Ziegler-Natta催化剂催化的丙烯/1-丁烯共聚:催化特性和动力学模型

In order to study the catalytic characteristics of multiple active centers and kinetic characteristics of Ziegler - Natta catalysts, an experiment on the copolymerization of propylene/1 - butene under its action was carried out. The apparent reactivity ratios of monomers were estimated to reflect the comonomer insertion ability, and the polymer molecular weight distribution was deconvoluted into Flory components. A dual active center model was proposed to describe the consumption rate of propylene during the polymerization process. The results show that with the increase of the initial feed concentration of 1 - butene, the polymerization activity first decreases and then increases; the polymer molecular weight decreases with the increase of the initial feed concentration of 1 - butene and slightly increases with the extension of the polymerization time. The Flory distribution function of five active centers is sufficient to describe the polymer molecular weight distribution. According to the kinetic characteristics, the active centers in the catalytic system are divided into two types, and this dual active center model can be very good... (最后一个“很好”后面似乎还有内容未给出)

为了研究Ziegler-Natta催化剂的多活性中心催化特性和动力学特性，进行了在其作用下的丙烯/1-丁烯共聚实验，估算了单体表观竞聚率以反映共单体插入能力，聚合物分子量分布去卷积成Flory组分，提出用双活性中心模型描述聚合过程中的丙烯消耗速率。结果表明，随1-丁烯初始进料浓度的提高，聚合活性先降低后增高；聚合物分子量随1-丁烯初始进料浓度的提高而降低、随聚合时间的延长而略微升高。五活性中心的Flory分布函数足够描述聚合物分子量分布，根据动力学特性将催化体系内活性中心分成两类，该双活性中心模型可以很好