Enhanced characterization of the chemical structure of high-density polyethylene by size exclusion/thermal fractionation on poly(styrene-co-divinylbenzene) columns

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization Pub Date : 2023-01-01 DOI:10.1080/1023666X.2022.2154907

A. Boborodea , P. Boulens

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引用次数: 0

Abstract

Following the recent trends in polymer analysis, a novel fractionation method was developed using xylene as an alternative to trichlorobenzene (TCB) and offering a more exhaustive characterization of the chemical structure of high-density polyethylene (HDPE). The method is based on a linearized evaporative light scattering detector (LinELSD), which has a much better signal-to-noise for the solutions of HDPE in xylene, as compared with the traditional differential refractive index (DRI) and infrared (IR) detectors. The low viscosity of xylene opens the possibility to use the poly(styrene-co-divinylbenzene) (PS-DVB) columns not only for gel permeation chromatography (GPC) but also for temperature-rising elution fractionation (TREF). An immediate application is the simultaneous measurement of the wax fraction’s content and molecular weight (MW) in HDPE. Furthermore, there are strong indications that the thermogram profile corresponding to the isothermal extraction at 70 °C provides a fingerprint of the HDPE synthesis catalyst.

查看原文本刊更多论文

在聚苯乙烯-二乙烯基苯色谱柱上采用粒径排除/热分馏技术对高密度聚乙烯的化学结构进行了表征

根据聚合物分析的最新趋势，开发了一种新的分馏方法，使用二甲苯作为三氯氢苯（TCB）的替代品，并对高密度聚乙烯（HDPE）的化学结构进行了更详尽的表征。该方法基于线性化蒸发光散射检测器（LinELSD），与传统的差分折射率（DRI）和红外（IR）检测器相比，该检测器对HDPE在二甲苯中的溶液具有更好的信噪比。二甲苯的低粘度打开了使用聚（苯乙烯-共-二乙烯基苯）（PS-DVB）柱的可能性，不仅用于凝胶渗透色谱（GPC），而且用于升温洗脱分馏（TREF）。一个直接的应用是同时测量HDPE中蜡馏分的含量和分子量（MW）。此外，有强有力的迹象表明，与70°C等温提取相对应的热谱图提供了HDPE合成催化剂的指纹。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Polymer Analysis and Characterization 化学-高分子科学

CiteScore

3.50

自引率

5.30%

发文量

审稿时长

1.6 months

期刊介绍： The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.