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摘要
采用双酚A型环氧树脂(EP)和尼龙12微球(Nylon12)制备了EP/Nylon12复合材料。通过动态热机械分析仪(DMA)测试纯EP和EP/Nylon12复合材料储能模量和玻璃化转变温度(Tg)。在万能材料实验机上对试样进行拉伸测试和三点弯曲测试。采用扫描电镜(SEM)观察单缺口三点弯曲(SEN-3PB)测试样条断面微观形貌。结果表明,与纯EP相比,EP/Nylon12复合材料的拉伸强度随Nylon12微球用量增大而逐渐减小,杨氏模量变化不大,但断裂韧性和临界应变释放能均有明显提高,Nylon12微球用量为10%(wt,质量分数)制得的EP/Nylon12复合材料的玻璃化转变温度(Tg)为193.0℃,具有较好的热学性能,且力学性能得到提高,拉伸强度达到57.2MPa,杨氏模量达到2.50GPa,断裂韧性达到1.25MPa/m2,临界应变释放能达到548.4J/m2;Nylon12微球在EP中的增韧机理主要为微球与基体脱粘和裂纹偏转。
Abstract
EP/Nylon12 composites were prepared based on bisphenol-A type epoxy (EP) and Nylon12 microspheres.The storage modulus and glass transition temperature (Tg) of pure EP and EP/Nylon12 were tested by dynamic thermomechanical analyzer (DMA).Tensile and three-point bending test were carried out on a universal material testing machine.The microscopic morphologies of cross section of samples obtained from the single notch three points bending (SEN-3PB) test were observed through scanning electron microscopy (SEM).The results showed that the tensile strength of EP/Nylon12 decreased gradually with the increased loading of Nylon12 microspheres.Nylon12 microspheres had little influence on the storage modulus of EP.However,the fracture toughness (KIC) and the fracture energy (GIC) of EP/Nylon12 were improved significantly compared with pure EP.The glass transition temperature (Tg) of EP/Nylon12-10% was 193.0℃,it was with good thermal properties.Meanwhile,the mechanical properties were improved.Tensile strength,Young's modulus,KIC and GIC were increased to 57.2MPa,2.50GPa,1.25MPa/m2 and 548.4J/m2,respectively.The toughening mechanism of Nylon12 microspheres in EP were mainly de-bonding and crack deflection induced by microspheres.
关键词
尼龙12微球
/
环氧树脂
/
增韧
/
力学性能
/
三点弯曲
Key words
Nylon12 microsphere
/
epoxy resin
/
toughening
/
mechanical property
/
three-point bending
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化工新型材料, 2018, 46(11): 100-103 DOI:
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基金资助
西南石油大学培育项目(2014PYZ013);西南石油大学大学生开放实验重点项目(KSZ16114)
