Interplay of structural factors in molecular dynamics of microphase-separated or microphase- mixed structures of polyurethanes revealed by solid-state NMR and dielectric spectroscopy

A set of aromatic-oxyaliphatic polyurethanes (PUs) with different mass fractions of components also containing fluorinated fragments was synthesized and their molecular dynamics studied using various solid-state NMR techniques and dielectric spectroscopy. In contrast to the common model suggested by...

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Bibliographic Details
Published in:Chemical physics impact 2022-06, Vol.4, p.100066, Article 100066
Main Authors: Ostanin, Stepan A., Mokeev, Maxim V., Pikhurov, Dmitry V., Sakhatskii, Aleksandr S., Zuev, Vjacheslav V.
Format: Article
Language:English
Subjects:
Dielectric spectroscopy: microphase structure
Molecular dynamics
Polyurethane
Solid-state NMR
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Summary:A set of aromatic-oxyaliphatic polyurethanes (PUs) with different mass fractions of components also containing fluorinated fragments was synthesized and their molecular dynamics studied using various solid-state NMR techniques and dielectric spectroscopy. In contrast to the common model suggested by Cooper and Tobolsky in 1966, the rigid domains of microphase separated PUs are formed not only by units containing urethane bonds, but also by oxyethylene fragments which form a common rigid phase. The urethane bonds and oxyethylene fragments are incorporated into both rigid and soft phases. Good agreement with Cooper and Tobolsky model is observed only when solubility parameters are significantly different for the hard and soft segments, such as hydrocarbon aromatics and perfluoroaliphatic blocks. [Display omitted]
ISSN:2667-0224
2667-0224
DOI:10.1016/j.chphi.2022.100066