| THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST |
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| 作者姓名： | 孙俊全 吴兰亭 |
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| 作者单位： | Department of Polymer Science and Engineering，Zhejiang University Hangzhou 310027，Department of Polymer Science and Engineering，Zhejiang University Hangzhou 310027 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China and the Laboratory of Rare-earth Chemistry and Physics,Changchun Institute of Applied Chemistry,Academia Sinica |
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| 摘 要： | (D, L)-Lactide (LA) was first polymerized with one component of rare earth cata-lysts Nd(naph)_3, Nd(oct)_3, Nd(O-iPr)3, Nd(AcAc)_3, Y(AcAc)_3, Sm(AcAc)_3, Er(AcAc)_3)]respectively in solution and in melt state. The effects of Cat]/LA] molar ratio, solvents,polymerization time, temperature, various rare earth elements and ligands were investi-gated in detail. The results showed that both the conversion of polymerization and themolecular weight (MW) of poly (D, L-Lactide) (PLA) in melt polymerization are higherthan that in solution polymerization, but the polymerization rate in melt was lowr than insolution. The molecular weight distribution (MWD) of PLA is broader with increasing tem-perature. X-ray study indicated that PLA obtained by Nd(AcAc)_3 in melt polymerizationis an amorphous polymer.
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| 收稿时间： | 1995-05-25 |
THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST* |
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| SUN Junquan,WU Lanting.THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST[J].Chinese Journal of Polymer Science,1996,0(4):324-329. |
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| Authors: | SUN Junquan WU Lanting |
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| Institution: | Department of Polymer Science and Engineering; Zhejiang University Hangzhou 310027 |
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| Abstract: | (D, L)-Lactide (LA) was first polymerized with one component of rare earth cata-lysts Nd(naph)_3, Nd(oct)_3, Nd(O-iPr)3, Nd(AcAc)_3, Y(AcAc)_3, Sm(AcAc)_3, Er(AcAc)_3)]respectively in solution and in melt state. The effects of Cat]/LA] molar ratio, solvents,polymerization time, temperature, various rare earth elements and ligands were investi-gated in detail. The results showed that both the conversion of polymerization and themolecular weight (MW) of poly (D, L-Lactide) (PLA) in melt polymerization are higherthan that in solution polymerization, but the polymerization rate in melt was lowr than insolution. The molecular weight distribution (MWD) of PLA is broader with increasing tem-perature. X-ray study indicated that PLA obtained by Nd(AcAc)_3 in melt polymerizationis an amorphous polymer. |
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| Keywords: | Ring-opening polymerization (D L)-Lactide Poly (D L-Lactide) Rare earth catalyst |
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