Relation between network structure and gas transport in crosslinked poly(propylene glycol diacrylate)

Roy D. Raharjo, Haiqing Lin, David F. Sanders, Benny D. Freeman, Sumod Kalakkunnath, Douglass S. Kalika

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


A series of crosslinked poly(propylene oxide) rubbers was prepared by UV photopolymerization of poly(propylene glycol) diacrylate (PPGDA) in the presence of varying amounts of poly(propylene glycol) methyl ether acrylate (PPGMEA). The polar ether oxygen linkages in the resulting copolymers interact favorably with CO2, imparting a high selectivity for CO2 over light, non-polar gases as required for CO2 separation applications. The introduction of mono-functional PPGMEA in the polymerization reaction mixture resulted in the insertion of short side branches along the copolymer network and a corresponding reduction in the effective crosslink density; the concentration of propylene oxide (PO) segments in the networks ranged from 60 to 85 wt.%, depending upon the initial reaction composition. The effect of PPGMEA content on the mass density, free volume, and viscoelastic relaxation properties of the polymer networks was studied, and these results were related to the gas transport performance of the rubbery films. Permeability measurements (35 °C) are reported for H2, N2, CH4, CO2, C2H6, and C2H4; solubility and diffusivity data are presented for CH4, CO2, C2H6, and C2H4. The physical and gas transport characteristics of the crosslinked PPGDA polymers were compared with those obtained for rubbery networks based on poly(ethylene glycol) diacrylate.

Original languageEnglish
Pages (from-to)253-265
Number of pages13
JournalJournal of Membrane Science
Issue number1-2
StatePublished - Oct 20 2006

Bibliographical note

Funding Information:
We gratefully acknowledge support of this work by the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy (grant no. DE-FG03-02ER15362). The research was also supported by the United States Department of Energy National Energy Technology Laboratory under a subcontract from Research Triangle Institute through their prime contract no. DE-AC26-99FT40675. This paper was prepared with partial support from the U.S. Department of Energy, under award no. DE-FG26-01NT41280. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the DOE. Partial support from the U.S. National Science Foundation under grant no. CTS-0515425 is also acknowledged. Research conducted at the University of Kentucky was supported in part by a grant from the Kentucky Science and Engineering Foundation as per Grant Agreement KSEF-148-502-05-130 with the Kentucky Science and Technology Corporation.


  • Carbon dioxide
  • Dynamic mechanical
  • Gas permeation
  • Poly(propylene glycol) diacrylate
  • Solubility selectivity

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science (all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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