Polymerizations of 1,4-Dioxan-2-one Initiated by AlEt3-M(AcAc)n-H2O Systems

Abstract

Abstract: New initiator systems for the ring-opening polymerization of 1,4-dioxan-2-one (PDO), AlEt₃-M(AcAc)_n-H₂O, where M=Nd, La, Zn, Fe, Co and Ni, were used to initiate the ring-opening polymerization of PDO in bulk, and to synthesize poly(1,4-dioxan-2-one)(PPDO) with high molecular weights within very short reaction time. A high conversion of monomer can be reached. Of all those initiator systems, AlEt 3-Nd(AcAc)₃-H₂O is the best one. The effects of n(Al):n(Nd) and n(H₂O):n(Al) on the polymerization of PDO were investigated. It was found that n(AlEt₃): n[Nd(AcAc)₃]:n(H₂O)=8:1:4 could obtain the best initiating effects. PPDO with a viscosity-average molecular weight of 3.1×10⁵ can be obtained when n(PDO):n[AlEt₃-Nd(AcAc)₃-H₂O] is 2 000, the reaction temperature 80℃, and the reaction time 24 h. Meanwhile, a high conversion of 94.7% can be reached.

Key words: AlEt 3-Nd(AcAc)₃-H₂O, Ring-opening polymerization, Biodegradation, Poly(1,4-dioxan-2-one)

CLC Number:

O631

TrendMD:

GUO Yue-Hai, WANG Yu-Zhong, YANG Ke-Ke, WANG Xiu-Li, ZHOU Qian . Polymerizations of 1,4-Dioxan-2-one Initiated by AlEt₃-M(AcAc)_n-H₂O Systems[J]. Chem. J. Chinese Universities, 2004, 25(9): 1765.

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Polymerizations of 1,4-Dioxan-2-one Initiated by AlEt₃-M(AcAc)_n-H₂O Systems

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