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>Semi‐ and fully interpenetrating polymer networks based on polyurethane‐polyacrylate systems. IX. Properties of an isomerically related interpenetrating network
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Semi‐ and fully interpenetrating polymer networks based on polyurethane‐polyacrylate systems. IX. Properties of an isomerically related interpenetrating network
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机译：Semi‐ and fully interpenetrating polymer networks based on polyurethane‐polyacrylate systems. IX. Properties of an isomerically related interpenetrating network
AbstractTwo polyurethane–poly(vinyl acetate) interpenetrating polymer networks of differing composition were synthesized and certain physical properties investigated. The results are compared with semi‐1‐interpenetrating polymer networks of the same system as well as with, where appropriate, polyurethane‐poly(methyl acrylate) interpenetrating polymer networks. Dynamic mechanical analysis clearly indicated phase separation for both compositions. The poly(vinyl acetate) glass transition showed a shift to lower temperatures accompanied by a shift to higher temperatures of the polyurethane transition. Such shifts indicate a certain extent of mixing. Electron microscopy confirmed phase separation and for a material with 20 by weight of polyurethane indicated that both components are continuous. This latter material also had a higher tensile strength and elongation at break than the corresponding poly(vinyl acetate) homopolymer. At 60 by weight of polyurethane the stress‐strain characteristics are those of a reinforced rubber. Certain modulus–composition theories, and, also, sonic velocity measurements were consistent with these morphological
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