Structure-property relationships in thermoplastic pseudo-interpenetrating polymer networks. I. Phase morphology
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Grigoryeva, OP
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Sergeeva, LM
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Privalko, EG
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Kyritsis, A
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Zimich, ON
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Privalko, VP
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Pissis, P
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Shtompel, VI
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Pseudo-thermoplastic interpenetrating polymer networks (p-TIPNs) prepared by mechanical mixing of a crystallizable polyurethane (CPU) and styrene/acrylic acid random copolymer (S/AA) were characterized by specific heat capacity measurements in the temperature interval 133-433 K, as well as by wide-angle and small-angle X-ray scattering. It was established that: 1. Crystallizability of BAG is the main cause of microphase-separated morphology of CPU. 2. Limited miscibility of CPU with S/AA significantly affects the phase morphology of p-TIPNs on their base. Mixed microphase of fixed composition [CPU/(S/AA) = 90/10] and essentially pure microphase of S/AA are the main structural entities in as-quenched samples of p-TIPNs of whatever nominal composition. More complex phase morphology (that is, coexistence of essentially pure microphases of crystallized BAG and of S/AA, and of the mixed CPU/(S/AA) microphase enriched with S/AA) is expected for initial samples.
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