Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties

Abstract Polysiloxanes are ubiquitous materials in industry and daily life derived from silicates, an abundant resource. They exhibit various properties, which depend on the main-chain network structure. Linear (1D backbone) polysiloxanes provide amorphous materials. They are recognized as fluid mat...

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Autores principales:	Mitsuo Hara, Yuta Iijima, Shusaku Nagano, Takahiro Seki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6184303b593645c4bbbdc1103386c34a
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spelling	oai:doaj.org-article:6184303b593645c4bbbdc1103386c34a2021-12-02T17:51:21ZSimple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties10.1038/s41598-021-97204-82045-2322https://doaj.org/article/6184303b593645c4bbbdc1103386c34a2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97204-8https://doaj.org/toc/2045-2322Abstract Polysiloxanes are ubiquitous materials in industry and daily life derived from silicates, an abundant resource. They exhibit various properties, which depend on the main-chain network structure. Linear (1D backbone) polysiloxanes provide amorphous materials. They are recognized as fluid materials in the form of grease or oil with a low glass transition temperature. Herein we report that a simple linear polysiloxane, poly(3-aminopropylmethylsiloxane) hydrochloride, shows an elastic modulus comparable to that of stiff resins such as poly(tetrafluoroethylene). By introducing an ammonium salt at all the units of this polysiloxane, inter- and intramolecular ionic aggregates form, immensely enhancing the elastic modulus. This polysiloxane is highly hygroscopic, and its modulus can be altered reversibly 100 million times between moist and dry atmospheres. In addition, it works as a good adhesive for glass substrates with a shear strength of more than 1 MPa in the dry state. Despite its simple structure with a flexible backbone, this polymer unexpectedly self-assembles to form an ordered lamellar nanostructure in dry conditions. Consequently, this work reveals new functions and possibilities for polysiloxanes materials by densely introducing ionic groups.Mitsuo HaraYuta IijimaShusaku NaganoTakahiro SekiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mitsuo Hara Yuta Iijima Shusaku Nagano Takahiro Seki Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties
description	Abstract Polysiloxanes are ubiquitous materials in industry and daily life derived from silicates, an abundant resource. They exhibit various properties, which depend on the main-chain network structure. Linear (1D backbone) polysiloxanes provide amorphous materials. They are recognized as fluid materials in the form of grease or oil with a low glass transition temperature. Herein we report that a simple linear polysiloxane, poly(3-aminopropylmethylsiloxane) hydrochloride, shows an elastic modulus comparable to that of stiff resins such as poly(tetrafluoroethylene). By introducing an ammonium salt at all the units of this polysiloxane, inter- and intramolecular ionic aggregates form, immensely enhancing the elastic modulus. This polysiloxane is highly hygroscopic, and its modulus can be altered reversibly 100 million times between moist and dry atmospheres. In addition, it works as a good adhesive for glass substrates with a shear strength of more than 1 MPa in the dry state. Despite its simple structure with a flexible backbone, this polymer unexpectedly self-assembles to form an ordered lamellar nanostructure in dry conditions. Consequently, this work reveals new functions and possibilities for polysiloxanes materials by densely introducing ionic groups.
format	article
author	Mitsuo Hara Yuta Iijima Shusaku Nagano Takahiro Seki
author_facet	Mitsuo Hara Yuta Iijima Shusaku Nagano Takahiro Seki
author_sort	Mitsuo Hara
title	Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties
title_short	Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties
title_full	Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties
title_fullStr	Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties
title_full_unstemmed	Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties
title_sort	simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6184303b593645c4bbbdc1103386c34a
work_keys_str_mv	AT mitsuohara simplelinearionicpolysiloxaneshowingunexpectednanostructureandmechanicalproperties AT yutaiijima simplelinearionicpolysiloxaneshowingunexpectednanostructureandmechanicalproperties AT shusakunagano simplelinearionicpolysiloxaneshowingunexpectednanostructureandmechanicalproperties AT takahiroseki simplelinearionicpolysiloxaneshowingunexpectednanostructureandmechanicalproperties
_version_	1718379288212799488

Simple linear ionic polysiloxane showing unexpected nanostructure and mechanical properties

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