Title

Fire Retardant Evaluation Of Carbon Nanofiber/Graphite Nanoplatelets Nanopaper-Based Coating Under Different Heat Fluxes

Keywords

A. Nano-structures; A. Polymer-matrix composites (PMCs); B. Residual/internal stress; B. Thermal properties

Abstract

Three types of carbon nanofiber based nanopapers, namely, 1Clay/5CNF/9APP, 1xGnP/5CNF/9APP, and 3xGnP/1CNF/9APP were made and their flame retardant efficiency was compared with thermogravimetric analysis and cone calorimeter test with 50 kW/m 2 of heat flux. The nanopaper of 3xGnP/1CNF/9APP was selected for experimental study because of its relatively good bonding with underlying structure and flame resistance performance. The fire response of glass fiber reinforced polyester composites with and without the selected nanopaper coating was thoroughly examined with cone calorimeter test using varied heat fluxes. It was found that at higher heat flux, the nanopaper demonstrated better flame retardant efficiency. Specifically, at 100 kW/m 2 of heat flux, the 1st and 2nd PHRR of the nanopaper-coated sample were more than 32% and 47% lower than the PHRR of control sample, respectively. In order to gain an insight into the pyrolysis process and flame retardation mechanism, the temperature profiles at the middle and back of the samples subjected to different heat fluxes were recorded. At 100 kW/m 2 of heat flux, the final temperature within the nanopaper-coated sample was roughly 280 oC, which is lower than control sample. The degradation rates in flexural moduli of the samples with coupon shape were determined using three-point bending. The three-point bending test results showed when the sample was exposed to 25 kW/m 2 heat flux for 240 seconds, the flexural modulus of control sample almost reduced to zero, whereas the nanopaper-coated sample still retained a half of its original flexural modulus. Finally, flame retardation mechanism was proposed for the nanopaper-coated composites. © 2011 Elsevier Ltd. All rights reserved.

Publication Date

12-1-2012

Publication Title

Composites Part B: Engineering

Volume

43

Issue

8

Number of Pages

3293-3305

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.compositesb.2012.02.013

Socpus ID

84866731645 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84866731645

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