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摘要
环氧树脂作为树脂矿物复合材料(RMC)中的粘结剂,其固化特性将直接影响RMC的整体性能。环氧树脂固化物的力学性能主要取决于体系中的交联密度。通过分析不同配比下固化物的固化特性和交联密度,结合力学性能的测试及断口形貌的观察,探究交联密度与力学性能之间的联系,获得环氧树脂与固化剂的最佳配比。研究结果表明,固化剂过量或不足均会引起固化不完全及交联密度下降,从而导致力学性能减弱,固化物拉伸断裂时内部交联点间界面发生断裂形成齐平光滑的断口。环氧树脂与固化剂比例为3.3∶1时,固化特性良好,形成均匀致密的固化物,拉伸断裂时内部交联点发生断裂形成鳞块状断口,固化物拥有极佳的交联密度与力学性能。
Abstract
Epoxy resin(EP) is used as binder in resin mineral composite (RMC),and its curing characteristics will directly affect the overall performance of RMC.The mechanical properties of the cured EP mainly depend on the crosslinking density in the system.By analyzing the curing characteristics and crosslinking density of the over-cured material in different proportions,combining the test of mechanical properties and the observation of the fracture morphology,the relationship between the crosslinking density and the mechanical properties was explored,and obtained the best ratio of EP and curing agent.The research results shown that excessive or insufficient curing agent will cause incomplete curing and decrease of crosslinking density,resulting in weakening of mechanical properties.When the cured product was stretched and fractured,the interface between the internal crosslinking points will break to form a smooth fracture.When the ratio of EP to curing agent was 3.3∶1,the curing characteristics were good to form uniform and dense cured product.During tensile fracture,the internal crosslinking points will break to form a scaly fracture.The cured product had excellent crosslinking density and mechanical properties at this ratio.
关键词
环氧树脂
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固化剂
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交联密度
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力学性能
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断口形貌
Key words
epoxy resin
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curing agent
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crosslink density
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mechanical property
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fracture morphology
环氧树脂复合材料树脂-固化剂力学性能研究[J].
化工新型材料, 2022, 50(5): 180-184 DOI:10.19817/j.cnki.issn1006-3536.2022.05.037
[1] 陈琨,谭清河,杨培林.高速车床花岗岩与铸铁床身动静态性能的对比分析[J].机械设计与制造,2011(12):177-179.
[2] 郭辰光,朱立达,李威力,等.混合纤维增强树脂矿物复合材料研究[J].工程塑料应用,2016,44(7):62-67.
[3] Zhao H L,Ren B W,Huang Y M,et al.Thestatic anddynamic characteristics analysis of a CNC grinding machine bed made from artificial granite[J].Advanced Materials Research,2012,1601(862):1568-1572.
[4] 康瑞兴,王鑫,赵雄燕.高性能环氧树脂粘合剂的改性方法及结构与性能的关系[J].应用化工,2020,49(1):230-233.
[5] 陈平,刘胜平,王德中.环氧树脂及其应用[M].北京:化学工业出版社,2011:10-15.
[6] 白云起,薛丽梅,刘云夫.环氧树脂的改性研究进展[J].化学与黏合,2007,29(4):289-292.
[7] Hassani N,Khoee S.Adhesion strength improvement of epoxy resin reinforced withnanoelastomericcopolymer[J].Materials Science & Engineering A,2010,527(27/28):6562-6567.
[8] 尹纪财.机床用树脂矿物复合材料力学性能及其湿热老化机理研究[D].济南:山东大学,2016.
[9] Laza J M,Julian C A,Larrauri E M,et al.Thermal scanning rheometer analysis of curing kinetic of an epoxy resin:2.an amine as curing agent[J].Polymer,1998,40:34-45.
[10] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.树脂浇铸体性能实验方法:GB/T 2567—2008[S].北京:中国标准出版社,2008:1-4.
[11] American Society for Testing and Materials.Standard test methods for plane-strain fracture toughness and strain energy release rate of plastic materials:ASTM D5045-14[S].Los Angeles:American Society for Testing and Materials,2014:1-4.
[12] 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.
[13] Maurice J,Mark R,Snelgrove V.Effect of conversion on the structure—property relationships of amine—cured epoxy thermosets[J].Applied Materials and Interfaces,2009,1(4):921.926.
[14] 刘伟帅.交联环氧树脂TGDDM结构与性能的分子动力学模拟[D].太原:中北大学,2016.
[15] 白忠勤,刘伟明,邵月华.扫描电镜(SEM)对高分子材料脆性断裂的研究[J].科技信息,2010(13):30,29.
[16] (英)Derek Hull著.断口形貌学观察、测量和分析断口表面形貌的科学[M].北京:科学出版社,2009.
[17] 裴建良,苏立,刘建锋,等.层状大理岩间接拉伸实验及断口形貌和断裂机理分析[J].四川大学学报(工程科学版),2014,46(4):39-45.
基金资助
省级重大专项(201903D121068)
