Journal
COMPOSITES PART B-ENGINEERING
Volume 164, Issue -, Pages 390-399Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2018.12.036
Keywords
DOPO-COFs nanosheets; Flame retardancy; Mechanical performance; Pyrolysis; Fire hazard
Funding
- National Natural Science Foundation of China [51473154, 51761135113]
- Fundamental Research Funds for the Central Universities [WK2320000035]
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The novel phosphorus and nitrogen containing covalent organic frameworks nanosheets, DOPO-COFs nanosheets have been synthesized through one step and then incorporated into epoxy resin (EP) by in situ polymerization. The successful preparation of DOPO-COFs nanosheets have been proved by vanishment of P-H group in FTIR curve of DOPO-COFs nanosheets, nano-size sheet with a lateral size of several micrometers in TEM image, and present of nitrogen and phosphorus elements in EDS pattern. The DOPO-COFs nanosheets show good dispersibility in EP matrix. The well-dispersed DOPO-COFs nanosheets contribute to thermal, mechanical, and flame retardant performances of EP. The weight loss rate of EP/3.2 wt% DOPO-COFs nanosheets decreases by 29.4%. The storage modulus (30 degrees C) and fracture strength of EP 4 increases by 64.5% and 15.6% compared with that of untreated one, respectively. The PHRR and THR of EP loaded with 3.2 wt% of DOPO-COFs nanosheets decrease by 18.4% and 18.50/0, respectively. The feasible mode of action for inhibiting fire hazard of EP nanocomposites has also been put forward.
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