摘要
New initiator systems for the ring-opening polymerization of 1,4-dioxan-2-one (PDO), AlEt 3-M(AcAc) n-H 2O, 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-H 2O is the best one. The effects of n(Al)∶n(Nd) and n(H 2O)∶n(Al) on the polymerization of PDO were investigated. It was found that n(AlEt 3)∶ n[Nd(AcAc) 3]∶n(H 2O)=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[AlEt 3-Nd(AcAc) 3-H 2O] is 2 000, the reaction temperature 80 ℃, and the reaction time 24 h. Meanwhile, a high conversion of 94.7% can be reached.
New initiator systems for the ring-opening polymerization of 1,4-dioxan-2-one (PDO), AlEt 3-M(AcAc) n-H 2O, 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-H 2O is the best one. The effects of n(Al)∶n(Nd) and n(H 2O)∶n(Al) on the polymerization of PDO were investigated. It was found that n(AlEt 3)∶ n[Nd(AcAc) 3]∶n(H 2O)=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[AlEt 3-Nd(AcAc) 3-H 2O] is 2 000, the reaction temperature 80 ℃, and the reaction time 24 h. Meanwhile, a high conversion of 94.7% can be reached.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第9期1765-1767,共3页
Chemical Journal of Chinese Universities
基金
教育部跨世纪优秀人才基金和国家"八六三"计划项目 (批准号 :2 0 0 2 AA3 2 2 0 3 0 )资助
