Ethylene-1-butene copolymers were prepared with SiO₂-supported TiCl₄ catalyst by changing of 1-butene/ethylene molar ratio in feed, and the resulting copolymers were analyzed using temperature rising elution fractionation (TREF) and crystallization fractionation (Crystaf) methods to investigate the influence of C₄/C₂ molar ratio in feed on chemical compositional distribution and other parameters such as molecular weight and its distribution. TREF analysis showed that the copolymers had a broad and bimodal chemical compositional distribution (CCD) regardless of the content of 1-butene in the copolymer. The chemical composition was in the range of 5 to 55 branches per 1,000 carbons for all copolymers prepared in the study. Furthermore, the broader CCD was revealed for the copolymers having the higher content of 1-butene. Crystaf analysis did not showed a bimodal CCD for the copolymers having the 1-butene content of less than 5.1 wt%. The lower crystalline part having higher 1-butene content in Crystaf analysis was less than that of TREF analysis.

中文翻译：

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非均相齐格勒-纳塔催化剂制备的乙烯-1-丁烯共聚物的化学组成分布：TREF和Crystaf分析

通过改变进料中1-丁烯/乙烯的摩尔比，用SiO ₂负载的TiCl ₄催化剂制备乙烯-1-丁烯共聚物，并使用升温洗脱分馏（TREF）和结晶分馏（Crystaf）方法分析所得共聚物研究C ₄ / C _2的影响饲料中的摩尔比对化学成分分布和其他参数（例如分子量及其分布）的影响。TREF分析表明，无论1-丁烯在共聚物中的含量如何，共聚物均具有较宽的双峰化学成分分布（CCD）。对于研究中制备的所有共聚物，化学成分范围为每1000个碳原子5至55个支链。此外，对于具有较高1-丁烯含量的共聚物，显示出更宽的CCD。Crystaf分析未显示出1-丁烯含量小于5.1重量％的共聚物的双峰CCD。在Crystaf分析中具有较高1-丁烯含量的较低结晶部分小于TREF分析的结晶部分。