甲基丙烯酸己磺酸钠的等离子体射发聚合与嵌段共聚合

PLASMA-INITIATED POLYMERIZATION AND BLOCK GOPOL- YMERIZATION OF SODIUM SULFOHEXYL METHACRYLATE

等离子体引发聚合是七十年代发展起来新的聚合方法。其特点是获得超高分子量的聚合物,且在许多情况下是活性聚合,因此,可用于合成嵌段共聚物,和接枝共聚物以及一些特殊性能的高聚物材料,如絮凝剂、固定化酶等。但并不是所有的单体都能进行等离子体引发聚合,因此,对于此种聚合的活性和反应机理的研究引起了极大的兴趣。前文报道了甲基丙烯酸己磺酸钠(SSHMA)水溶液等离子体引发聚合动力学条件以及所得聚合物的结晶形态。

Very thick slurry of sodium sulfohexyl methacrylate (SSHMA) with little amount of water was plasma-initiated and polymerized. The mechanism and kinetics of plasma-initiated polymerization of SSHMA were preliminarily studied. The existence of macromolecular 'living' chains were ascertained by experiments. Thus, SSHMA-acrylic acid block copolymers were obtained by adding acrylic acid to livingSSHMA segments. The ESR results suggest that propagating radicals CH2C(CH3)CO-O(CH2)6 SO3Na might be present in the SSHMA system initiated by plasma. It was found that no 'living' chains were present in the SSHMA system initiated by either UV light or radical initiators under the same conditions.