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本文研究了催化剂的用量、单体的浓度、聚合温度等聚合条件对聚丁二烯的转化率、分子量以及链结构的影响。试验结果表明:这个催化剂的特点是催化剂用量极少,1,4-顺式含量高而且稳定,聚合速度太快,高聚物的分子量过大,因此进一步研究了聚合速度的控制和高聚物分子量的调节。已得到的结果是:(1)在不同溶剂中聚合的速度相差甚大。其快慢的顺序是,苯>甲苯>二甲苯>三甲苯。(2)添加一些如苯基-β-萘胺、N,N′-二苯基对苯二胺等胺类,既可减慢聚合速度,又能降低高聚物的分子量。(3)调节体系中水分的含量,控制高聚物的分子量。(4)利用二种溶剂混合的不同比例,调节高聚物的分子量。(5)加入少量的萘、蒽等稠环芳烃于庚烷溶剂中,则大大提高高聚物的分子量。对上述结果进行了讨论。
In this paper, the effects of the amount of catalyst, monomer concentration and polymerization temperature on the conversion, molecular weight and chain structure of polybutadiene were investigated. The experimental results show that the catalyst is characterized by very little amount of catalyst, high and stable 1,4-cis content, too fast polymerization rate and too high molecular weight of the polymer. Therefore, further studies on the control of the polymerization rate and the high polymer Regulation of molecular weight. The results obtained are: (1) The rate of polymerization in different solvents varies greatly. The order of its speed is benzene> toluene> xylene> trimethylbenzene. (2) Adding some amines, such as phenyl-β-naphthylamine, N, N’-diphenyl-p-phenylenediamine, can not only slow the polymerization rate but also reduce the molecular weight of the polymer. (3) adjust the moisture content of the system, control the molecular weight of the polymer. (4) Adjust the molecular weight of the polymer using different ratios of the two solvents. (5) adding a small amount of naphthalene, anthracene and other polycyclic aromatic hydrocarbons in heptane solvent, then greatly improve the molecular weight of the polymer. The above results are discussed.