半连续和间歇式丙烯酸酯三元乳液共聚产物的形态及分子结构研究

研究了半连续和间歇式丙烯酸酯三元乳液共聚产物的形态和分子结构。结果表明,半连续式胶乳粒子呈“多核核壳结构”,其粒径和粒径分布随单体滴加速度减慢而变小。间歇式胶乳粒径较大,粒径分布亦更宽,呈硬相在外的“单核核壳结构”;共聚物分子链中VAc结构单元的序列较长。两种方法所获无规共聚物均存在微相分离结构,分离程度随单体滴加速度的加快而变大。

The Morphology and Molecular Structure of Acrylate Tri-Copolymer Prepared by Semi-Continuous and Batch Process of Emulsion Polymerization

The morphology and molecular structure of acrylate emulsion tri-copolymer prepared by both semi-continuous and batch process were : studied. The results: revealed that in semi-continuous copolymerzation process, the particle size and size distribution became larger and wider when import speed of monomers increased, whereas batch one had maximum values of particle size and distribution. For latex polymermerized by batch method, the macromolecular chain with different monomer sequence lengths and distribution existed in the particles, forming "single core-shell structure" , on the - other handy molecular chain of copolymer with homogeneous distrbution of structure units tangled in the particles made by semi-continuous process, forming "multi-core-shell structure" . The synthesized random copolymers revealed microphase separation structure, the faster the import speed of monomers, the greater the separated degree, and it reached a maximum level in batch copolymer.