THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST*

SUN Junquan; WU Lanting

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THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST*

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- THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST*
- Vol. 14, Issue 4, Pages: 324-329(1996)
- Affiliations：
  
  1. Department of Polymer Science and Engineering
  2. Zhejiang University Hangzhou 310027
- Author bio：
- Funds：
- DOI：
  CLC： TQ316.33
- Published：20 December 1996
- Accepted：
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[1]孙俊全,吴兰亭.THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST[J].Chinese Journal of Polymer Science,1996,{4}(04):324-329.

SUN Junquan, WU Lanting. THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST*[J]. 1996, 14(4): 324-329.
[1]孙俊全,吴兰亭.THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST[J].Chinese Journal of Polymer Science,1996,{4}(04):324-329. DOI：

SUN Junquan, WU Lanting. THE RING-OPENING POLYMERIZATION OF D,L-LACTIDE WITH ONE COMPONENT RARE EARTH CATALYST*[J]. 1996, 14(4): 324-329. DOI：

摘要

正

（D

L）-Lactide （LA） was first polymerized with one component of rare earth cata-lysts [Nd（naph）

Nd（oct）

Nd（O-iPr）3

Nd（AcAc）

Y（AcAc）

Sm（AcAc）

Er（AcAc）

)]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）

in melt polymerizationis an amorphous polymer.

Abstract

L)-Lactide （LA） was first polymerized with one component of rare earth cata-lysts [Nd（naph）

Nd（oct）

Nd（O-iPr）3

Nd（AcAc）

Y（AcAc）

Sm（AcAc）

Er（AcAc）

)]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

in melt polymerizationis an amorphous polymer.

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