环氧树脂与胺类固化剂当量比对固化物性能的影响

摘要/Abstract

摘要： 环氧固化物在许多工业领域有非常重要的应用价值。使用不同分子结构和不同用量的固化剂能够影响环氧树脂交联网络结构,进而影响环氧固化物的性能。通过对不同TDE-85 环氧树脂固化配方体系进行了反应动力学分析,静态和动态力学性能分析,考查固化剂种类和用量对环氧树脂浇铸体和碳纤维复合材料性能的影响。研究发现,含DDS 和DETDA 体系的固化反应均为接近一级反应,DDS 固化剂的反应活化能较高于DETDA 固化剂。随着固化剂活泼氢当量与环氧当量比值r的增加,树脂的固化度提高,拉伸强度和伸长率也相应增大,但其模量有所降低。同时,树脂体系的玻璃化转变温度随着r 值的增加先升高再降低。实验研究发现,树脂基体模量增加,相应的碳纤维单向复合材料样品的断裂模式从基体破坏为主转变为界面破坏,层间剪切强度也高。随着浇铸体基体模量的提高,复合材料层间剪切破坏模式由基体破坏转为界面破坏。

关键词: 环氧树脂, 固化剂, 当量比, 复合材料, 力学性能

Abstract: Epoxy/curing agents fabrications play an important role in a variety of industria fields. Using curing agents with different molecular structure and different quantity can influence the networks of epoxy resin,and further influence the mechanical properties of epoxy/curing agents fabrications effectively. To investigate how the quantity of different curing agents influence the property of epoxy and carbon fiber composites,we use 2 different kinds of aromatic amine curing agents DETDA、DDS with different quantity of them. The different molecular structure and quantity of the curing agents will result in modulus change of the epoxy resin. Test different epoxy/curing agents fabrications using soxhlet extracts, tensile strength test,DSC and DMA method. The results reveals that the reaction activity of DDS is lower than DETDA,and the tensile property,T_g and ILSS of composites of DDS curing system are generally better than DETDA curing system of the same r. In both of the 2 curing systems,with the increasing of r, which is ranging from 0.5 to 1.25, the tensile modulus of resin decrease while the tensile strength increase. And T_g decrease after an increasing. In both 2 systems, it reaches the highest T_g when r=0.75. At the same time, the ILSS of composites decrease while the modulus of resin matrix decrease in both 2 curing systems. The failure modes of composites translate from matrix failure to interface failure as matrix modulus increase.

Key words: epoxy, curing agents, stoichiometric ratio r, composites,mechanical properties

中图分类号:

TB332

汪澎, 隋刚, 杨小平. 环氧树脂与胺类固化剂当量比对固化物性能的影响[J]. 复合材料科学与工程, 2013, 0(2): 22-27.

WANG Peng, SUI Gang, YANG Xiao-ping. THE EFFECT OF STOICHIOMETRIC RATIO OF EPOXY AND AMINE ON THE MECHANICAL PROPERTY OF EPOXY/CURING AGENTS FABRICATIONS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2013, 0(2): 22-27.

参考文献

[1] 冯消冰,王伟等. 2MW 风机复合材料叶片材料及工艺研究[J]. 玻璃钢/复合材料,2010,(4): 84-88.
[2] 罗涵. 聚氨酯改性环氧树脂的合成及其复合材料性能研究[J]. 玻璃钢/复合材料,2011,(6): 51-53.
[3] 冯新贤,王耀先,程树军. 一种新型芳胺固化剂的性能研究[J]. 玻璃钢/复合材料,2009,(1): 54-57.
[4] G. Wacker,A. K. Bledzki,A. Chateb. Effect of interphase on the transverse Young's modulus of glass/epoxy composites[J]. Composites Part A, 1998,2 9A: 619-626.
[5] M. Lagache,A. Agbossou,J. Pastor. Role of interphase on the elastic behaviour of composite materials: theoretical and experimental analysis[J]. Journal of Composite Materials,1994,28(12): 1140-1157.
[6] H. M. Hsiao,I. M. Daniel. Strain rate behavior of composite materials[J]. Composites Part B,1998,2 9B: 521-533.
[7] 王惠民,周希真,孙受灵. 碳纤维复合材料压缩性能的研究[J]. 宇航材料工艺,1989,3: 31-34.
[8] Yurgartis,Steven W,Sternstein S. Experiments to reveal the role of matrix properties and composite microstructure in longitudinal com-pression strength[J]. ASTM Special Technical Publication,1994, n1185: 193-204.
[9] Murat Kazancia,Peter Schwartzb,S. Leigh Phoenixc. The effect of matrix stiffness on the creep-rupture lifetime of carbon fiber/epoxy composites[J]. Composite Structures,2001, 54(2-3): 221-223.
[10] 郑亚萍,宁荣昌,乔生儒. TDE-85环氧树脂应用性能研究[J]. 宇航材料工艺,2000,(3): 30-33.
[11] O. Sindt,J. Perez,Molecular architecture-mechanical behavior relationships in epoxy networks[J]. Polymer,1996,37(14): 2989-2997.
[12] John M. Barton,lan Hamerton,Brendan J. Howlin,John R. Jones,Shuyuan Liu. Studies of cure schedule and final propertyrelationships of a commercial epoxy resinusing modified imidazole curing agents[J]. Polymer, 1998,39(10): 1929-1937.
[13] 郑亚萍,宁荣昌. 聚合物模量与其自由体积的关系研究[J]. 西北工业大学学报,2002,20(1): 155-157.
[14] V. Bellenger,W. Dhaoui,J. Verdu,J. Boye,C. Lacabanne. Internal antiplasticization in diglycidyl ether of bisphenol A diamino diphenyl methane non-stoichiometric epoxy networks[J]. Polymer Engineering and Science,1990,30(6): 321-325.
[15] R. J. Morgan,F. M. Kong,C. M. Walkup. Structure-property relations of polyethertriamine-cured bisphenol-A-diglycidyl ether epoxies[J]. Polymer, 1984,25(3): 375-386.
[16] G. R. Palmese,R. L. McCullough. Effect of epoxy-amine stoichiometry on cured resin material properties[J]. Journal of Applied Polymer Science,1992,46(10): 1863-1873.