Latent curing epoxy system with excellent thermal stability, flame retardance and dielectric property
| Autor: | Yu-Zhong Wang, Ying-Jun Xu, Wang Liao, Wen-Hui Rao, Min Qi, Li Chen, De-Ming Guo |
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| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Materials science General Chemical Engineering 02 engineering and technology General Chemistry Calorimetry Dielectric Epoxy Dynamic mechanical analysis 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Limiting oxygen index visual_art visual_art.visual_art_medium Environmental Chemistry Thermal stability Composite material 0210 nano-technology Curing (chemistry) |
| Zdroj: | Chemical Engineering Journal. 347:223-232 |
| ISSN: | 1385-8947 |
| Popis: | To obtain a latent curing epoxy system with satisfactory thermal stability, flame retardance and dielectric properties, imidazolium dibenzo[c,e][1,2]oxaphosphate (IDOP) was synthesized by a facile way and utilized as a latent flame-retardant curing agent for epoxy resins (EP). It was confirmed that IDOP/EP one-pack system kept reactive inert near room temperature and cured efficiently under heating with a moderate heat release. The curing procedure was explored by X-ray photoelectron spectroscopy (XPS), confirming that the flame-retardant group was incorporated into epoxy chains by covalent and/or ionic bonds, hence the intrinsic flame retardance and excellent thermal stability were given to the cured resins finally. With only 15 wt% IDOP additions, the limiting oxygen index (LOI) increased to 37.0% from 20.5% of the reference sample, and UL-94 V-0 rating was achieved. The results of cone calorimetry test further certified that IDOP/EP showed satisfactory flame retardance dominating in gaseous phase, which was confirmed by the results of thermogravimetric analysis/infrared spectrometry (TG-IR). The thermal mechanical behavior of IDOP/EP was also evaluated by dynamic mechanical analysis (DMA). Especially, the incorporation of the flame-retardant group didn’t deteriorate the dielectric properties of the cured resin. Benefiting from the advances, the latent curing epoxy system with excellent comprehensive performance exhibited potential for versatile applications. |
| Databáze: | OpenAIRE |
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