CTBN结合纳米SiO_2改性环氧树脂及增韧机理  

Performance and toughing mechanism of CTBN and n-SiO_2 modified epoxy resin

作　　者：姚兴芳[1] 高宇[1] 李健[1] 时晨明[1] 卢娇[1] 

机构地区：[1]天津城市建设学院材料科学与工程系,天津300384

出　　处：《热固性树脂》2011年第1期16-20,共5页Thermosetting Resin

基　　金：建设部项目资助(03-02-019)

摘　　要：以端羧基液体丁腈橡胶(CTBN)结合纳米SiO2(n-SiO2)对环氧树脂(ER)增韧,采用正交法制备了室温固化双组分环氧胶粘剂。通过力学性能测试,红外、示差扫描量热及电镜分析对体系的性能进行了研究。结果表明,环氧树脂与双增韧剂质量比为8∶1,CTBN与n-SiO2质量比为2∶1,甲组分在180℃下反应2.5 h条件下制得的胶粘剂剪切强度、剥离强度、冲击强度分别达到33.85 MPa、5.92 kN/m、18.24 kJ/m2。CTBN和n-SiO2都与ER发生了作用,且双增韧剂增韧的固化产物热稳定性较好。CTBN、n-SiO2、双增韧剂增韧ER的机理分别为颗粒铆钉所诱发的剪切变形机理、银纹钝化机理、剪切变形与银纹钝化相结合形成的韧窝机理。The epoxy resins were toughened by carboxyl liquid nitrile rubber（CTBN）and nano-SiO2（n-SiO2）particles and the two-component room temperature curing epoxy adhesives were prepared using orthogonal method.The properties of the modifed systems were investigated by the mechanical property test,DSC and SEM analysis.The results showed that the shear strength,peeling strength and impact strength of the adhesives reached 33.85 MPa,5.92 kN/m and 18.24 kJ/m2 respectively with the conditions as followed： mass ratio of ER to the dual toughening agents 8∶1,mass ratio of CTBN to SiO2 2∶1 and component A was reacted at 180 ℃ for 2.5 h.CTBN and n-SiO2 were all reacted with ER and the thermal stability of the system with dual toughening agents was better.The toughing mechanism of CTBN,n-SiO2 and the dual toughening agents were shear deformation induceded by rubber particles rivets,craze passivation,dimple from shear deformation and craze passivation,respectively.

关 键 词：端羧基液体丁腈橡胶 纳米SIO2 环氧树脂 胶粘剂 增韧机理 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]