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Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion

[Image: see text] The current domestic and foreign research on azide polymers such as glycidyl azide polymers (GAP) mainly focuses on the design, synthesis, modification, and performance of elastomers; it is difficult to prepare the GAP/NC (nitrocellulose) blends, and they have poor mechanical prope...

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Autores principales: Song, Yufang, Xiao, Leqin, Jian, Xiaoxia, Zhou, Weiliang, He, Xu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8638024/
https://www.ncbi.nlm.nih.gov/pubmed/34870029
http://dx.doi.org/10.1021/acsomega.1c04865
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author Song, Yufang
Xiao, Leqin
Jian, Xiaoxia
Zhou, Weiliang
He, Xu
author_facet Song, Yufang
Xiao, Leqin
Jian, Xiaoxia
Zhou, Weiliang
He, Xu
author_sort Song, Yufang
collection PubMed
description [Image: see text] The current domestic and foreign research on azide polymers such as glycidyl azide polymers (GAP) mainly focuses on the design, synthesis, modification, and performance of elastomers; it is difficult to prepare the GAP/NC (nitrocellulose) blends, and they have poor mechanical properties. Here, we developed a green and safe strategy for the blending and compounding of azide binder and NC by blending the emulsion with NC in water and demulsifying. Considering the structural characteristics of GAP, a novel energetic aqueous GAP-E (energetic elastomer) emulsion was prepared by anionic self-emulsion polymerization using 2,2-dimethylol propionic acid as the hydrophilic chain extender, 1,4-butanediol as the chain extender, and triethylamine as a neutralizer. Furthermore, the GAP-E emulsion/triethylene glycol dinitrate/nitrocellulose blends (GAP-E/TEGN/NC) with different proportions were prepared in aqueous phase by the precipitation method. The related properties of the emulsion were studied by gel permeation chromatography, Fourier transform infrared, universal material testing machine, dynamic mechanical analyzer, thermogravimetric analysis, and scanning electron microscopy (SEM). Our results indicated the emulsion exhibited good stability with the number average molecular weight of 76,600. The GAP-E film showed a tensile strength of 17.8 MPa, elongation at break of 415%, glass transition temperature of −28.5 °C, and initial degradation temperature of 242 °C. The GAP-E emulsion and TEGN/NC can be blended in the aqueous phase by the demulsification method to prepare a homogeneous GAP-E/TEGN/NC blend. Fourier transform infrared spectroscopy (FTIR) showed that there was a certain hydrogen bond interaction between GAP-E and TEGN/NC molecules, which was conducive to the improvement of the mechanical properties. The results of SEM indicated that GAP-E could obviously soften the rigid fiber structure of TEGN/GN, and the blends were well mixed with good interfacial compatibility between the GAP-E (5%) and TEGN/NC. When the mass fraction of GAP-E was 5%, the tensile strength and the elongation at break of the blend reached up to 32.1 MPa and 54.4%, which were improved by 33 and 46% compared to those of the TEGN/NC blend system, respectively. The transition temperature remained at −21.6 °C with obvious enhancement on the mechanical properties.
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spelling pubmed-86380242021-12-03 Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion Song, Yufang Xiao, Leqin Jian, Xiaoxia Zhou, Weiliang He, Xu ACS Omega [Image: see text] The current domestic and foreign research on azide polymers such as glycidyl azide polymers (GAP) mainly focuses on the design, synthesis, modification, and performance of elastomers; it is difficult to prepare the GAP/NC (nitrocellulose) blends, and they have poor mechanical properties. Here, we developed a green and safe strategy for the blending and compounding of azide binder and NC by blending the emulsion with NC in water and demulsifying. Considering the structural characteristics of GAP, a novel energetic aqueous GAP-E (energetic elastomer) emulsion was prepared by anionic self-emulsion polymerization using 2,2-dimethylol propionic acid as the hydrophilic chain extender, 1,4-butanediol as the chain extender, and triethylamine as a neutralizer. Furthermore, the GAP-E emulsion/triethylene glycol dinitrate/nitrocellulose blends (GAP-E/TEGN/NC) with different proportions were prepared in aqueous phase by the precipitation method. The related properties of the emulsion were studied by gel permeation chromatography, Fourier transform infrared, universal material testing machine, dynamic mechanical analyzer, thermogravimetric analysis, and scanning electron microscopy (SEM). Our results indicated the emulsion exhibited good stability with the number average molecular weight of 76,600. The GAP-E film showed a tensile strength of 17.8 MPa, elongation at break of 415%, glass transition temperature of −28.5 °C, and initial degradation temperature of 242 °C. The GAP-E emulsion and TEGN/NC can be blended in the aqueous phase by the demulsification method to prepare a homogeneous GAP-E/TEGN/NC blend. Fourier transform infrared spectroscopy (FTIR) showed that there was a certain hydrogen bond interaction between GAP-E and TEGN/NC molecules, which was conducive to the improvement of the mechanical properties. The results of SEM indicated that GAP-E could obviously soften the rigid fiber structure of TEGN/GN, and the blends were well mixed with good interfacial compatibility between the GAP-E (5%) and TEGN/NC. When the mass fraction of GAP-E was 5%, the tensile strength and the elongation at break of the blend reached up to 32.1 MPa and 54.4%, which were improved by 33 and 46% compared to those of the TEGN/NC blend system, respectively. The transition temperature remained at −21.6 °C with obvious enhancement on the mechanical properties. American Chemical Society 2021-11-17 /pmc/articles/PMC8638024/ /pubmed/34870029 http://dx.doi.org/10.1021/acsomega.1c04865 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Song, Yufang
Xiao, Leqin
Jian, Xiaoxia
Zhou, Weiliang
He, Xu
Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion
title Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion
title_full Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion
title_fullStr Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion
title_full_unstemmed Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion
title_short Synthesis and Characterization of a Novel Aqueous Glycidyl Azide Polymer Emulsion
title_sort synthesis and characterization of a novel aqueous glycidyl azide polymer emulsion
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8638024/
https://www.ncbi.nlm.nih.gov/pubmed/34870029
http://dx.doi.org/10.1021/acsomega.1c04865
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