Molecular relaxations in poly(ethylene adipate) and block urethane elastomers as studied by the spin probe method

Molecular relaxations in poly(ethylene adipate) and block urethane elastomers as studied by the spin probe method

The spin‐probe method is used to study the rotational mobility of two different probes in poly(ethylene adipate) and a block urethane elastomer synthetized using poly(ethylene adipate), 4,4′‐methylenebis(phenyl isocyanate) and 1,4‐butanediol. The observed ESR spectra correspond to slow and rapid rot...

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Veröffentlicht in:Die Makromolekulare Chemie 1986-06, Vol.187 (6), p.1551-1555
Hauptverfasser: Lembicz, Franciszek, Kuriata, Jerzy, Słonecki, Jerzy
Format: Artikel
Sprache:eng
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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container_title Die Makromolekulare Chemie
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creator Lembicz, Franciszek
Kuriata, Jerzy
Słonecki, Jerzy
description The spin‐probe method is used to study the rotational mobility of two different probes in poly(ethylene adipate) and a block urethane elastomer synthetized using poly(ethylene adipate), 4,4′‐methylenebis(phenyl isocyanate) and 1,4‐butanediol. The observed ESR spectra correspond to slow and rapid rotations of spin probe molecules. They are interpreted using both the isotropic and anisotropic models for the spin probe motion. It is found that at low temperatures the behaviour of spin probes is related to the β‐relaxation, whereas at higher temperatures to the α + β‐relaxation. Differences in mobilities are probably connected with different sizes of spin probes used.
doi_str_mv 10.1002/macp.1986.021870624
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The observed ESR spectra correspond to slow and rapid rotations of spin probe molecules. They are interpreted using both the isotropic and anisotropic models for the spin probe motion. It is found that at low temperatures the behaviour of spin probes is related to the β‐relaxation, whereas at higher temperatures to the α + β‐relaxation. 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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
title Molecular relaxations in poly(ethylene adipate) and block urethane elastomers as studied by the spin probe method
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