Abstract
Thermoplastic interpenetrating polymer networks (IPN) are blends of two physically crosslinked polymers. These thermoplastic IPNs were prepared by melt blending an SBS triblock elastomer with a poly(styrene-co-sodium methacrylate) ionomer. Dynamic mechanical thermal analysis, electron microscopy and stress-strain analysis were used to probe the morphology of a range of compositions to assess the influence of mixing conditions, copolymer composition, molecular weight and degree of neutralization on morphology. These thermoplastic IPNs showed clear phase separation. The best mixing occurred under conditions where the two components were as near as possible to being isoviscous. Neutralization caused significant changes in morphology. The interpenetration of phases is clearly evident.
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