| Because of its advantages such as good adhesion，excellent mechanical andhigh insulation properties，epoxy resin（EP）is widely applied in various fields. Withthe development of science and technology, the demand for material performancebecomes increasingly strict. Therefore, the weakness of epoxy resin has somewhatlimited its development. In this study, a double function diamine curing agent wassynthetized. It was prepared to be in cross-linking and solidity with epoxy resin. Theperformance of the curing product was investigated. Besides, the performance of thecuring agent was analyzed after a phosphorous epoxy resin was prepared.(1)A novel fluorinated and bromined diamine curing agent2,2-bis[4-(4-amino-2-trifluoromethylphenoxy)-3,5-dibromophenyl] propane (BAFBP) wassynthesized based on tetrabromobisphenol-A and2-chloro-5-nitro-trifluoromethyl-benzene. The structure of BAFBP was characterized by FTIR,1H NMR and19FNMR. The results showed that the molecular structure of the product was consistentwith the desired product design. In addition, the thermal properties of the curingagent were measured by TG and DSC. Its initial decomposition temperature was272℃and the maximum thermal decomposition temperature was379℃. Its charyield at700℃was25.1%(2) Different epoxy curing systems were obtained through curing the E44with4,4’-Methylenedianiline (DDM),4,4’-Methylene bis (2-chloroaniline)(MOCA)and BAFBP. The structures of the epoxy curing systems were analyzed by LOI, TG,MCC, contact angle measurement and water absorption test. The results showed that:as the system of E44/BAFBP had worst thermal stability, its heat release rate (HRR)and total heat release (THR) were lowest. The char yield of E44/BAFBP was muchhigher than that of other systems, and the micrograph result showed that the residualcarbon surface was more compact. Compared to E44/DDM and E44/MOCAsystems,the E44/BAFBP system had the lowest water absorption and surface tension,showing good water repellency and best surface properties.(3) DBQEP was made based on10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-phosphaphenanthrene-10–oxide (DOPO-BQ) and epoxychloropropane (EC), and its curing behavior was investigated using DDM, MOCAand BAFBP as curing agent. The structures of the epoxy curing systems were analyzed by LOI, TG, MCC, contact angle measurement and water absorption test.The results showed that: compared to ordinary epoxy resin systems, the phosphorusepoxy resin had good flame retardancy and thermal stability, and the micrographshowed that the surface of residual carbon was compact and smooth.(4) The curing kinetics of epoxy resin was examined with BAFBP and MOCAas curing agent.The isothemal curing curves of epoxy resin were obtained by the dynamictorsional vibration method. The effects of the curing catalyst on the epoxy resin’scuring rate were studied and apparent activation energy Ea was calculated. Theresults showed that: adding a curing accelerator could effectively improve the curingrate of the epoxy resin, and was improved along with the content of curing catalystincreasing. The Ea of the E44/BAFBP system was lower than that of the E44/MOCAsystem. |
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