异戊二烯/甲基丙烯酸甲酯嵌段共聚物的合成与微结构研究

• 作 者: 郑荣华 张一烽 沈之荃
• 机 构: 浙江大学高分子科学与工程系
• 出 处: 高分子学报
• 发表日期: 1999年01期
• 关键词: 嵌段共聚物 稀土催化剂 共聚合反应 异戊二烯 玻璃化转变温度 微结构特征 结构规整 二溴乙烷 交替共聚物 丙烯酸酯类

用稀土催化剂ＲＥ（Ｐ２０４）３（ｉＢｕ）３ＡｌＢｒＣＨ２ＣＨ２Ｂｒ（ＲＥ＝Ｎｄ，Ｐｒ，Ｙ等）合成嵌段共聚物Ｐ（ＩＰｂＭＭＡ）．系统考察了共聚合反应特征，以ＤＳＣ，１ＨＮＭＲ，１３ＣＮＭＲ技术研究了该嵌段共聚物的微结构．发现以二溴乙烷为添加剂的稀土催化体系是制备Ｐ（ＩＰｂＭＭＡ）的良好催化剂，共聚物含２个玻璃化转变温度，分别为－７５６℃和１２９℃，嵌段共聚物的结构规整，（ＩＰ）ｍ段以ｃｉｓ１，４结构为主，其含量为９７％左右，３，４结构为３％左右，链节间以头尾方式连接．（ＭＭＡ）ｎ段以间同立构为主，其含量达７４％．

The block copolymer P (IPbMMA) was synthesized by using rare earth catalyst RE (P204) 3 (iBu) 3AlBrCH2CH2Br (RE = Nd, Pr, Y, etc.) The copolymerization reaction system was investigated systematically. The microstructure of the block copolymer was studied by DSC, 1H-NMR and 13C-NMR techniques. It was found that dibromoethane as a rare earth catalyst system is a good catalyst for the preparation of P (IPbMMA). The copolymer contains two glass transition temperatures of -756 ℃ and 129 ℃, respectively. Block copolymerization The structural regularity of the material, (IP) m section to cis-1,4 structure, the content of about 97%, 3,4  structure of about 3%, the link between the head  tail connection. (MMA) n segment to the main symbiosis, its content of 74%.