Synthesis of chitosan-based flame retardant and its fire resistance in epoxy resin

Rui Chen; Zijin Luo; XueJun Yu; Hao Tang; Yuan Zhou; Hong Zhou

doi:10.1016/j.carbpol.2020.116530

Synthesis of chitosan-based flame retardant and its fire resistance in epoxy resin

Carbohydr Polym. 2020 Oct 1:245:116530. doi: 10.1016/j.carbpol.2020.116530. Epub 2020 Jun 3.

Authors

Rui Chen¹, Zijin Luo², XueJun Yu³, Hao Tang², Yuan Zhou², Hong Zhou⁴

Affiliations

¹ Wuhan Institute of Technology, Wuhan, 430073, China; West Anhui University, Lu'an, 237012, China.
² Wuhan Institute of Technology, Wuhan, 430073, China.
³ Three Gorges Public Inspection and Testing Center, Yichang, 443000, China.
⁴ Wuhan Institute of Technology, Wuhan, 430073, China. Electronic address: hzhouh@126.com.

PMID: 32718634
DOI: 10.1016/j.carbpol.2020.116530

Abstract

A novel flame retardant CCD was synthesized by the condensation between cinnamalde and chitosan, followed by the addition reaction with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO), and CCD was named from the initials of the three raw materials. The intermediate product CC and the target product CCD was then characterized by infrared spectrometry and elemental analysis. The flame retardancy of EP thermosets modified by CCD was dramatically improved. Epoxy resin (EP) with 10wt% CCD passed vertical burning (UL-94) V-0 rating and possessed limited oxygen index (LOI) value of 31.6 %. Cone calorimeter test exhibited the introduction of 3.5g CCD into 35g EP decreased the total heat release by 38.8 % and decreased the total smoke product by 72.0 %. XPS, FTIR, SEM and Raman tests were proceeded to determine the char residue for EP/10 % CCD thermoset, and the results showed that char residue for EP/10 % CCD thermoset possessed dense and compact structure which played a positive effect in blocking the exchange of heat and gas.

Keywords: Chitosan; DOPO; Epoxy resin; Flame-retardant.