核壳型聚丙烯酸酯塑溶胶的流变及凝胶行为研究  

Study on rheological and gelation properties of polyacrylate plastisol with core-shell structure

作　　者：宋晓丽[1] 程增会[1] 陈日清[1] 刘玉鹏[1] 王春鹏[1,2] 

机构地区：[1]中国林业科学研究院林产化学工业研究所,生物质化学利用国家工程实验室,国家林业局林产化学工程重点开放性实验室,江苏省生物质能源与材料重点实验室,南京210042 [2]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《化工新型材料》2014年第9期115-118,共4页New Chemical Materials

基　　金：中国林业科学研究院林业新技术研究所中央级公益性科研院所基本科研业务费专项资金(CAFINT2010K04)

摘　　要：采用半连续种子乳液聚合法,保持壳层玻璃化转变温度(Tg)不变的情况下制备了3种不同核层Tg(分别为57℃、67℃、77℃)的聚丙烯酸酯乳液。用旋转流变仪研究了核层Tg及填料CaCO3对塑溶胶流变及凝胶固化行为的影响并用动态光散射(DLS)、扫描电镜(SEM)分别对乳胶粒子的粒径大小及分布、粒子形貌和塑溶胶的胶膜表面进行表征。测试结果表明:增塑后体系黏度随着剪切速率的增大而减小,呈假塑性流体特性;壳层Tg不变的情况下,核层Tg越高增塑后体系对应的凝胶点温度越高;随着填料CaCO3添加量的增加,增塑后体系粘弹性都增大,但凝胶点温度不会发生改变。Keeping glass transition temperature of shell unchanged,core-shell polyacrylate latex with different glass transition temperature of core（ 57℃, 67℃, 77℃） were prepared by semicontinuous seed emulsion copolymerization. The effect of glass transition temperature of core and cotent of filler calcium carbonate on rheological and gelati0n behavior were investigated by rotational rheometer. Dynamic light scattering（DLS）and scanning electron microscopy（SEM）were used to observe morphology, size of latex particle and surface of plastisol film. The results showed that plasticized system viscosity decreased with shear rate increasing, which showed a pseudoplastic behavior. With increasing the glass transition temperature of core, plasticized system presented a higher gel temperature. Additionally, plasticized system presented a bigger viscosity and a constant gel point temperature with increasing the content of calcium carbonate.

关 键 词：聚丙烯酸酯 塑溶胶 流变 凝胶 CACO3 

分 类 号：O631.21[理学—高分子化学]