Citation: SUN Junquan, PAN Zhida, YANG Shilin. RING-OPENING POLYMERIZATION OF ε-CAPROLACTONE BY LANTHANOCENE CATALYSIS*[J]. Chinese Journal of Polymer Science, ;1998, 16(4): 297-303. shu

RING-OPENING POLYMERIZATION OF ε-CAPROLACTONE BY LANTHANOCENE CATALYSIS*

Received Date: 5 March 1997

Ring-opening polymerization of ε-caprolactone (CL) catalyzed bylanthanocenes, O(C2H4C5H3CH3)22YCl (Cat-YCl) and Me2Si[(CH3)3SiC5H3]2NdCl(Cat-NdCl) has been carried out for the first time. It has been found that both yttroceneand neodymocene are very efficient to catalyze the polymerization of CL, giving high molec-ular weight poly (ε-caprolactone) (PCL ). The effects of [cat] / [ε- CL] molar ratio, polymeriza-tion temperature and time, as well as solvents were investigated and polymerization temperature is found to be the most important factor affecting the polymerization.The bulk polymerization gives higher molecular weight PCL and higher conversion than that in solution polymerization.NaBPh4 was found to promote the polymerization of ε-caprolactone,and thus yo increase both the polymerization conversion and MW of poly(ε-caprolactone).
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