Summary
Interpenetrating polymer networks (IPN's) of a combination of polyurethane (PU) and poly(styrene-co-acrylonitrile) (PSAN) were prepared by the simultaneous polymerization process. To observe the relative rate effect of the simultaneous polymerization, the polymerization kinetics of PU and PSAN were studied. The gel-times of PU and PSAN network were theoretically calculated, and three types of SIN's with different rates of network formation in each component were prepared for comparison. IPN's with Mc=3000 and Mc=4900 were prepared to observe the influence of the crosslink density. The glass transition behavior studied by the dynamic mechanical analysis showed larger shifts in Tg's in SIN's with similar gel-times and smaller Mc.
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Park, I.H., Lee, J.H. & Kim, S.C. Dynamic mechanical properties of interpenetrating polymer networks of polyurethane and poly(styrene-co-acrylonitrile). Polymer Bulletin 10, 126–133 (1983). https://doi.org/10.1007/BF00275845
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DOI: https://doi.org/10.1007/BF00275845