Synthesis and physical characterization of semi-IPNS of linear polyurethane and heterocyclic polymer network

Semi‐interpenetrating polymer networks (semi‐IPN) of linear polyurethane (LPU) and heterocyclic polymer network (HPN) were characterized by IR spectroscopy, small‐angle X‐ray scattering, differential calorimetry with diathermal shells (temperature interval 130‐500 K), and dynamic mechanical analysis...

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Bibliographic Details
Published in:Polymer engineering and science 1999-03, Vol.39 (3), p.549-558
Main Authors: Bartolotta, Antonino, Marco, Gaetano Di, Carini, Giuseppe, D'Angelo, Giovanna, Tripodo, Gaspare, Fainleib, Alexander M., Slinchenko, Elena A., Shtompel, Vladimir I., Privalko, Valery P.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Heterocyclic compounds
Organic polymers
Physicochemistry of polymers
Polycondensation
Polymer networks
Polyurethanes
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:Semi‐interpenetrating polymer networks (semi‐IPN) of linear polyurethane (LPU) and heterocyclic polymer network (HPN) were characterized by IR spectroscopy, small‐angle X‐ray scattering, differential calorimetry with diathermal shells (temperature interval 130‐500 K), and dynamic mechanical analysis (temperature interval 150‐500 K and frequency range 0.3‐30 Hz). The main results obtained may be summarized as follows: (1) The affinity of HPN towards the soft LPU microphase is responsible for the absence of large‐scale heterogeneity of semi‐IPNs on their base (at least, at low HPN/LPU ratios). (2) Phenomenological analysis of small‐scale, Arrhenius‐like subglass relaxations (γ1 and γ2 in LPU and in HPN, respectively) revealed little interference of HPN with relaxation centers (RCs) of LPU in semi‐IPNs, while the local environment of RCs in HPN, on the contrary, strongly depended on semi‐IPN composition.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.11445