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Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers

Foamed materials based on a biopolymer of crop straws are environmentally friendly, but ignitability limits their application. In this study, two nitrogenous layers were introduced onto corn straw by esterification and grafting for flame-retardant purposes. The inner thin nitrogenous layer consisted...

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Autores principales: Su, Qiong, Wang, Hongling, Wang, Yanbin, Liang, Shuang, Pang, Shaofeng, Zhao, Xiangfei, Sun, Xiyang, Shi, Xiaoqin, Zhao, Jun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9918293/
https://www.ncbi.nlm.nih.gov/pubmed/36769957
http://dx.doi.org/10.3390/ma16030952
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author Su, Qiong
Wang, Hongling
Wang, Yanbin
Liang, Shuang
Pang, Shaofeng
Zhao, Xiangfei
Sun, Xiyang
Shi, Xiaoqin
Zhao, Jun
author_facet Su, Qiong
Wang, Hongling
Wang, Yanbin
Liang, Shuang
Pang, Shaofeng
Zhao, Xiangfei
Sun, Xiyang
Shi, Xiaoqin
Zhao, Jun
author_sort Su, Qiong
collection PubMed
description Foamed materials based on a biopolymer of crop straws are environmentally friendly, but ignitability limits their application. In this study, two nitrogenous layers were introduced onto corn straw by esterification and grafting for flame-retardant purposes. The inner thin nitrogenous layer consisted of imidazole rings, and the outer thick nitrogenous layer consisted of grafted acrylamide by a free-radical polymerization. The outer nitrogenous layer was simultaneously introduced into the system with a foaming process at 150 °C. Azodiisobutyronitrile acted both as initiator of the polymerization and the main foaming agent, and deionized water acted both as a plasticizing agent and an auxiliary foaming agent, which simplified the process and formula. It was found that cavities of two different sizes were formed. The nonuniformity of the foamed material was ascribed to the heterogeneous foaming precursor consisting of a rigid core and a soft shell. Its excellent flame-retard rating of UL-94 V-0 was ascribed to the two nitrogenous layers, which provides a sufficient nitrogen source for non-combustible gases. A relatively high compression strength of 17.7 MPa was partly due to the fiber of corn straw.
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spelling pubmed-99182932023-02-11 Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers Su, Qiong Wang, Hongling Wang, Yanbin Liang, Shuang Pang, Shaofeng Zhao, Xiangfei Sun, Xiyang Shi, Xiaoqin Zhao, Jun Materials (Basel) Article Foamed materials based on a biopolymer of crop straws are environmentally friendly, but ignitability limits their application. In this study, two nitrogenous layers were introduced onto corn straw by esterification and grafting for flame-retardant purposes. The inner thin nitrogenous layer consisted of imidazole rings, and the outer thick nitrogenous layer consisted of grafted acrylamide by a free-radical polymerization. The outer nitrogenous layer was simultaneously introduced into the system with a foaming process at 150 °C. Azodiisobutyronitrile acted both as initiator of the polymerization and the main foaming agent, and deionized water acted both as a plasticizing agent and an auxiliary foaming agent, which simplified the process and formula. It was found that cavities of two different sizes were formed. The nonuniformity of the foamed material was ascribed to the heterogeneous foaming precursor consisting of a rigid core and a soft shell. Its excellent flame-retard rating of UL-94 V-0 was ascribed to the two nitrogenous layers, which provides a sufficient nitrogen source for non-combustible gases. A relatively high compression strength of 17.7 MPa was partly due to the fiber of corn straw. MDPI 2023-01-19 /pmc/articles/PMC9918293/ /pubmed/36769957 http://dx.doi.org/10.3390/ma16030952 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Su, Qiong
Wang, Hongling
Wang, Yanbin
Liang, Shuang
Pang, Shaofeng
Zhao, Xiangfei
Sun, Xiyang
Shi, Xiaoqin
Zhao, Jun
Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers
title Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers
title_full Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers
title_fullStr Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers
title_full_unstemmed Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers
title_short Flame-Retardant Foamed Material Based on Modified Corn Straw Using Two Nitrogenous Layers
title_sort flame-retardant foamed material based on modified corn straw using two nitrogenous layers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9918293/
https://www.ncbi.nlm.nih.gov/pubmed/36769957
http://dx.doi.org/10.3390/ma16030952
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