含丁二烯结构单元的低聚物存在下镍系催化剂用量对顺丁橡胶支化结构的影响  

Effects of amount of Ni-based catalyst on branching structure of cis-1,4-polybutadiene in the presence of oligomer with butadiene units

作　　者：李丰晓[1] 李培培 LI Feng-xiao;LI Pei-pei(Rubber Plant of Qilu Branch,SINOPEC,Zibo 255400,China)

机构地区：[1]中国石化齐鲁分公司橡胶厂,山东淄博255400

出　　处：《合成橡胶工业》2020年第4期335-335,共1页China Synthetic Rubber Industry

基　　金：Supported by Shandong Provincial Natural Science Foundation(ZR 2016 EMM 03)

摘　　要：在Ni(naph)2(Ni)-Al(i-Bu)3(Al)-BF3·OEt2(B)三元催化丁二烯聚合体系中加入单体质量分数3%的含丁二烯(Bd)结构单元的低聚物,研究了催化剂各组分配比对单体转化率、胶液黏度和聚合物支化度的影响。结果表明,低聚物的存在会增加聚合物的支化结构,导致其分子量下降、胶液黏度降低,凝胶质量分数小于0.5%。固定Ni-Al-B催化剂中其他组分的用量,增大Ni与Bd的摩尔比,聚合物的支化程度先提高后降低,Al与B的增大会提高支化度。In this paper,branching cis-1,4-polybutadiene(BR)can be fabricated by the introduction of the structural regulators in the initial stage of reaction with the nickel-based catalytic system consisting of nickel naphthenate(Ni)-triisobutyl aluminum(Al)-boron trifluoride(B).Furthermore,the effects of the amount of catalyst and the introduction of structural regulators[SR,low molecular weight polymer with butadiene unit mole fraction of 70%and relative molecular mass(Mn)of 4000]in the initial stage of reaction on the Mn,solution viscosity and branching degree of the resulting polymers were investigated.

关 键 词：顺丁橡胶 镍系催化剂 溶液黏度 支化结构 

分 类 号：TQ333.2[化学工程—橡胶工业]