期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 337, 期 1-2, 页码 25-32出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2011.01.009
关键词
Salen-type Schiff base transition metal or mixed metal complex; Bulk solvent-free melt ring-opening polymerization; L-Lactide
资金
- National Natural Science Foundation of China [20871098]
- State Key Laboratory of Structural Chemistry [20100014]
- Provincial Key Item of Shaanxi
- Graduate Innovation and Creativity Funds [08YZZ48]
- Graduate Cross-discipline Funds [09YJC23]
- Northwest University in PR China
A monometallic (Ni2+, 1) and a series of bimetallic (Ni2+-Ln(3+), Ln = Ce (2); Ln = Nd (3); Ln = Sm (4); Ln = Eu (5); Ln = Tb (6); Ln = Ho (7); Ln = Tm (8)) complexes based on the Salen-type Schiff-base ligand H2L (H2L=N,N'-bis(3-methoxysalicylidene)ethylene-1,2-diamine) were synthesized and characterized by EA, FT-IR, ESI-MS and X-ray crystallography. The catalysis results showed that the two kinds of complexes with different active species, could efficiently catalyze the bulk solvent-free melt ring-opening polymerization (ROP) of L-lactide with moderate molecular weights and narrow molecular weight distributions. Especially for the series of bimetallic complexes 2-8, the involvement of rare ions effectively passivated the catalytic behaviors on the ROP of L-lactide, while was in favor of the increase of polymeric molecular weights (M-w, or M-n) and the polymerization controllability, and the type of rare ions was important and influential factor contributing to the catalytic behaviors. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据