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Mechanical and morphological study of polyurethane/polystyrene interpenetrating polymer networks containing ionic groups
Author(s) -
Hourston Douglas J.,
Schäfer FranzUlrich,
Walter Nicholas J.,
Gradwell Michael H. S.
Publication year - 1998
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/(sici)1097-4628(19980321)67:12<1973::aid-app3>3.0.co;2-k
Subject(s) - dynamic mechanical analysis , materials science , interpenetrating polymer network , ionic bonding , polyurethane , scanning electron microscope , polymer , viscoelasticity , ionomer , methacrylic acid , polymer chemistry , phase (matter) , dynamic modulus , polystyrene , morphology (biology) , composite material , copolymer , chemical engineering , chemistry , ion , organic chemistry , biology , engineering , genetics
The viscoelastic and mechanical properties and the morphology of polyurethane (PUR)/ olystyrene (PS) interpenetrating polymer networks (IPNs) containing ionic groups have been investigated. Dynamic mechanical thermal analysis (DMTA) revealed a pronounced change in the viscoelastic properties upon the introduction of ionic groups. For the 70 : 30 and 60 : 40 PUR/PS IPN compositions, the DMTA data changed from a dominant PUR to a dominant PS loss factor peak. Higher intertransition loss factor values indicated a significant improvement of IPN component mixing with increasing ionic content. The stress at break values increased only moderately, whereas sharp rises in Young's modulus and hardness values were found at 2 wt % ionic groups. At the same time, the strain at break values decreased by half. Scanning and transmission electron microscopy (TEM) indicated a grossly phase‐separated morphology for the 70 : 30 PUR/PS IPN without ionic groups. With increasing methacrylic acid (MAA) content, the PS phase domain sizes decreased. At 2 wt % of ionic groups, a TEM micrograph showed interconnected PS phase domains resembling a network structure. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1973–1985, 1998