采用原位聚合聚氨酯增韧改性环氧树脂

来源期刊:中南大学学报(自然科学版)2008年第5期

论文作者:邓晓琴 卢斌

文章页码:993 - 993

关键词:环氧树脂;DHBP;聚氨脂;增韧;原位聚合

Key words:epoxy resin; DHBP; polyurethane; toughening; in-situ polymerization

摘    要:以介晶二醇4, 4′-二(β-羟乙氧基)联苯(简称DHBP)为原料,通过引入介晶二醇(DHBP)改善基体性能,采用原位聚合聚氨酯的方法,得到综合性能良好的聚氨酯增韧改性的环氧树脂均相体系复合材料。实验结果表明:在DHBP含量为环氧树脂E51的6%,与TDI摩尔比为1:2,DDM用量为35%,反应时间为2.5 h的条件下,所制备材料的冲击强度提高了187.9%,弯曲强度提高4.7%,拉伸强度提高19.5%,热分解温度和玻璃化温度均升高约9 ℃。这表明通过原位聚合的方法可以大大提高复合材料的韧性,不同程度地改善复合材料其他综合性能。

Abstract: Polyurethane was made by in-situ polymerization process using mesogenic diol 4, 4′-di(β-hydroxethyl) xenene (DHBP) as raw materials in the matrix of epoxy resin. Due to the introduction of DHBP, the performance of parent metal was improved. Then, the toughening modified epoxy resin composites with excellent properties were prepared. The system could be seen as homogeneous composite material. The results indicate that when the content of DHBP is 6%, n(DHBP)/n(TDI)=1:2, dosage of DDM is 35%, reaction time is 2.5 h, the impact strength, bend strength and tensile strength of the modified epoxy resin composites are increased by 187.9%, 4.7% and 19.5%, respectively. The decomposing temperature and the glass transition temperature of the composites both increase by 9 ℃. Thus through the in-situ polymerization, the overall performance of composite materials is greatly enhanced.

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