Nd（P_（507））_3－Al（i－Bu）_3催化马来酸酐与环氧丙烷开环交替共聚

Ring-Opening Alternating Copolymerization of Maleic Anhydride and Propylene Oxide by Nd(P_(507))_3-Al(i-Bu)_3

本文研究了马来酸酐和环氧丙烷交替共聚，发现Ｎｄ（Ｐ_（５０７））_３－Ａｌ（ｉ－Ｂｕ）_３是马来酸酐（ＭＡｎ）和环氧丙烷（ＰＯ）交替共聚的良好催化剂，并用红外光谱，核磁共振谱研究了共聚物的结构。

The characteristics and product structure of alternating copolymerization of propylene oxide with maleic anhydride catalyzed by Nd(P_(507))_3-Al(i-Bu)_3 is presented and discussed in the present paper.The structure of the copolymer is studied with IR and NMR. The copolymer is a product of high alternation. there is more than 44% maleic anhydride in the copolymer by calculating the ratio of peak area of 1H- NMR from the copolymer obtained from different monomer ratio. The copolymerization can be realized in the solvents such as aromatic hydrocarbon and alkane. The yield and[η]are higher in aromatic hydrocarbon than in other solvents. In benzene, the yield is 68.4%,[η]=8.6×10-2 dl/g.The way of adding the raw materials to the reaction system influences the yield. The better order is MAn→sol.→PO→cat. The more suitable concentraction of catalysts is[Nd]=1. 0×10-2 mol/l,[Al]/[Nd]=6 8. The higher is the temperature of copolymerization,the higher are the yield and[η]. The more suitable temperature is 60 70℃.