海藻酸铜膜表面的配位结构及催化MMA聚合的性能  

Coordination Structure of Copper Alginate Film and Its Catalytic Property for MMA Polymerization

作　　者：程贤甦[1] 关怀民[1] 苏英草[1] 

机构地区：[1]福建师范大学高分子研究所,福州350007

出　　处：《化学学报》2000年第4期407-413,共7页Acta Chimica Sinica

基　　金：福建省教委资助课题

摘　　要：将海藻酸钠(SA)与CuCl_2·2H_2O反应得到一种配位聚合物海藻酸铜(Cu-An).以ESR、电导率、IR和XPS方法对此配位聚合物进行表征,确定了组成与结构;同时研究了甲基丙烯酸甲酯(MMA)在该配位聚合物膜、HSO_3^-和水体系催化引发作用下的聚合反应历程.结果表明,配位聚合物的中心离子Cu^(2+)与两个海藻酸(An)链节单元上的两个羧羟基氧原子和两个离解氢原子的羧羟基氧原子以共价型配位,配位数为4.MMA在上述的催化引发体系中是按照自由基加聚反应历程进行聚合的,PMMA呈无规结构.Cu-An在催化引发体系中起着催化剂的配位催化作用.The film of copper alginate coordinated polymer was obtained by stirring sodium alginate film in a 15% CuCl2·2H2O solution. The copper alginate film was characterized by ESR spectroscopy, specific conductivity, IR spectrometry and XPS. Its composition and surface structure were determined. The catalytic property of copper alginate for polymerization of MMA was studied. The reaction mechanism of MMA polymerization in copper alginate and HSOf solution system is discussed. Experimental results show that the copper ion of copper alginate is coordinated with two carboxyl hydroxyl oxygen atoms and two deprotonic carboxyl hydroxyl oxygen atoms of two alginate units by covalent bond, the coordination number is four. The copper alginate is shown to be active at pH = 7 for catalyzing the polymerization. The copper alginate serves as catalyst in coordination catalysis. MMA polymerized by free radical addition polymerization and the PMMA obtained possessed random structure.

关 键 词：海藻酸 配位聚合物 海藻酸铜 MMA 自由基聚合 

分 类 号：TQ316.334[化学工程—高聚物工业]