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Microstructure of polyurethane ionomers derivatized with dodecylamine and polyethylene oxide in the hard segment
Author(s) -
Santerre J. P.,
Brash J. L.
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070520406
Subject(s) - polyethylene , polymer chemistry , differential scanning calorimetry , materials science , sulfonate , oxide , polyethylene oxide , grafting , microstructure , ethylene oxide , chemical engineering , polyurethane , alkyl , copolymer , polymer , chemistry , composite material , organic chemistry , sodium , physics , engineering , metallurgy , thermodynamics
Abstract Segmented polyether‐polyurethanes containing sulfonate groups in the hard segment were modified by the grafting of polyethylene oxide and C 12 hydrocarbon chains. The grafts were attached via the sulfonate groups. The physical properties of the materials, including stress–strain behavior, thermal behavior, and water uptake were studied. Grafting was found to alter material behavior significantly. Both the alkyl and polyethylene oxide grafts appear to alter the packing of the hard segments in microdomains because the grafted materials, in contrast to their sulfonated precursor, do not exhibit a melting transition. However, the polyethylene oxide chains appear to interact with the hard segments, probably through hydrogen bonding. For the C 12 grafted materials, differential scanning calorimetry showed that a third microphase, consisting largely of C 12 chains, may be formed by annealing. Stress–strain and water uptake data support these interpretations. The grafted materials were found to absorb more water than the sulfonated precursor. Most of the water taken up by the C 12 material appears to be bulk water whereas for the PEO materials the absorbed water behaves as if it is bound. © 1994 John Wiley & Sons, Inc.