POLYMERIZATION OF γ-STEARYL-α,L-GLUTAMATE N-CARBOXYANHYDRIDE USING RARE EARTH COORDINATION CATALYSTS

• 来源期刊: 高分子科学（英文版）
• 年，卷（期）: 2000,（4）
• 页码范围: 369-372
• 页数: 4页
• 语种: 英文

摘要

A rare earth coordination system was first investigated as a new type of catalyst for the ring-opening polymerization of α-amino acid N-carboxyanhydrides (NCAs). The results for the polymerization of γ-stearyl-α,L-glutamate (SLG) NCA using neodymium acetylacetonate (Nd(acac)3)- or neodymium tris(2-ethylhexylphosphonate) (Nd(P204)3)-triethylaluminum-water as catalysts were compared with those using conventional catalysts. It was found that the helical poly(γ-stearyl-L-glutamate) with high molecular weight as well as narrow molecular weight distribution can be obtained in the presence of Nd(acac)3/AlEt3-1/2H2O. The polymer obtained was characterized by IR and NMR spectroscopy.