碳纤维/TiO_(2)改性树脂复合材料的制备及力学性能

Preparation and mechanical properties of carbon fiber/TiO_(2) modified epoxy resin composites

针对环氧树脂脆性大、与碳纤维形成的界面性能较差等问题,本文选用纳米TiO_(2)对5284环氧树脂进行改性,并以角联锁机织物为增强体制备了碳纤维/环氧树脂复合材料。使用FT-IR、旋转流变仪、表面张力仪等设备对TiO_(2)/环氧树脂进行表征,并研究了树脂改性对复合材料压缩与层间剪切性能的影响。研究表明:TiO_(2)的羟基与环氧树脂的环氧基和羟基发生了反应;经1wt.%TiO_(2)改性的树脂复数黏度为0.066 Pa·s,纤维与树脂间接触角为28.85°,浸润效果较好;相较于未改性复合材料,树脂改性的复合材料纵向压缩强度与模量分别提高了7.46%和11.03%,横向压缩强度与模量分别提高了6.99%和4.96%,纵向、横向的剪切强度分别提高了6.88%和4.65%。TiO_(2)改性环氧树脂提高了复合材料的承载能力,改善了界面结合强度。

In order to solve the problems of high brittleness of epoxy resin and poor interfacial properties between resin and carbon fibers,5284 epoxy resin was modified by nano-TiO_(2),and carbon fiber/epoxy resin composites were prepared with angle interlocked fabric as reinforcement.The TiO_(2)/epoxy resin was characterized by FT-IR,rotational rheometer,and surface tensiometer.The effects of resin modification on the compressive and interlaminar shear properties of the composites were studied.Results showed that the hydroxyl of TiO_(2)reacted with the epoxy and hydroxyl of the resin.The complex viscosity of the resin modified by 1 wt.%TiO_(2)was 0.066 Pa·s,and the contact angle between resin and fibers was 28.85°,indicating good wettability.Compared with unmodified composite,the longitudinal compressive strength and modulus of resin-modified composite increased by 7.46%and 11.03%,the transverse compressive strength and modulus increased by 6.99%and 4.96%,and the longitudinal shear strength and transverse shear strength increased by 6.88%and 4.65%.TiO_(2)modification of epoxy resin can not only improve the bearing capacity of the carbon fiber/epoxy resin composites,but also enhance their interfacial bonding strength.