当前位置: X-MOL 学术Macromol. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Chemical compositional distribution of ethylene-1-butene copolymer prepared with heterogeneous ziegler-natta catalyst: TREF and crystaf analysis
Macromolecular Research ( IF 2.8 ) Pub Date : 2009 , DOI: 10.1007/bf03218865
Young Soo Ko , Jong-Ki Jeon , Jin-Heong Yim , Young-Kwon Park

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:

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。
更新日期:2020-09-14
down
wechat
bug