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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...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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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. |
format | Online Article Text |
id | pubmed-9918293 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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