于水的聚乙烯醇-丙烯酸钠共聚物(PVA-co-AANa),然后部分缩醛后得到一系列不同缩醛度(DA)、不同相对分子质量和单体组成的高分子材料(APVA-co-AANa),该材料具有温敏性。用FTIR和1HNMR表征了其结构。通过APVA-co-AANa水溶液在不同温度的浊度测定,考察了母体PVA-co-AANa相对分子质量、DA和单体组成对APVA-co-AANa的低临界溶解温度(LCST)的影响,发现APVA-co-AANa的DA越高、分子链越长、AA组分用量越小,相对LCST越低。而且,APVA-co-AANa水溶液还表现出盐敏性,LCST随NaCl用量增加而降低。APVA-co-AANa膜的AFM表面形貌的变化也证实了APVA-co-AANa的温敏性。Poly（ vinyl alcohol-co-sodium acrylate） （PVA-co-AANa） ,which is soluble in water at room temperature,was prepared,and a series of temperature-sensitive acetalyzed PVA-co-AANa （ APVA-co- AANa） with different degrees of acetalation （DA）, chain lengths and contents of comonomer were synthesized. FTIR and ^1HNMR technique were used to analyze their structures. The turbidities of APVA-co-AANa aqueous solutions at different temperatures reveal that their lower critical solution temperatures（LCST） can be affected by the molecular weight of starting PVA-co-AANa, DA and contents of comonomer. Lower LCST is observed when the APVA-co-AANa possesses a longer chain, higher DA or less acrylate content. Besides,the LCSTs of APVA-co-AANa aqueous solutions show salt sensitivity. The LCST decreases with the increase of NaCl concentration. Moreover, the AFM images of APVA-co-AANa also prove their temperature-sensitivity.

关 键 词：温敏性 聚乙烯醇 缩醛 低临界溶解温度 功能材料 

分 类 号：TQ314.269[化学工程—高聚物工业]