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Flame-retardant polyvinyl alcohol/cellulose nanofibers hybrid carbon aerogel by freeze drying with ultra-low phosphorus

Huang, Yajun LU ; Zhou, Ting ; He, Song ; Xiao, Huan ; Dai, Huaming ; Yuan, Bihe ; Chen, Xianfeng and Yang, Xiaobing (2019) In Applied Surface Science 497.
Abstract

Polyvinyl alcohol/cellulose nanofibers hybrid aerogel was prepared under freeze drying method. To improve the aerogels' anti-combustion performance, 0.8 wt% microencapsulated ammonium polyphosphate (MCAPP) was loaded as the flame retardant. Aerogels with extremely low density (~0.06 g/cm3) and excellent mechanical performance (Young's modulus: 1.045 MPa) can be obtained. The resulted aerogel also exhibit considerable thermal insulation ability (thermal conductivity: ~0.04 W/m·K). Experimental results indicate that the value of limiting oxygen index increases from 19.5% to 37.5% when loading 0.8 wt% MCAPP. Accordingly, the aerogels' peak heat release rate decreased significantly from 222.44 to 107.84 kW/m2. The char... (More)

Polyvinyl alcohol/cellulose nanofibers hybrid aerogel was prepared under freeze drying method. To improve the aerogels' anti-combustion performance, 0.8 wt% microencapsulated ammonium polyphosphate (MCAPP) was loaded as the flame retardant. Aerogels with extremely low density (~0.06 g/cm3) and excellent mechanical performance (Young's modulus: 1.045 MPa) can be obtained. The resulted aerogel also exhibit considerable thermal insulation ability (thermal conductivity: ~0.04 W/m·K). Experimental results indicate that the value of limiting oxygen index increases from 19.5% to 37.5% when loading 0.8 wt% MCAPP. Accordingly, the aerogels' peak heat release rate decreased significantly from 222.44 to 107.84 kW/m2. The char residue rises when introducing MCAPP and the char's integrity improves a lot after combustion. The fire performance index and fire growth index increases and falls respectively, indicating improved anti-combustion performance. X-ray photoelectron spectroscopy results show C[dbnd]O bonds would be increased for the esterification of phosphoric acid from MCAPP. In addition, the production of carbonate can be prohibited while combustion when loading MCAPP.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aerogel, Cellulose nanofibers, Flame retardant, Polyvinyl alcohol
in
Applied Surface Science
volume
497
article number
143775
publisher
Elsevier
external identifiers
  • scopus:85071728608
ISSN
0169-4332
DOI
10.1016/j.apsusc.2019.143775
language
English
LU publication?
yes
id
f17ac809-0631-46cf-b4cb-57c9ec2d4821
date added to LUP
2019-09-16 08:49:11
date last changed
2020-06-03 05:09:43
@article{f17ac809-0631-46cf-b4cb-57c9ec2d4821,
  abstract     = {<p>Polyvinyl alcohol/cellulose nanofibers hybrid aerogel was prepared under freeze drying method. To improve the aerogels' anti-combustion performance, 0.8 wt% microencapsulated ammonium polyphosphate (MCAPP) was loaded as the flame retardant. Aerogels with extremely low density (~0.06 g/cm<sup>3</sup>) and excellent mechanical performance (Young's modulus: 1.045 MPa) can be obtained. The resulted aerogel also exhibit considerable thermal insulation ability (thermal conductivity: ~0.04 W/m·K). Experimental results indicate that the value of limiting oxygen index increases from 19.5% to 37.5% when loading 0.8 wt% MCAPP. Accordingly, the aerogels' peak heat release rate decreased significantly from 222.44 to 107.84 kW/m<sup>2</sup>. The char residue rises when introducing MCAPP and the char's integrity improves a lot after combustion. The fire performance index and fire growth index increases and falls respectively, indicating improved anti-combustion performance. X-ray photoelectron spectroscopy results show C[dbnd]O bonds would be increased for the esterification of phosphoric acid from MCAPP. In addition, the production of carbonate can be prohibited while combustion when loading MCAPP.</p>},
  author       = {Huang, Yajun and Zhou, Ting and He, Song and Xiao, Huan and Dai, Huaming and Yuan, Bihe and Chen, Xianfeng and Yang, Xiaobing},
  issn         = {0169-4332},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Applied Surface Science},
  title        = {Flame-retardant polyvinyl alcohol/cellulose nanofibers hybrid carbon aerogel by freeze drying with ultra-low phosphorus},
  url          = {http://dx.doi.org/10.1016/j.apsusc.2019.143775},
  doi          = {10.1016/j.apsusc.2019.143775},
  volume       = {497},
  year         = {2019},
}