镧配位催化N-十八烷基马来酰亚胺均聚合

N-取代马来酰亚胺聚合物中的酰亚胺环为平面五元环结构，阻碍了酰亚胺单元绕聚合物主链的旋转，限制了聚合物主链的运动，使聚合物的热性能和化学稳定性得到了很大的提高．近些年来，有关N-取代马来酰亚胺均聚合研究的报道已经有很多，但大多采用自由基聚合方法和负离子聚合方法，采用配位催化聚合方法很少．

POLYMERIZATION OF N-OCTADECYLMALEIMIDE WITH LANTHANUM RARE EARTH COORDINATION CATALYST

Polymerization of N-Octadecylmaleimide was studied using rare earth coordination catalysts in toluene.The dependence of polymerization on molar ratio of catalyst components,different rare earth elements,catalyst concentration,monomer concentration,polymerization time and polymerization temperature was investigated in detail.The results showed that the rare earth catalysts were favorable catalysts for the polymerization of N-Octadecylmaleimide.A suitable condition for the polymerization was [La(P_(507))_3]= 1×10~(-2)?mol·L~(-1);([Al(i-Bu)_3])=8.0×(10~(-2)?mol·L~(-1));[NODMI]=5.0×(10~(-1)?mol·L~(-1));60℃;6?h.Characterization of the polymer obtained showed that polymerization of N-Octadecylmaleimide proceeded via opening the double bond in the monomer molecules.The heat-resistant property of the polymer was investigated primarily.The polymer showed excellent thermal stability.The thermal decomposition of the polymer proceeded via a one-step reaction and no substantial weight loss was observed below 350℃.The initial decomposition temperature(T_(ini)) was 360℃,the maximum decomposition temperature(T_(max)) was 441℃,and the residual weight at 500℃ was about(3.4?wt%).