Comparison of High-Temperature HPLC, CRYSTAF and TREF for the Analysis of the Chemical Composition Distribution of Ethylene-Vinyl Acetate Copolymers

被引：23
作者：
Albrecht, Andreas [1 ,2 ]
Bruell, Robert [1 ]
Macko, Tibor [1 ,2 ]
Malz, Frank [1 ]
Pasch, Harald [1 ,3 ]
机构：
[1] German Inst Polymers DKI, D-64289 Darmstadt, Germany
[2] Dutch Polymer Inst, NL-5600 AX Eindhoven, Netherlands
[3] Univ Stellenbosch, Inst Polymer Sci, ZA-7602 Matieland, South Africa
来源：
MACROMOLECULAR CHEMISTRY AND PHYSICS | 2009年 / 210卷 / 16期
关键词：
CRYSTAF; ethylene-vinyl acetate copolymers; FT-IR; liquid chromatography; polyolefins; TREF; CRYSTALLIZATION ANALYSIS FRACTIONATION; POLYETHYLENE; SEPARATION; POLYMERS; BLENDS;
D O I：
10.1002/macp.200900135
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The chemical composition distribution (CCD) is a fundamental molecular parameter of copolymers. High-temperature interactive liquid chromatography (HT-HPLC) has recently emerged as a new analytical technique for determination of the CCD of semicrystalline copolymers of ethylene and polar comonomers. With the aim of comparing the results of HT-HPLC with those from the traditionally used temperature rising elution fractionation (TREF) and crystallization analysis fractionation (CRYSTAF) techniques, three ethylene-vinyl acetate (EVA) copolymers were fractionated by TREF and the fractions were analyzed by HT-HPLC. HT-HPLC-Fourier transform-infrared (FT-IR) spectroscopy showed that individual fractions of different VA-content coelute in the HPLC. While the separation in TREF and CRYSTAF is mainly the result of the overall effect of alkyl branches and VA-comonomer units, in HT-HPLC it is the polar comonomer that selectively contributes to the adsorption. Thus, HT-HPLC leads to a much more detailed knowledge of the distribution of the structured units; in addition, it saves time.
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页码：1319 / 1330
页数：12
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