预处理方法对定向有机玻璃表面性能及黏结强度影响

Effects of pre-treatment methods on surface properties and adhesive strength of stretched acrylic sheet

为研究不同表面预处理方法对定向有机玻璃表面性能以及与热塑性聚氨酯(TPU)间黏结强度的影响规律及机理,使用AFM、FTIR和接触角测量仪测定酸处理、等离子处理和过渡层处理后定向有机玻璃的表面化学组成、粗糙度与表面接触角,并使用90°剥离实验测试预处理前后定向有机玻璃与TPU之间的黏结强度。结果表明:酸处理和等离子处理后定向有机玻璃表面粗糙度和表面极性增加,同时表面润湿性能得到改善,使黏结强度分别上升了14%和22%;而过渡层预处理提高了基材与TPU的化学相容性,处理后定向有机玻璃表面极性与TPU相近,降低了界面张力,明显改善界面黏结性能,黏结强度由4.44 kN/m上升至23.61 kN/m。

To investigate the influence and mechanism of different surface pretreatment methods on the surface properties of oriented organic glass and its bonding strength with thermoplastic polyurethane(TPU). AFM, FTIR, and contact angle measuring instruments were used to measure the surface chemical composition, roughness, and surface contact angle of oriented organic glass after acid treatment, plasma treatment, and transition layer treatment. The bonding strengths between oriented organic glass and TPU before and after pretreatment were tested by using a 90 ° peel test. The results show that the surface roughness and polarity of oriented organic glass increase after acid treatment and plasma treatment, and the surface wettability is improved, resulting in 14% and 22% increase in bonding strength, respectively. The pre-treatment of the transition layer improves the chemical compatibility between the substrate and TPU.After treatment, the surface polarity of the oriented organic glass is similar to that of TPU, reducing the interfacial tension, and improving the interfacial bonding performance significantly. The bonding strength increases from 4. 44 kN/m to 23. 61 kN/m.