Abstract

cis-1,4-Polyisoprene was prepared under conditions of the industrial production process using small high-performance diffuser–confuser tubular turbulent apparatuses in the stage of formation of titanium, neodymium, and gadolinium Ziegler–Natta catalysts, and characteristics of the synthesized rubber were determined. The catalytic systems can be ranked in the following order with respect to the content of cis-1,4-units in the synthesized polyisoprene: titanium (96.3%)–neodymium (97.5%)–gadolinium (99%); the polyisoprene obtained on lanthanide catalysts contains no trans-1,4-units. The mean molecular masses of polyisoprene increase in the same order, whereas the polydispersity coefficient varies insignificantly. Natural rubber compared to synthetic analogs contains virtually no thermally stable compounds, is characterized by higher surface microhardness, and contains about 1% volatiles.

中文翻译：

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湍流改性钛和镧系催化剂在大吨位生产工艺条件下获得的立体有规顺-1,4-聚异戊二烯的特性

摘要

在钛、钕和钆齐格勒-纳塔催化剂的形成阶段，使用小型高性能扩散器-干扰器管式湍流装置在工业生产过程条件下制备顺式-1,4-聚异戊二烯，以及合成橡胶的特性被确定。根据合成聚异戊二烯中顺式1,4-单元的含量，催化体系可以按以下顺序排列：钛（96.3%）-钕（97.5%）-钆（99%）；在镧系元素催化剂上获得的聚异戊二烯不含反式1,4-单位。聚异戊二烯的平均分子量以相同的顺序增加，而多分散系数变化不大。与合成类似物相比，天然橡胶几乎不含热稳定化合物，具有更高的表面显微硬度，并含有约 1% 的挥发物。