论文部分内容阅读
以丙烯酸、丙烯酰胺、2-丙烯酰胺基-2-甲基丙磺酸作为混合单体,Span-80和Tween-60作为复合乳化剂、采用氧化还原引发体系在常温下引发聚合,制备了稳定的超浓反相聚合物乳液,同时制备了低分散相体积分数的普通乳液及由普通乳液离心得到的超浓反相聚合物乳液作为对比研究.用显微镜观察了乳胶粒的形态,统计计算了乳胶粒粒径分布,用动态流变学方法、超声稳定性以及热稳定性等手段研究了这些乳液的稳定性.对比研究发现直接合成的超浓乳液胶粒粒径具有普通乳液没有的特征双峰分布的结构,进而提出了小尺寸胶粒的“楔子”效应模型,用该模型解释了超浓乳液稳定性,用动态流变学、超声稳定性和热稳定性等研究并证实了该小尺寸胶粒的“楔子”效应.
Using acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid as the mixed monomer, Span-80 and Tween-60 as the composite emulsifier, the redox initiator system was used to initiate the polymerization at room temperature to prepare a stable Of the ultra-concentrated polymer emulsion, prepared at the same time low-dispersion volume fraction of the ordinary emulsion and ordinary emulsion centrifugation obtained super-concentrated polymer emulsion as a comparative study with a microscope to observe the shape of the latex particles, calculated statistically Latex particle size distribution, the dynamic rheological method, ultrasonic stability and thermal stability of the stability of these emulsions were studied.Comparative study found that the direct synthesis of ultra-concentrated latex particle size with ordinary emulsion does not have the characteristics of double Peak distribution structure, and then put forward a “wedge ” effect model of small size particles, using the model to explain the stability of ultra-concentrated emulsion, with the dynamic rheology, ultrasonic stability and thermal stability studies and confirmed The “wedge ” effect of the small size of the particles.