Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites

Cellulose nanofibers (CNFs) have excellent properties, such as high strength, high specific surface areas (SSA), and low coefficients of thermal expansion (CTE), making them a promising candidate for bio-based reinforcing fillers of polymers. A challenge in the field of CNF-reinforced composite rese...

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Autores principales:	Wataru Sakuma, Shuji Fujisawa, Lars A. Berglund, Tsuguyuki Saito
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cellulose nanofibers nanocomposite xerogel flame-retardant Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/b5d19c396e7f461fa1a3decc63ac6267
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spelling	oai:doaj.org-article:b5d19c396e7f461fa1a3decc63ac62672021-11-25T18:31:52ZNanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites10.3390/nano111130322079-4991https://doaj.org/article/b5d19c396e7f461fa1a3decc63ac62672021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3032https://doaj.org/toc/2079-4991Cellulose nanofibers (CNFs) have excellent properties, such as high strength, high specific surface areas (SSA), and low coefficients of thermal expansion (CTE), making them a promising candidate for bio-based reinforcing fillers of polymers. A challenge in the field of CNF-reinforced composite research is to produce strong and transparent CNF/polymer composites that are sufficiently thick for use as load-bearing structural materials. In this study, we successfully prepared millimeter-thick, transparent CNF/polymer composites using CNF xerogels, with high porosity (~70%) and high SSA (~350 m<sup>2</sup> g<sup>−1</sup>), as a template for monomer impregnation. A methacrylate was used as the monomer and was cured by UV irradiation after impregnation into the CNF xerogels. The CNF xerogels effectively reinforced the methacrylate polymer matrix, resulting in an improvement in the flexural modulus (up to 546%) and a reduction in the CTE value (up to 78%) while maintaining the optical transparency of the matrix polymer. Interestingly, the composites exhibited flame retardancy at high CNF loading. These unique features highlight the applicability of CNF xerogels as a reinforcing template for producing multifunctional and load-bearing polymer composites.Wataru SakumaShuji FujisawaLars A. BerglundTsuguyuki SaitoMDPI AGarticlecellulose nanofibersnanocompositexerogelflame-retardantChemistryQD1-999ENNanomaterials, Vol 11, Iss 3032, p 3032 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cellulose nanofibers nanocomposite xerogel flame-retardant Chemistry QD1-999
spellingShingle	cellulose nanofibers nanocomposite xerogel flame-retardant Chemistry QD1-999 Wataru Sakuma Shuji Fujisawa Lars A. Berglund Tsuguyuki Saito Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites
description	Cellulose nanofibers (CNFs) have excellent properties, such as high strength, high specific surface areas (SSA), and low coefficients of thermal expansion (CTE), making them a promising candidate for bio-based reinforcing fillers of polymers. A challenge in the field of CNF-reinforced composite research is to produce strong and transparent CNF/polymer composites that are sufficiently thick for use as load-bearing structural materials. In this study, we successfully prepared millimeter-thick, transparent CNF/polymer composites using CNF xerogels, with high porosity (~70%) and high SSA (~350 m<sup>2</sup> g<sup>−1</sup>), as a template for monomer impregnation. A methacrylate was used as the monomer and was cured by UV irradiation after impregnation into the CNF xerogels. The CNF xerogels effectively reinforced the methacrylate polymer matrix, resulting in an improvement in the flexural modulus (up to 546%) and a reduction in the CTE value (up to 78%) while maintaining the optical transparency of the matrix polymer. Interestingly, the composites exhibited flame retardancy at high CNF loading. These unique features highlight the applicability of CNF xerogels as a reinforcing template for producing multifunctional and load-bearing polymer composites.
format	article
author	Wataru Sakuma Shuji Fujisawa Lars A. Berglund Tsuguyuki Saito
author_facet	Wataru Sakuma Shuji Fujisawa Lars A. Berglund Tsuguyuki Saito
author_sort	Wataru Sakuma
title	Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites
title_short	Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites
title_full	Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites
title_fullStr	Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites
title_full_unstemmed	Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites
title_sort	nanocellulose xerogel as template for transparent, thick, flame-retardant polymer nanocomposites
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b5d19c396e7f461fa1a3decc63ac6267
work_keys_str_mv	AT watarusakuma nanocellulosexerogelastemplatefortransparentthickflameretardantpolymernanocomposites AT shujifujisawa nanocellulosexerogelastemplatefortransparentthickflameretardantpolymernanocomposites AT larsaberglund nanocellulosexerogelastemplatefortransparentthickflameretardantpolymernanocomposites AT tsuguyukisaito nanocellulosexerogelastemplatefortransparentthickflameretardantpolymernanocomposites
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Nanocellulose Xerogel as Template for Transparent, Thick, Flame-Retardant Polymer Nanocomposites

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