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Published in: Cellulose 18/2021

18-10-2021 | Original Research

Effect of a synthesized chitosan flame retardant on the flammability, thermal properties, and mechanical properties of vinyl ester/bamboo nonwoven fiber composites

Authors: M. N. Prabhakar, K. Venakat Chalapathi, Shah Atta Ur Rehman, Jung-il Song

Published in: Cellulose | Issue 18/2021

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Abstract

In this study, a chitosan-based bioflame retardant additive (referred to as NCS) was prepared by chemically altering CS with silicon dioxide (SiO2) via an ion interchange reaction. The effect of NCS on the thermal stability and mechanical properties of vinyl ester/bamboo fiber (VE/BF) composites was studied. The composites were manufactured by a vacuum-assisted resin transfer molding (VARTM) process. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy and X-ray diffraction analysis were used to characterize the NCS. The spectral results revealed a new peak at 1560 cm−1 corresponding to NH3+O Si, indicative of bond between CS and SiO2. The SEM, and XRD results showed a diverse morphology (coarse surfaces) and a significant decrease in the intensity of the diffraction patterns, respectively, which further supported the formation of NCS. The heat release rate (HRR) of NCS was observed to decrease significantly by 76%, and the residual char content increased by 47% compared with CS. The flame retardant and thermal behavior of the NCS-VE/BF composites were examined by UL-94 standards, microcalorimetry, and cone calorimetry and thermogravimetric analysis (TGA). The results showed a 32% delay in burning time, a 14% enhancement in the limiting oxygen index (LOI), and an 18% decrease in the peak heat release rate (pHRR) and total heat release rate (THR) after incorporation of NCS in the VE/BF composites. The addition of NCS into the VE/BF composites also resulted in improved the mechanical properties of the composites, including the tensile, flexural and impact properties. Overall, the synthesized NCS proved to be suitable for the fabrication of sustainable flame-retardant natural fiber (NF) composites suitable for substructural parts in engineering applications without deterioration of mechanical properties.

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Appendix
Available only for authorised users
Literature
go back to reference Liu SJ, Han YM, Zhu RX et al (2012) Effect of flame retardant on combustion and mechanical properties of bamboo-fiber based composites. Adv Mater Res 488–489:597–601CrossRef Liu SJ, Han YM, Zhu RX et al (2012) Effect of flame retardant on combustion and mechanical properties of bamboo-fiber based composites. Adv Mater Res 488–489:597–601CrossRef
go back to reference Shao N, Qu Y, Hu Y, Tian Z, Gao Y, Zhu X (2021) Effect of starch-based flame retardant on the thermal degradation and combustion properties of reconstituted tobacco sheet. Cellulose 28:741–755CrossRef Shao N, Qu Y, Hu Y, Tian Z, Gao Y, Zhu X (2021) Effect of starch-based flame retardant on the thermal degradation and combustion properties of reconstituted tobacco sheet. Cellulose 28:741–755CrossRef
Metadata
Title
Effect of a synthesized chitosan flame retardant on the flammability, thermal properties, and mechanical properties of vinyl ester/bamboo nonwoven fiber composites
Authors
M. N. Prabhakar
K. Venakat Chalapathi
Shah Atta Ur Rehman
Jung-il Song
Publication date
18-10-2021
Publisher
Springer Netherlands
Published in
Cellulose / Issue 18/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-021-04252-4

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