Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (4): 20210865.doi: 10.7503/cjcu20210865

• Analytical Chemistry • Previous Articles     Next Articles

Separation and Characterization of Polymer Blends Using Online Ultra-high Performance Liquid Chromatography-Size Exclusion Chromatography

WANG Mingfang1, FU Hua2, FU Zhibo1, WANG Yuerong1, ZHANG Hongyang1, ZHANG Min3, HU Ping1()   

  1. 1.Shanghai Key Laboratory of Functional Materials Chemistry,School of Chemistry & Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China
    2.School of Chemistry Engineering,Qinghai University,Xining 810016,China
    3.Shanghai Key Laboratory of New Drug Design & Modern Engineering Center for TCM,School of Pharmacy,East China University of Science and Technology,Shanghai 200237,China
  • Received:2021-12-28 Online:2022-04-10 Published:2022-03-03
  • Contact: HU Ping E-mail:huping@ ecust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(81973285)

Abstract:

The characterization of polymer blends is a difficult problem in adhesives and coatings industry, and the studies on the separation of complex mixtures are always popular. In this paper, an online ultra-high performance liquid chromatography-size exclusion chromatography(UHPLC-SEC) system was designed and set up. The solvent compatibility and orthogonality of the two-dimensional chromatography system were investigated using the hydroxyl polybutadiene(HTPB). The applicability of the two-dimensional chromatography was studied in the separation and characterization of each fraction from the styrene-butadiene block copolymer(SBS), styrene-isoprene block copolymer(SIS) and polymethacrylate(PMMA) blends. The results showed that the molecular weight and distribution of HTPB were determined by UHPLC-SEC, which were consistent with those determined by SEC. The peak molecular weight(Mp), the weight average molecular weight(Mw) and the polymer dispersity index(PDI) of HTPB were 3407 Da, 6573 Da and 2.36, respectively, and the relative standard deviations(RSDs) were less than 5.7%. Moreover, the solvent compatibility and orthogonality of the system were good. Compared to the existing SEC method, the relative errors of MpMw and PDI of PMMA, SBS and SIS fraction measured by UHPLC-SEC were all less than 7.1%. The PMMA remained stable after the mixture of PMMA, SBS and SIS was heated at 200 ℃ for 3 h, while SBS and SIS components degraded significantly. Due to the good accuracy and reproducibility of the UHPLC-SEC method in the characterization of the polymer blends, it is suitable for the failure analysis of the polymer formulations.

Key words: Ultra-high performance liquid chromatography, Size exclusion chromatography, Two-dimensional chromatography, Polymer blend

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