Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst

Sodium hydroxide was used as a base catalyst to reduce the flammability of poly(vinyl alcohol) (PVA) aerogels. The base-modified aerogels exhibited significantly enhanced compressive moduli, likely resulting in decreased gallery spacing and increased numbers of “struts” in their structures. The onse...

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Main Authors:	Zhi-Han Cheng, Mo-Lin Guo, Xiao-Yi Chen, Ting Wang, Yu-Zhong Wang, David A. Schiraldi
Format:	Article
Language:	English
Published:	MDPI AG 2021-05-01
Series:	Gels
Subjects:	aerogel flammability base alkali char
Online Access:	https://www.mdpi.com/2310-2861/7/2/57

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spelling	doaj-2ce69360bfce4b48bf6a34aa9d5d097f2021-05-31T23:29:51ZengMDPI AGGels2310-28612021-05-017575710.3390/gels7020057Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline CatalystZhi-Han Cheng0Mo-Lin Guo1Xiao-Yi Chen2Ting Wang3Yu-Zhong Wang4David A. Schiraldi5Department of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland, OH 44106, USADepartment of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland, OH 44106, USADepartment of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland, OH 44106, USACollege of Chemistry, Sichuan University, Chengdu 610064, ChinaCollege of Chemistry, Sichuan University, Chengdu 610064, ChinaDepartment of Macromolecular Science & Engineering, Case Western Reserve University, Cleveland, OH 44106, USASodium hydroxide was used as a base catalyst to reduce the flammability of poly(vinyl alcohol) (PVA) aerogels. The base-modified aerogels exhibited significantly enhanced compressive moduli, likely resulting in decreased gallery spacing and increased numbers of “struts” in their structures. The onset of decomposition temperature decreased for the PVA aerogels in the presence of the base, which appears to hinder the polymer pyrolysis process, leading instead to the facile formation of dense char. Cone calorimetry testing showed a dramatic decrease in heat release when the base was added. The results indicate that an unexpected base-catalyzed dehydration occurs at fire temperatures, which is the opposite of the chemistry normally observed under typical synthesis conditions.https://www.mdpi.com/2310-2861/7/2/57aerogelflammabilitybasealkalichar
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Zhi-Han Cheng Mo-Lin Guo Xiao-Yi Chen Ting Wang Yu-Zhong Wang David A. Schiraldi
spellingShingle	Zhi-Han Cheng Mo-Lin Guo Xiao-Yi Chen Ting Wang Yu-Zhong Wang David A. Schiraldi Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst Gels aerogel flammability base alkali char
author_facet	Zhi-Han Cheng Mo-Lin Guo Xiao-Yi Chen Ting Wang Yu-Zhong Wang David A. Schiraldi
author_sort	Zhi-Han Cheng
title	Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst
title_short	Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst
title_full	Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst
title_fullStr	Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst
title_full_unstemmed	Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst
title_sort	reduction of pva aerogel flammability by incorporation of an alkaline catalyst
publisher	MDPI AG
series	Gels
issn	2310-2861
publishDate	2021-05-01
description	Sodium hydroxide was used as a base catalyst to reduce the flammability of poly(vinyl alcohol) (PVA) aerogels. The base-modified aerogels exhibited significantly enhanced compressive moduli, likely resulting in decreased gallery spacing and increased numbers of “struts” in their structures. The onset of decomposition temperature decreased for the PVA aerogels in the presence of the base, which appears to hinder the polymer pyrolysis process, leading instead to the facile formation of dense char. Cone calorimetry testing showed a dramatic decrease in heat release when the base was added. The results indicate that an unexpected base-catalyzed dehydration occurs at fire temperatures, which is the opposite of the chemistry normally observed under typical synthesis conditions.
topic	aerogel flammability base alkali char
url	https://www.mdpi.com/2310-2861/7/2/57
work_keys_str_mv	AT zhihancheng reductionofpvaaerogelflammabilitybyincorporationofanalkalinecatalyst AT molinguo reductionofpvaaerogelflammabilitybyincorporationofanalkalinecatalyst AT xiaoyichen reductionofpvaaerogelflammabilitybyincorporationofanalkalinecatalyst AT tingwang reductionofpvaaerogelflammabilitybyincorporationofanalkalinecatalyst AT yuzhongwang reductionofpvaaerogelflammabilitybyincorporationofanalkalinecatalyst AT davidaschiraldi reductionofpvaaerogelflammabilitybyincorporationofanalkalinecatalyst
_version_	1721417371127644160

Reduction of PVA Aerogel Flammability by Incorporation of an Alkaline Catalyst

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