环氧树脂含量对酚醛环氧树脂性能的影响
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摘要
以酚醛树脂(PR)为基体,环氧树脂(EP)为添加剂,采用物理共混法制备了不同比例的酚醛环氧树脂(EP/PR)材料,并通过氧指数、锥形量热、热重分析和力学拉伸等方法研究了EP含量对复合材料阻燃性能和力学性能的影响。结果表明:当EP含量为5%时,氧指数下降了6.2%;点燃时间减少了32 s,热释放速率峰值提高了8.9%;经热重分析,试件质量损失为20%的时间减少了39 s,温度降低了6.1℃;在力学拉伸实验中,试件的拉伸强度提高了46%,拉伸弹性模量提高了26.1%。研究表明,EP含量为5%时,既保留了PR优良的阻燃性能又显著提升了PR的力学性能。
Using phenolic resin(PR) as matrix, epoxy resin(EP) as additive, different proportions of phenolic epoxy resin(EP/PR)materials were prepared by physical blending method and the effects of EP content on the flame retardancy and mechanical properties of composites were investigated by means of oxygen index,cone calorimetry, thermogravimetric analysis and mechanical stretching. The results showed that when the EP content was 5%,the oxygen index decreased by 6.2%, the ignition time decreased by 32 s, and the peak heat release rate increased by 8.9%. After the TGA analysis, the mass loss time of the test piece was reduced by20% and the time was reduced by 39 s. The temperature decreased by 6.1 ℃. In the mechanical tensile test, the tensile strength of the specimen increased by 46%, and the tensile modulus increased by26.1%. Studies showed that when the EP content is 5%, it not only retained the excellent flame retardant properties of PR, but also significantly improved the mechanical properties of PR.
Using phenolic resin(PR) as matrix, epoxy resin(EP) as additive, different proportions of phenolic epoxy resin(EP/PR)materials were prepared by physical blending method and the effects of EP content on the flame retardancy and mechanical properties of composites were investigated by means of oxygen index,cone calorimetry, thermogravimetric analysis and mechanical stretching. The results showed that when the EP content was 5%,the oxygen index decreased by 6.2%, the ignition time decreased by 32 s, and the peak heat release rate increased by 8.9%. After the TGA analysis, the mass loss time of the test piece was reduced by20% and the time was reduced by 39 s. The temperature decreased by 6.1 ℃. In the mechanical tensile test, the tensile strength of the specimen increased by 46%, and the tensile modulus increased by26.1%. Studies showed that when the EP content is 5%, it not only retained the excellent flame retardant properties of PR, but also significantly improved the mechanical properties of PR.
引文
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[9]王醉寒.玻璃纤维布及碳纤维布增强酚醛环氧树脂复合材料性能研究[D].武汉:武汉工程大学,2015.
[2]杜艳芬,韩卿.酚醛树脂的改性及应用[J].黑龙江造纸,2003,(1):33-35.
[3]薛斌,张兴林.酚醛树脂的现代应用及发展趋势[J].热固性树脂,2007,22(4):47-50.
[4]朱永茂,殷荣忠,刘勇,等. 2005-2006年国外酚醛树脂及其塑料工业进展[J].热固性树脂,2007,22(1):36.
[5]曾莉.环氧改性酚醛树脂的研究[D].武汉:武汉工程大学,2015.
[6]杜郢,周太炎,王哲,等.环氧改性酚醛树脂的合成与研究[J].石油化工,2012,41(5):583-587.
[7]荣立平,刘晓辉,王刚,等.环氧改性酚醛树脂乳液胶黏剂制备[J].化学与黏合,2015,37(5):321-324.
[8]赵蕾.高耐热性酚醛环氧树脂的制备及其复合材料的性能研究[D].太原:中北大学,2017.
[9]王醉寒.玻璃纤维布及碳纤维布增强酚醛环氧树脂复合材料性能研究[D].武汉:武汉工程大学,2015.