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Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite
In this paper, rigid polyurethane foams that were filled with expandable graphite (RPUF/EG) composites were prepared by the liquid blending method, and then the structure and flame retardancy performance of materials were investigated through optical microscope, scanning electron microscope, limit o...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6523558/ https://www.ncbi.nlm.nih.gov/pubmed/30988268 http://dx.doi.org/10.3390/polym11040686 |
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author | Chen, Yongjun Luo, Yuanfang Guo, Xiaohui Chen, Lijuan Xu, Tiwen Jia, Demin |
author_facet | Chen, Yongjun Luo, Yuanfang Guo, Xiaohui Chen, Lijuan Xu, Tiwen Jia, Demin |
author_sort | Chen, Yongjun |
collection | PubMed |
description | In this paper, rigid polyurethane foams that were filled with expandable graphite (RPUF/EG) composites were prepared by the liquid blending method, and then the structure and flame retardancy performance of materials were investigated through optical microscope, scanning electron microscope, limit oxygen index, cone calorimeter, thermogravimetric analysis coupled to fourier transform infrared spectrum, and X-ray photoelectron spectroscopy. The results showed that a large number of EG could be good to the exhibition of flame retardancy of RPUF, where the optimal material was found at loading 15 phr EG that showed an increased limit oxygen index value and a decreased calorific or fuming value. TGA coupled FTIR and XPS revealed that EG could disassembled before RPUF under heating treatment, and it could form a pyknotic and enahnced residual carbon layer on RPUF surface after the fire, which restricted the transfer of gas, like oxygen or heat into PU matrix, finally resulting in the promotion of flame retardancy of RPUF. |
format | Online Article Text |
id | pubmed-6523558 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-65235582019-06-03 Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite Chen, Yongjun Luo, Yuanfang Guo, Xiaohui Chen, Lijuan Xu, Tiwen Jia, Demin Polymers (Basel) Article In this paper, rigid polyurethane foams that were filled with expandable graphite (RPUF/EG) composites were prepared by the liquid blending method, and then the structure and flame retardancy performance of materials were investigated through optical microscope, scanning electron microscope, limit oxygen index, cone calorimeter, thermogravimetric analysis coupled to fourier transform infrared spectrum, and X-ray photoelectron spectroscopy. The results showed that a large number of EG could be good to the exhibition of flame retardancy of RPUF, where the optimal material was found at loading 15 phr EG that showed an increased limit oxygen index value and a decreased calorific or fuming value. TGA coupled FTIR and XPS revealed that EG could disassembled before RPUF under heating treatment, and it could form a pyknotic and enahnced residual carbon layer on RPUF surface after the fire, which restricted the transfer of gas, like oxygen or heat into PU matrix, finally resulting in the promotion of flame retardancy of RPUF. MDPI 2019-04-16 /pmc/articles/PMC6523558/ /pubmed/30988268 http://dx.doi.org/10.3390/polym11040686 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Chen, Yongjun Luo, Yuanfang Guo, Xiaohui Chen, Lijuan Xu, Tiwen Jia, Demin Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite |
title | Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite |
title_full | Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite |
title_fullStr | Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite |
title_full_unstemmed | Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite |
title_short | Structure and Flame-Retardant Actions of Rigid Polyurethane Foams with Expandable Graphite |
title_sort | structure and flame-retardant actions of rigid polyurethane foams with expandable graphite |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6523558/ https://www.ncbi.nlm.nih.gov/pubmed/30988268 http://dx.doi.org/10.3390/polym11040686 |
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