第 42 卷第 6 期 | | Vol. 42 No. 6 | 2012 年 12 月 | Dec 2012 |
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所属栏目:功能材料
一种高韧性耐湿性环氧树脂的合成及其性能研究 |
彭 倩,王 曦,苏胜培*
(湖南师范大学 资源精细化与先进材料湖南省普通高校重点实验室,湖南 长沙 410081) |
摘 要:利用β-甲基环氧氯丙烷与双酚A在氢氧化钠的存在下合成了一种新的甲代双酚A型缩水甘油醚环氧树脂(BPA-MECH EP)预聚物,并通过FT-IR、1H NMR、GPC等手段对产物结构进行了表征。用盐酸-丙酮滴定法测定其环氧值为0.43 mol/100 g。用DDM作固化剂,利用DSC对其添加量为树脂质量的20%时体系的固化反应动力学以及最佳固化工艺条件进行了探讨。实验结果表明:BPA-MECH/DDM固化体系的反应级数n为1.30;表观活化能为15.37 kJ/mol;最佳固化工艺条件为:120℃/1 h→140℃/1 h→175℃/3 h→200℃/1 h逐步阶段升温固化。与E-44的DDM固化物进行了性能比较,结果表明:BPA-MECH与E-44固化产物的热变形温度无显著差别,但吸水率降低了47.6%,弯曲强度和弯曲模量分别提高了10.5%和7.8%,冲击强度上升了129.4%,拉伸强度、弹性模量以及断裂伸长率都有不同程度的提高,最大增幅分别为27.6%、25.9%和12.9%。研究结果表明,甲代双酚A型缩水甘油醚环氧树脂是一种性能优良的环氧树脂预聚物。 |
关键词:β-甲基-2,2-二(4-羟基苯基)丙烷环氧树脂;固化动力学;韧性;耐湿性;力学性能 |
中图分类号:TQ630.4+9 文献标识码:A 文章编号:1009-9212(2012)06-0058-06 |
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Study on Synthesis and Properties of a High Toughness and Water-resistant Epoxy Resin |
PENG Qian,WANG Xi,SU Sheng-pei*
(College of Chemistry and Chemical Engineering,Key Lab of Sustainable Resources Processing and Advanced Materials,Hunan Normal University,Changsha 410081,China) |
Abstract:A novel pre-polymer of bisphenol epoxy resin(BPA-MECH)was synthesized from the reaction of β-methyl-epichlorohydrin(MECH)with bisphenol A(BPA)and its structure was characterized by 1H-NMR,FT-IR and GPC. The result of titration showed that the epoxy value of BPA-MECH EP was 0.43 mol/100 g. The curing behavior of the BPA-MECH/4,4’-diamino- diphenylmethane(DDM)epoxy system was studied by means of differential scanning calorimeter(DSC). The DSC data declared that the value of the activation energy(Ea)and the curing reaction order(n)is 15.37 kJ/mol and 1.3,respectively,and the optimal curing process was as following:120℃/1 h→140℃/1 h→175℃/3 h→200℃/1 h. Compared to the properties of the DDM/E-44 composites,the impact strength,bending strength,bending modulus,tensile strength,flexural modulus and elongation at breaking of DDM/BPA-MECH composites increased by 129.4%,10.5%,7.8%,27.6%,25.9% and 12.9%,respectively,while the ratio of water absorption decreased by 47.6%. However,there is no significant change of heat resistance temperature. All data demonstrated that BPA-MECH was an epoxy pre-polymer with excellent properties. |
Key words:BPA-MECH;curing kinetics;toughness;water resistance;mechanical properties |
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基金项目:湖南师范大学潇湘学者启动资金资助课题(化050613)。
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作者简介:彭 倩(1988-),女,湖南长沙人,硕士研究生,研究方向:高分子复合材料。(E-mail:pengqian-0927@163.com)
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联 系 人:苏胜培,教授,博士生导师。(E-mail:sushengpei@gmail.com)
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收稿日期:2012-12-03
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