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Structure-Property Relationships in Thermoplastic Pseudo-Interpenetrating Polymer Networks. I. Phase Morphology |
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| Authors: | L. M. Sergeeva O. P. Grigoryeva O. N. Zimich E. G. Privalko V. I. Shtompel V. P. Privalko P. Pissis A. Kyritsis |
| Affiliation: | a Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraineb National Technical University of Athens, Zografou Campus, Athens, Greece |
| Abstract: | 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. |
| Keywords: | Crystallizable polyurethane random copolymer pseudo-interpenetrating polymer networks phase morphology |
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