Ring-opening Polymerization of Lactones Catalyzed by Rare Earth Compounds(Ⅲ)──Bulk Polymerization of ε-Caprolactone with Neodymium Chloride-Epoxide System

Abstract

Abstract: Bulk polymerization of ε-caprolactone(CL) with neodymium chloride-epoxide sys tem has been studied. It was found that the addition of epoxide can greatly increase the catalytic activity of neodymium chloride. The catalytic activity sequence of NdCl₃ combined with epoxide is: NdCl₃-ethylene oxide > NdCl₃-proplene oxide > NdCl₃-epichlorohydrin≈NdCl₃-allyl glycidyl ether. The catalytic activity of NdCl₃-proplene oxide system increases,but molecular weight of resulting polycaprolactone(PCL) decreases at higher proplene oxide/ neodymium chloride molar ratio.The molecular weight of PCL can be controlled by catalyst concentration. Higher polymerization temperature can greatly increase the catalytic efficien cy. At 30℃, PCLwith molecular weight as high as 28. 9×10⁴can be prepared easily with an activity of 44×10⁴g PCLper molar neodymium, and at 60℃, the molecular weight of PCLand catalytic efficiency increased to 42×10⁴and 10⁶g PCL/mole Nd respectively.

Key words: Neodymium chloride, Epoxide, ε-Caprolactone, Bulk polymerization

CLC Number:

O643.36

TrendMD:

SHEN You-Qing, SHEN Zhi-Quan, SHEN Jian-Liang, ZHANG Fu-Yao, ZHANG Yi-Feng. Ring-opening Polymerization of Lactones Catalyzed by Rare Earth Compounds(Ⅲ)──Bulk Polymerization of ε-Caprolactone with Neodymium Chloride-Epoxide System[J]. Chem. J. Chinese Universities, 1995, 16(5): 820.

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Ring-opening Polymerization of Lactones Catalyzed by Rare Earth Compounds(Ⅲ)──Bulk Polymerization of ε-Caprolactone with Neodymium Chloride-Epoxide System

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