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Synthesis and physical characterization of semi‐IPNS of linear polyurethane and heterocyclic polymer network
Author(s) -
Bartolotta Antonino,
Marco Gaetano Di,
Carini Giuseppe,
D'Angelo Giovanna,
Tripodo Gaspare,
Fainleib Alexander M.,
Slinchenko Elena A.,
Shtompel Vladimir I.,
Privalko Valery P.
Publication year - 1999
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11445
Subject(s) - materials science , polyurethane , polymer , differential scanning calorimetry , polymer chemistry , relaxation (psychology) , arrhenius equation , interpenetrating polymer network , chemical engineering , composite material , chemistry , thermodynamics , activation energy , psychology , social psychology , physics , engineering
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 (γ 1 and γ 2 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.