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Wang YT, Liao SF, Shang K, et al. Efficient approach to improving the flame retardancy of poly(vinyl alcohol)/clay aerogels: incorporating piperazine-modified ammonium polyphosphate. ACS Appl Mater Interfaces. 2015;7(3):1780-6doi: 10.1021/am507409d.
Wang, Y. T., Liao, S. F., Shang, K., Chen, M. J., Huang, J. Q., Wang, Y. Z., & Schiraldi, D. A. (2015). Efficient approach to improving the flame retardancy of poly(vinyl alcohol)/clay aerogels: incorporating piperazine-modified ammonium polyphosphate. ACS applied materials & interfaces, 7(3), 1780-6. https://doi.org/10.1021/am507409d
Wang, Yu-Tao, et al. "Efficient approach to improving the flame retardancy of poly(vinyl alcohol)/clay aerogels: incorporating piperazine-modified ammonium polyphosphate." ACS applied materials & interfaces vol. 7,3 (2015): 1780-6. doi: https://doi.org/10.1021/am507409d
Wang YT, Liao SF, Shang K, Chen MJ, Huang JQ, Wang YZ, Schiraldi DA. Efficient approach to improving the flame retardancy of poly(vinyl alcohol)/clay aerogels: incorporating piperazine-modified ammonium polyphosphate. ACS Appl Mater Interfaces. 2015 Jan 28;7(3):1780-6. doi: 10.1021/am507409d. Epub 2015 Jan 14. PMID: 25588129.
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ACS Appl Mater Interfaces. 2015 Jan 28;7(3):1780-6. doi: 10.1021/am507409d. Epub 2015 Jan 14.

Efficient approach to improving the flame retardancy of poly(vinyl alcohol)/clay aerogels: incorporating piperazine-modified ammonium polyphosphate.

ACS applied materials & interfaces

Yu-Tao Wang, Shi-Fu Liao, Ke Shang, Ming-Jun Chen, Jian-Qian Huang, Yu-Zhong Wang, David A Schiraldi

Affiliations

  1. Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Sichuan University , Chengdu 610064, China.

PMID: 25588129 DOI: 10.1021/am507409d

Abstract

Ammonium polyphosphates (APP) modified with piperazine (PA-APP) was used to improve the flame retardancy of poly(vinyl alcohol) (PVA)/montmorillonite (MMT) aerogels, which were prepared via an environmentally friendly freeze-drying method. The thermal stabilities of the samples were evaluated by thermogravimetric analysis (TG); the flammability behaviors of samples were investigated by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter (CC) tests. TG test results showed that the 5% weight loss temperature (T5%) of PVA/MMT/PA-APP was 10 °C higher than that of PVA/MMT/APP. In combustion testing, all of PVA/MMT/PA-APP aerogels achieved V-0 ratings and have a higher LOI values than the unmodified PVA/MMT aerogel. Moreover, the aerogel with 1% PA-APP5, which means that the content of piperazine is 5% in PA-APP, decreased the cone calorimetry THR value to 5.71 MJ/m(2), and increased the char residue to 52%. The compressive modulus of PVA/MMT/PA-APP was increased by 93.4% compared with PVA/MMT/APP because of the increase in interfacial adhesion between matrix and PA-APP fillers. The densities of the PVA/MMT/PA-APP samples were slightly lower than those of the unmodified aerogels because of reduced shrinkage in the presence of PA-APP. All the tests results indicated that the incorporation of PA-APP not only improved the thermal stability and flame retardancy of aerogels but also maintained their mechanical properties.

Keywords: aerogel; ammonium polyphosphate; flame retardant; mechanical behavior; piperazine; poly(vinyl alcohol)

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