合成了水杨醛亚胺中性镍配合物和二乙烯基乙酰丙酮铑催化体系.研究了水相中催化乙烯的聚合,用差示扫描量热法、广角X射线衍射、核磁共振、动态流变性能以及动态力学性能表征水相聚合所得聚乙烯(PE)和乙烯共聚物.乳化剂十二烷基硫酸钠可使乙烯在水相中的聚合活性从17.7 kg/(mol·h)提高到27.9 kg/(mol·h)；PE是支化度很低的线型高相对分子质量PE,熔体呈假塑性流体特征；水相中乙烯与1-辛烯和1-癸烯共聚合后的结晶结构与均聚PE一致,但结晶度下降,水相中共聚物含量增加.%A catalyst system consisting of salicylaldiminato neutral nickel(II )complex(Ia) and divinyl acetyl acetone rhodium[Rh(acac)(C2H4)2] was synthesized and used to catalyze ethylene polymerization in water. The catalytic polymerization of ethylene in water was studied. The homo-polyethylene and ethylene copolymer prepared in water were characterized by differential scanning calorimetry (DSC), wide angle X-ray diffractometry(WAXD), nuclear magnetic resonance(NMR) and dynamic rheometer. The polymerization activity of ethylene in water increased from 17.7 kg/(mol-h) to 27.9 kg/(mol*h) with the help of sodium dodecyl sulfate as emulsifier. The polyethylene prepared with la and cyclodextrin in water possessed linear molecular chains with higher relative molecular mass and a less branched structure. The polyethylene melt exhibited the feature of pseudoplastic fluid. The crystal structure of copolymers of ethylene with octene or decene prepared in water was similar to that of the homo-polyethylene. The copolymer content in the aqueous phase increased since the crystallinity of the copolymers decreased.
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