摘要
采用半连续加料乳液聚合方法制备了硅溶胶/聚丙烯酸酯核/壳结构聚合物,采用动态光散射方法跟踪了复合乳胶粒的粒径随反应进程的变化,其理论粒径与实测值基本一致,说明该聚合过程没有明显的二次成核过程。考查了壳层硬单体——甲基丙烯酸甲酯(MMA)含量对乳液聚合的影响,通过动态热机械分析仪(DMA)对聚合物的黏弹性能进行了表征,对制成的胶粘剂进行了压敏特性的测定,并与复合粒子的分子结构进行了关联。研究表明,随着MMA含量的增加,压敏胶的初粘性略有下降,而持粘性显著提高,剥离强度呈先升后降的趋势。
Nanocomposite core-shell polyacrylate/silica sol latexes used for pressure sensitive adhesives were prepared by semi-continuous emulsion polymerization. Comparison of theoretically calculated particle diameters with those measured experimentally showed that the particles had grown without significant secondary nucleation occurring. Effect of different MMA content in the shell layer （PBA） on the adhesive properties of polyacrylate/silica sol latexes was measured. The results showed that the shear resistance increased significantly with the increase of MMA content in the shell layer, while the loop tack decreased. The relationship between pressure-sensitive properties and molecular parameters, such as glass transition temperature and storage modulus, was evaluated.
出处
《粘接》
CAS
2009年第8期46-49,共4页
Adhesion
关键词
乳液聚合
核/壳聚合物
硅溶胶
甲基丙烯酸甲酯
压敏胶
emulsion polymerization
core-shell polymer
methyl methacrylate
silica sol
pressure sensitive adhesive
