AbstractElastomeric latex interpenetrating polymer networks (IPNs) can result from a two‐stage emulsion polymerization procedure in which styrene is polymerized and cross‐linked on a lightly cross‐linked polyacrylate (PA) seed latex in a ratio of 75 : 25 PA‐PS. The multiphase nature of these IPNs is indicated by two distinctTgs and is confirmed by cold‐stage transmission electron microscopy and by the unique mechanical and rheological properties that are intimately related to the material's structure. PS microdomains reinforce the elastomeric PA, yielding a significant modulus, and interparticle PS physical ties yield a significant ultimate tensile strength. The elastomeric latex IPN's dual thermoset‐thermoplastic nature is revealed in a stick, slip, roll flow mechanism of the cross‐linked submicrometer particles, which can be injection molded as a thermoplastic. The relationships among the polymerization procedure, the structure, and the physical properties are characterized by the examination of several different materials using a variety of analyt
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