Affiliation:
1. College of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 P. R. China
2. Nuclear and Radiation Safety Center Ministry of Ecology and Environment No. 9 Zhixing East Road, Fangshan Beijing 102400 P. R. China
3. College of Chemistry Jilin University 2699 Qianjin Street Changchun 130012 P. R. China
4. Changyuan Electronics (Dongguan) Co., Ltd. Baopi Industrial District Fumin Industrial Park 2# Dalang Dongguan 523770 P. R. China
Abstract
AbstractCarbon fiber (CF)‐reinforced epoxy resin (EP) composites are lightweight materials with excellent comprehensive performance. However, the flammability of EP and the poor interfacial bonding between CF and EP are two key disadvantages that limit their further applications. Here, a kind of water‐soluble lignin‐based CF sizing agent (ELBEDK) is prepared through hydrophilic modification of enzymatic lignin, which can significantly enhance the interfacial interaction between CF and EP. Additionally, a highly efficient intumescent flame retardant (LMA) is prepared. The EP, enzymatic lignin, LMA and CF sized ELBEDK are compounded to obtain the fire‐safety CF reinforced composites (SCF/FEP/L). The flame retardancy of SCF/FEP/L with 7% LMA (SCF/FEP7) reached V‐0 rating. Moreover, SCF/FEP/L with 7% LMA and 15% lignin (SCF/FEP7/L15) present an limiting oxygen index (LOI)of 30.2% and V‐0 of UL‐94. Specifically, the total smoke production and the heat release rate are 47.8% and 46.81% lower than that of SCF/EP, respectively, indicating the improved smoke suppression and flame retardancy. The IFSS and flexural strength of SCF/FEP7/L15 are improved to be 59.4 MPa and 511.1 MPa, respectively. This study presents a simple approach to fabricate low‐cost high performance lignin‐based flame retardant CF/EP biocomposites with wide application potential.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Chinese Academy of Sciences