Diene polymers or copolymers having improved raw polymer viscosity and reduced hysteresis in the cured and carbon black reinforced state are provided. These diene polymers or copolymers are prepared by a method which involves first terminating substantially all of the living diene polymer or copolymer chains obtained by anionic polymerization with a compound having multiple-bonded nitrogen atoms selected from the group consisting of aromatic nitriles and substituted imines having the formula
and then coupling a portion of the resultant terminated polymer chains with a polyfunctional reagent selected from the groups consisting of silicon polyhalides, polyisocyanates, phosphoryl halides and polycarboxylic acid halides.
本发明提供的二烯聚合物或共聚物在固化和
炭黑增强状态下具有更高的原始聚合物粘度和更低的滞后性。这些二烯聚合物或共聚物的制备方法是:首先用一种具有多个键合氮原子的化合物将阴离子聚合得到的活的二烯聚合物或共聚物链基本上全部终止,该化合物选自芳香族腈和取代
亚胺组成的组,其式为
然后将所得端接聚合物链的一部分与多官能试剂偶联,该多官能试剂选自由
硅多卤化物、多
异氰酸酯、
磷酰卤化物和多
羧酸卤化物组成的组。