洗脱
分馏
凝胶渗透色谱法
化学
差示扫描量热法
乙烯
结晶
单体
共聚物
1-丁烯
微观结构
色谱法
分析化学(期刊)
材料科学
高分子化学
聚合物
有机化学
催化作用
物理
热力学
结晶学
作者
Zhenkang Zhang,Yanhu Xue,Rui Li,Wei Liu,Shuang He,Xiangling Ji
标识
DOI:10.1002/macp.202300180
摘要
Abstract TREF (temperature rising elution fractionation) is a method to separate resins based on crystallizability. The influence of TREF cooling rate (V 0 ) on the fractionation process is still unclear. Herein, a poly(1‐butene‐ co ‐ethylene) resin is fractionated by the TREF method at three different cooling rates (1, 2, and 4 °C h −1 ), and then the fractions are analyzed by high‐temperature gel permeation chromatography (HT‐GPC), differential scanning calorimetry (DSC), and 13 C‐nuclear magnetic resonance spectroscopy ( 13 C‐NMR). The cooling rate V 0 affects the crystallization process of the PB‐1 resin, resulting in different fraction contents at the same elution temperature. Furthermore, the cooling rate also affects the chain microstructure of fractions obtained from the same elution temperatures, i.e., the content of 1‐butene and ethylene monomer units, average sequence length and isotacticity. The lower cooling rate is beneficial to the effective separation of the fractions with weak crystallizability. These results have important guidance for optimizing fractionation conditions and obtaining different narrow distribution fractions of poly(1‐butene) (PB‐1) resin.
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