New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications

The operability of liquid crystal displays is strongly impacted by the orientation aspects of nematics, which in turn are affected by the alignment layer surface features. In this work, two polyimide (PI) structures are obtained based on a cycloaliphatic dianhydride and aromatic or aliphatic diamine...

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Autores principales:	Elena-Luiza Epure, Iuliana Stoica, Raluca Marinica Albu, Camelia Hulubei, Andreea Irina Barzic
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	polyimide molecular modeling optical properties rubbing morphology liquid crystals Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/d30be46e7eb04d37ac5d2dcafb9613db
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spelling	oai:doaj.org-article:d30be46e7eb04d37ac5d2dcafb9613db2021-11-25T18:32:31ZNew Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications10.3390/nano111131072079-4991https://doaj.org/article/d30be46e7eb04d37ac5d2dcafb9613db2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3107https://doaj.org/toc/2079-4991The operability of liquid crystal displays is strongly impacted by the orientation aspects of nematics, which in turn are affected by the alignment layer surface features. In this work, two polyimide (PI) structures are obtained based on a cycloaliphatic dianhydride and aromatic or aliphatic diamines with distinct flexibility. The attained PI films have high transmittance (T) for visible radiations, i.e., at 550 nm T > 80%. Here, a novel strategy for creating surface anisotropy in the samples that combines rubbing with a cloth and stretching via pressing is reported. Birefringence and atomic force microscopy (AFM) scans reveal that the generated orientation of the chains is affected by the chemical structure of the polymer and order of the steps involved in the surface treatment. Molecular modeling computations and wettability tests show that the PI structure and produced surface topography are competitive factors, which are impacting the intensity of the interactions with the nematic liquid crystals. The achieved results are of great relevance for designing of reliable display devices with improved uniform orientation of liquid crystals.Elena-Luiza EpureIuliana StoicaRaluca Marinica AlbuCamelia HulubeiAndreea Irina BarzicMDPI AGarticlepolyimidemolecular modelingoptical propertiesrubbingmorphologyliquid crystalsChemistryQD1-999ENNanomaterials, Vol 11, Iss 3107, p 3107 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	polyimide molecular modeling optical properties rubbing morphology liquid crystals Chemistry QD1-999
spellingShingle	polyimide molecular modeling optical properties rubbing morphology liquid crystals Chemistry QD1-999 Elena-Luiza Epure Iuliana Stoica Raluca Marinica Albu Camelia Hulubei Andreea Irina Barzic New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications
description	The operability of liquid crystal displays is strongly impacted by the orientation aspects of nematics, which in turn are affected by the alignment layer surface features. In this work, two polyimide (PI) structures are obtained based on a cycloaliphatic dianhydride and aromatic or aliphatic diamines with distinct flexibility. The attained PI films have high transmittance (T) for visible radiations, i.e., at 550 nm T > 80%. Here, a novel strategy for creating surface anisotropy in the samples that combines rubbing with a cloth and stretching via pressing is reported. Birefringence and atomic force microscopy (AFM) scans reveal that the generated orientation of the chains is affected by the chemical structure of the polymer and order of the steps involved in the surface treatment. Molecular modeling computations and wettability tests show that the PI structure and produced surface topography are competitive factors, which are impacting the intensity of the interactions with the nematic liquid crystals. The achieved results are of great relevance for designing of reliable display devices with improved uniform orientation of liquid crystals.
format	article
author	Elena-Luiza Epure Iuliana Stoica Raluca Marinica Albu Camelia Hulubei Andreea Irina Barzic
author_facet	Elena-Luiza Epure Iuliana Stoica Raluca Marinica Albu Camelia Hulubei Andreea Irina Barzic
author_sort	Elena-Luiza Epure
title	New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications
title_short	New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications
title_full	New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications
title_fullStr	New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications
title_full_unstemmed	New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications
title_sort	new strategy for inducing surface anisotropy in polyimide films for nematics orientation in display applications
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d30be46e7eb04d37ac5d2dcafb9613db
work_keys_str_mv	AT elenaluizaepure newstrategyforinducingsurfaceanisotropyinpolyimidefilmsfornematicsorientationindisplayapplications AT iulianastoica newstrategyforinducingsurfaceanisotropyinpolyimidefilmsfornematicsorientationindisplayapplications AT ralucamarinicaalbu newstrategyforinducingsurfaceanisotropyinpolyimidefilmsfornematicsorientationindisplayapplications AT cameliahulubei newstrategyforinducingsurfaceanisotropyinpolyimidefilmsfornematicsorientationindisplayapplications AT andreeairinabarzic newstrategyforinducingsurfaceanisotropyinpolyimidefilmsfornematicsorientationindisplayapplications
_version_	1718411046836764672

New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications

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