Citation: 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, 14(4): 324-329. shu

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

SUN Junquan ,
WU Lanting

Received Date: 25 May 1995

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 higher than that in solution polymerization,but the polymerization rate in melt was lower than in solution.The molecular weight distribution (MWD)of PLA is broader with increasing temperature.X-ray study indicated that PLA obtained by Nd(AcAc)3 in melt polymerization is an amorphous polymer.
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