用简易凝胶渗透色谱柱研究氯醇橡胶

用简易GPC柱研究了三种类型氯醇弹性体的分子量分布。装柱填料是多孔硅胶球。理论塔板数2000块/米以上。用三异丁基铝-磷酸-水-二甲基苯胺催化剂制得的均聚氯醇胶比用三异丁基铝-磷酸-苯并噻唑亚磺酰胺所得氯醇胶分子量分布宽,宽度指数在3—6之间。均聚氯醇胶在素炼过程中,分子量分布变窄,分子量变低。转化率增加,单体浓度增加或温度降低使分布变宽。催化剂中的二甲基苯胺对三异丁基铝克分子比影响二元共聚胶的分布宽度。

STUDY OF THE MOLECULAR WEIGHT DISTRIBUTION OF THE EPICHLOROHYDRIN ELASTOMER BY MEANS OF A SIMPLE GPC COLUMN

The molecular weight distribution of three kinds of epichlorohydrin elastomers has been studied by using a simple GPC colum. The column is packed with porous silica beads with an efficiency of more than 2000 plates per metre. It has been shown that the molecular weight distribution of the epichlorohydrin homopolymer made by the catlyst system of i-Bu3Al-H3PO4-H2O dimethyaniline is broader than that made by the catalyst system of i-Bu3Al-H3P04-benzothiazole sulfenamide. The polydis-persity is between the range of 3-6. The molecular weight distribution becomes narrower and the molecular weight is lowered during the milling of the elastomer. The polydispersity increased with the increase of conversion, the increase of monomer concentration, the decrease of polymerization temperature. The change of the molar ratio of dimethylaniline to the catlyst greatly effects the polydispersity of the copolymer.