Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems

Abstract In the development of structural composites based on regenerated cellulose filaments, the physical and chemical interactions at the fibre-matrix interphase need to be fully understood. In the present study, continuous yarns and filaments of viscose (rayon) were treated with either polymeric...

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Autores principales:	Bernhard Ungerer, Ulrich Müller, Antje Potthast, Enrique Herrero Acero, Stefan Veigel
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/698c35d4636441c6a20a399320a654be
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spelling	oai:doaj.org-article:698c35d4636441c6a20a399320a654be2021-12-02T18:24:54ZChemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems10.1038/s41598-021-91115-42045-2322https://doaj.org/article/698c35d4636441c6a20a399320a654be2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91115-4https://doaj.org/toc/2045-2322Abstract In the development of structural composites based on regenerated cellulose filaments, the physical and chemical interactions at the fibre-matrix interphase need to be fully understood. In the present study, continuous yarns and filaments of viscose (rayon) were treated with either polymeric diphenylmethane diisocyanate (pMDI) or a pMDI-based hardener for polyurethane resins. The effect of isocyanate treatment on mechanical yarn properties was evaluated in tensile tests. A significant decrease in tensile modulus, tensile force and elongation at break was found for treated samples. As revealed by size exclusion chromatography, isocyanate treatment resulted in a significantly reduced molecular weight of cellulose, presumably owing to hydrolytic cleavage caused by hydrochloric acid occurring as an impurity in pMDI. Yarn twist, fibre moisture content and, most significantly, the chemical composition of the isocyanate matrix were identified as critical process parameters strongly affecting the extent of reduction in mechanical performance. To cope with the problem of degradative reactions an additional step using calcium carbonate to trap hydrogen ions is proposed.Bernhard UngererUlrich MüllerAntje PotthastEnrique Herrero AceroStefan VeigelNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bernhard Ungerer Ulrich Müller Antje Potthast Enrique Herrero Acero Stefan Veigel Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems
description	Abstract In the development of structural composites based on regenerated cellulose filaments, the physical and chemical interactions at the fibre-matrix interphase need to be fully understood. In the present study, continuous yarns and filaments of viscose (rayon) were treated with either polymeric diphenylmethane diisocyanate (pMDI) or a pMDI-based hardener for polyurethane resins. The effect of isocyanate treatment on mechanical yarn properties was evaluated in tensile tests. A significant decrease in tensile modulus, tensile force and elongation at break was found for treated samples. As revealed by size exclusion chromatography, isocyanate treatment resulted in a significantly reduced molecular weight of cellulose, presumably owing to hydrolytic cleavage caused by hydrochloric acid occurring as an impurity in pMDI. Yarn twist, fibre moisture content and, most significantly, the chemical composition of the isocyanate matrix were identified as critical process parameters strongly affecting the extent of reduction in mechanical performance. To cope with the problem of degradative reactions an additional step using calcium carbonate to trap hydrogen ions is proposed.
format	article
author	Bernhard Ungerer Ulrich Müller Antje Potthast Enrique Herrero Acero Stefan Veigel
author_facet	Bernhard Ungerer Ulrich Müller Antje Potthast Enrique Herrero Acero Stefan Veigel
author_sort	Bernhard Ungerer
title	Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems
title_short	Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems
title_full	Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems
title_fullStr	Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems
title_full_unstemmed	Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems
title_sort	chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/698c35d4636441c6a20a399320a654be
work_keys_str_mv	AT bernhardungerer chemicalandphysicalinteractionsofregeneratedcelluloseyarnsandisocyanatebasedmatrixsystems AT ulrichmuller chemicalandphysicalinteractionsofregeneratedcelluloseyarnsandisocyanatebasedmatrixsystems AT antjepotthast chemicalandphysicalinteractionsofregeneratedcelluloseyarnsandisocyanatebasedmatrixsystems AT enriqueherreroacero chemicalandphysicalinteractionsofregeneratedcelluloseyarnsandisocyanatebasedmatrixsystems AT stefanveigel chemicalandphysicalinteractionsofregeneratedcelluloseyarnsandisocyanatebasedmatrixsystems
_version_	1718378101436579840

Chemical and physical interactions of regenerated cellulose yarns and isocyanate-based matrix systems

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