丙烯酸在碳纤维表面的电聚合改性

为了提高碳纤维与树脂基体之间的粘结性能,采用循环伏安法,以丙烯酸为聚合单体对碳纤维进行了电聚合改性.利用傅里叶红外光谱仪和扫描电子显微镜研究了改性前后碳纤维表面的结构变化,并利用电脑伺服控制材料试验机对复合材料进行了力学性能测试.结果表明:当丙烯酸浓度为0.3 mol/L、循环次数为10次时,碳纤维的改性效果最佳;改性后的碳纤维在红外光谱的2 680 cm-1附近出现了—OH特征吸收峰;复合材料的层间剪切强度由10.50 MPa增加到了23.44 MPa,提高了123.21%;改性后碳纤维表面出现了圆片状丙烯酸聚合物层,且可与环氧树脂基体紧密结合.

Electropolymerization modification on surface of carbon fiber with acrylic acid

In order to improve the bonding properties between carbon fiber and resin matrix, the electropolymerization modification of carbon fiber was performed through adopting the cyclic voltammetry and taking the acrylic acid as the polymeric monomer. The microstructure change on the surface of carbon fiber before and after the modification was studied with Fourier infrared(FT-IR)spectrometer and scanning electron microscope(SEM), and the mechanical properties of the composite were tested with the computer servo controlled material testing machine. The results indicate that when the concentration of acrylic acid is 0.3 mol/L and the number of cycles is 10 times, the optimum modification effect for the carbon fiber is obtained. The characteristic absorption peak of —OH appears near 2 680 cm^-1 in FT-IR spectra of modified carbon fiber. The interlaminar shear strength(ILSS)of composite increases from 10.50 MPa to 23.44 MPa, and the enhanced amplitude is 123.21%. A disc-like polymer layer of acrylic acid forms on the surface of modified carbon fiber, and closely combines with the epoxy resin matrix.