A syndiotactic styrenic polymer having a narrow molecular weight distribution which is a (co)polymer comprising at least one structural unit represented by the following Formula (1):
wherein C1 of a phenyl group thereof has a tacticity of 30% or more in terms of a racemic pentad determined by 13C-NMR, and Ra and m are as defined in the specification. The disclosure is also directed to a block copolymer comprising the above polymer as one segment, to a block graft polymer prepared by modifying one block of the above polymer with a nitrogen-containing aromatic polymer, and to a process for preparing a syndiotactic styrenic polymer in which a styrenic monomer is polymerized in the presence of a catalyst comprising a reaction product of a transition metal compound and at least one co-catalyst selected from organic aluminunoxy compounds.
一种具有窄分子量分布的协聚物或共聚物,其包括至少一个由以下
化学式(1)表示的结构单元:其中其苯基的C1具有在13C-NMR确定的外消旋五元组中的30%或更高的立体异构性,而Ra和m如规范中所定义。该公开还涉及将上述聚合物作为一个片段的嵌段共聚物,通过将上述聚合物的一个块与含氮芳香族聚合物进行修饰而制备的块状接枝聚合物,以及制备
丁二烯基单体存在下,使用由过渡
金属化合物和
有机铝氧化合物中至少一种协催化剂的反应产物作为催化剂的方法制备协聚物的过程。