降冰片烯开环易位聚合反应的分子量及分子量分布控制

使用Grubbs催化剂催化降冰片烯单体进行开环易位聚合反应, 研究了催化剂搅拌溶解时间、聚合反应的溶剂极性和三苯基膦的加入等反应条件对降冰片烯单体ROMP反应分子量及分子量分布的影响, 从而得到降冰片烯ROMP反应的最佳条件.

Molecular Weight and Molecular Weight Distribution Control of Ring-opening Metathesis Polymerization of Norbornene

Ring-opening metathesis polymerization of norbornene catalyzed by Grubbs catalyst [(PCy3)2·(Cl)2Ru=CHPh] was carried out. The results of 1H NMR demonstrated that the polymerization of the norbornene monomer proceeded by the ROMP mechanism. The molecular weight and molecular weight distribution of this reaction can be controlled by changing the stirring time of catalyst, choosing different solvents and the adding of PPh3 during the polymerization. The results show that stirring the catalyst for 15 min, using more polar solvent and adding 2 equiv of PPh3 can optimize the conditions of this reaction. The polydispersity indices(PDIs) of the poly(norbornene) were nearly monodisperse(PDIs about 1.18).