Mechanosensitive polymer-dispersed cholesteric liquid crystal composites based on various polymer matrices

Balenko, N.; Shibaev, V.; Bobrovsky, A.

Авторы: Balenko Nikolai, Shibaev Valery, Bobrovsky Alexey
Журнал: Polymer
Том: 281
Год издания: 2023
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 126119
DOI: 10.1016/j.polymer.2023.126119
Аннотация: Mechanosensitive polymeric materials that change their opticalproperties under mechanical deformation are of considerable interestfor many applications related to obtaining sensors of various kinds ofdeformations. In this work, composite materials based on three flexiblepolymers - polyurethane (PU), polydimethylsiloxane (PDMS) and plasticizedpolyvinyl alcohol (PVA) were designed. They contain an equalamount of dispersed cholesteric liquid crystal mixture in the form ofmicron-sized droplets. Due to the presence of a cholesteric mesophase,composite films are able to change their optical properties under theaction of mechanical stress. This work is focused on a comparison ofthree types of liquid crystalline composites obtained, including discussionof methods for their preparation, morphology, physical-mechanicalproperties and mechano-optical response. PU and PVA-based compositeswith a planar orientation of the liquid crystal molecules at the interfacesof the droplets have selective light reflection (SLR), i.e. they arecolored. Deformation of PU composites results in a shift of the SLR peakto the short-wavelength region of the spectrum followed by its relaxationin the opposite direction. PVA-based composites show a similarmechano-optical response, however, due to the large droplets producedby the emulsion method, the SLR peak broadens during the stretching.PDMS-based composites are highly scattering due to the homeotropicalignment of liquid crystal molecules, but during stretching pronouncedSLR peak appears. Prepared and studied in this work elastic polymerdispersedcholesteric liquid crystals might pave the way for a newgeneration of mechanosensitive materials for practical applications suchas strain sensors.
Добавил в систему: Бобровский Алексей Юрьевич

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Mechanosensitive polymer-dispersed cholesteric liquid crystal composites based on various polymer matricesстатья

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