木质素及溴化木质素对合成环氧树脂热性能的影响

Effects of lignin and brominated lignin on the thermal properties of epoxy resin

四溴双酚A型环氧树脂(tetrabromobisphenol A type epoxy resin,TBEP)广泛应用于电子、航空航天工业,但因成本高,大规模应用受到一定的限制。以溴化木质素替代四溴双酚A制备阻燃性、耐热性高,成本低、可再生、环境友好的环氧树脂具有重要意义。以木质素和溴化质素为原料,与双酚A混合制备环氧树脂,研究木质素添加量及溴化质素对环氧树脂热性能的影响。结果表明:木质素-双酚A型环氧树脂(lignin base bisphenol A type epoxy resin,LBEP)的热稳定性较TBEP高;当添加摩尔分数10%的木质素时,LBEP失重起始温度和峰值温度分别比TBEP高4.4℃和68.9℃,失重率低3.8%;溴化木质素-双酚A型环氧树脂(bromided lignin bisphenol A type epoxy,Br-LBEP)较LBEP的失重起始温度和峰值温度分别高112.2℃和93.7℃,热失重率低2.1%。表明Br-LBEP热稳定性较LBEP高,以溴化木质素替代四溴双酚A制备耐热性环氧树脂具有可行性。

Tetrabromobisphenol A epoxy resin is widely used in the electronics and aerospace industries, but application is limited due to high costs. The aim of this study was to determine the effects of lignin and brominated lignin on thermal properties of epoxy resin. Lignin and brominated lignin were mixed with bisphenol A and reacted with epiehlorohydrin to produce epoxy resin. Then, thermal properties of the epoxy resin were tested. Results showed that when the lignin content （M：M） was 10%, temperatures for mass loss were higher than that of bisphenol A epoxy resin （the initial temperature was 4.4 ℃ higher and the peak temperature was 68.9 ℃ higher）, and the mass loss was 3.8% lower. Temperatures for mass loss of brominated lignin-bisphenol A epoxy resin （Br-LBEP） were higher than that of LBEP （initial temperature 112.2 ℃ higher and peak temperature 93.7 ℃ higher） with the mass loss being 2.1% lower. Thus, brominated lignin improved thermal properties and could be used instead of tetrabromobisphenol A to produce high thermal property epoxy resin.