以丙烯酸十八酯作为疏水单体,在65 ℃,15 MPa压力下,用超临界CO2作为反应介质制备了疏水改性聚丙烯酸.所得共聚物为白色固体粉末,粒径分布均匀,扫描电镜显示颗粒大小约0.2 μm.酸碱滴定法测得其组成比与投料比相近.均聚物与共聚物水溶液的粘度特性结果表明,所制备的共聚物质量分数为2%的水溶液加入NaOH溶液后,呈现出强烈的缔合作用,粘度急剧增大,且具有触变性和良好的抗盐性.
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