【作者】 刘海英； 顾继友； 邸明伟； 徐小军；

【Author】 LIU HaiYing~1,GU JiYou~1,DI MingWei~1,XU XiaoJun~2 (1 College of Material Science and Engineering,Northeast Forestry University Harbin, 150040;2 Zoltrix Materrial International Limited,Guang Zhou,511470)

【机构】 东北林业大学材料科学与工程学院； 昶联金属材料应用制品有限公司；

【摘要】 采用半连续种子乳液聚合法,合成含有纳米SiO₂粒子的聚醋酸乙烯酯（PVAc）杂化乳液,利用扫描电子显微镜（SEM）、粒度分析仪、力学性能试验机、动态力学分析仪（DMA）和流变仪等仪器,表征了杂化乳液的微观形态、粒径及分布宽度、粘接性能、乳液胶膜的模量及玻璃化转变温度和吸水率、流变特征。SEM照片显示SiO₂粒子经超声处理后加入后乳胶颗粒分散均匀;粒径在实验范围内为0.68～0.89μm,分布宽度随SiO₂加入量的增大而增大;SiO₂加入后可提高乳液的粘接强度;DMA分析结果显示SiO₂加入后胶膜的模量提高,玻璃化转变温度变化不明显,胶膜的吸水率降低;流变数据结果得出乳液的稠度系数K在加入SiO₂后呈现先增大后降低的趋势,流动指数n在实验范围内均小于1,呈现假塑性流体的特征。更多还原

【Abstract】 Polyvinyl acetate（PVAc） hybrid emulsions with nanoparticles SiO₂ were prepared by the semi-continuous seeding emulsion polymerization.Morphology of the latex particles and diameter and distributions were characterized with the aid of scanning electron microscope（SEM） and diameter analyzer.Adhesive capacity of hybrid emulsion and properties of films were determined by mechanical properties tester and dynamic mechanics analyzer（DMA）.And rheological behavior of hybrid emulsion was measured via rheometer.SEM and diameter analysis showed that the process of the nanoparticles SiO₂ by ultrasonic made a good dispersibility of latex particles in emulsion, diameter was 0.68～0.89μm with the content of SiO₂ from 0 to 1.0%（W/W=SiO₂/VAc）,and index of diameter distributions was increased with the increasing of the content of SiO₂ from 0 to 1.0%. Adhesive strength of PVAc emulsion modified with nanoparticles SiO₂ was improved.DMA results indicated that PVAc/SiO₂ films had the more storage modulus than PVAc of the film,temperature of glass transition of PVAc/ SiO₂ films were not changed obviously,and absorption water were decreased.Rheological results revealed that flow consistency index was increased then decreased with the increasing of the content of SiO₂ from 0 to 1.0%,and PVAc hybrid emulsion with nanoparticles SiO₂ were typical pseudoplastic fluid.更多还原