4.6 Article

Synthesis and CO2 separation of novel polyurethane membranes containing urea linkages

Journal

JOURNAL OF APPLIED POLYMER SCIENCE
Volume 136, Issue 27, Pages -

Publisher

WILEY
DOI: 10.1002/app.47723

Keywords

differential scanning calorimetry (DSC); membranes; polyurethane; separation techniques; thermogravimetric analysis (TGA)

Funding

  1. National Natural Science Foundation of China [51572185]
  2. Key Laboratory of Low-Carbon Chemistry and Energy Conservation of Guangdong Province at Sun Yat-Sen University

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We synthesized novel polyurethane (PU) membranes from isophorone diisocyanate (IPDI), poly(ethylene glycol) (PEG) with a molecular weight of 2000, aminopropyl-terminated poly(dimethyl siloxane) (PDMS) with a molecular weight of 2000, and 1,4-butanediol (BDO) via a two-step polymerization. The structure of each synthesized membrane was studied through Fourier transform infrared spectroscopy and gel permeation chromatography. The effect of the thermal behavior was determined by differential scanning calorimetry and thermogravimetric analysis. The gas-permeability characteristics of the PU membranes were then tested for a single gas. The results show that the permeability of CO2 (P-CO2) gradually increased with PDMS content. Among these PU membranes, PU-d (PEG/PDMS=1:1, PEG/PDMS/IPDI/BDO=1:3:2) showed the best P-CO2 (132.6 Barrer) at 25 degrees C and 1 bar pressure. The gas-permeability coefficients of each PU membrane at different operating temperatures were investigated, and the results show that P-CO2 reached 302.6 Barrer at 65 degrees C and 1 bar. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47723.

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