Influence of the longest ethylene and isotactic propylene sequences on crystallization elution fractionation of ethylene/propylene copolymers,The Canadian Journal of Chemical Engineering

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Influence of the longest ethylene and isotactic propylene sequences on crystallization elution fractionation of ethylene/propylene copolymers
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2023-06-19 , DOI: 10.1002/cjce.25030
Voradon Voraruth ₁ , Siripon Anantawaraskul _{1,

2} , Saeid Mehdiabadi ₃ , João B. P. Soares ₃

Affiliation

Crystallization elution fractionation (CEF) is the newest crystallization-based technique for estimating the chemical composition distribution of ethylene/1-olefin copolymers. Understanding the separation mechanism of CEF for ethylene/propylene copolymers over their full compositional range is challenging because the crystallizabilities of the copolymer chains depend on the longest ethylene sequence and on longest isotactic propylene sequence. We developed a mathematical model to describe the CEF mechanism for ethylene/propylene copolymers over the entire compositional range using population balances for the crystallization and dissolution stages. The joint distribution of longest ethylene and isotactic propylene sequences determines how the copolymer populations crystallize and dissolve. The model was validated with experimental CEF profiles of ethylene/propylene copolymers varying from pure ethylene to propylene homopolymers.

中文翻译：

最长乙烯和全同立构丙烯序列对乙烯/丙烯共聚物结晶洗脱分级的影响

结晶洗脱分级 (CEF) 是最新的基于结晶的技术，用于估算乙烯/1-烯烃共聚物的化学成分分布。了解乙烯/丙烯共聚物在整个组成范围内的 CEF 分离机制具有挑战性，因为共聚物链的结晶性取决于最长的乙烯序列和最长的全同立构丙烯序列。我们开发了一个数学模型来描述乙烯/丙烯共聚物在整个成分范围内的 CEF 机制，使用结晶和溶解阶段的群体平衡。最长乙烯和全同立构丙烯序列的联合分布决定了共聚物群体如何结晶和溶解。

更新日期：2023-06-19

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