Do Hwan-Gi, Lee Pyoung-Chan, Cho Beom-Gon
Department of Polymer Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi 39177, Gyeongbuk, Republic of Korea.
Chassis & Materials Research Laboratory, Korea Automotive Technology Institute, 303 Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si 31214, Chungnam, Republic of Korea.
Polymers (Basel). 2025 May 14;17(10):1344. doi: 10.3390/polym17101344.
Polyphenylene sulfide (PPS) is becoming increasingly valuable in the electrical, electronic, and automotive industries. In particular, PPS composites reinforced with glass fiber (GF) have better dimensional stability and mechanical properties than conventional PPS materials and can be used in applications like electric vehicle capacitor housing. In the electric vehicle industry, the epoxy-molding process is essential for manufacturing capacitor housings, where the bonding strength between the PPS/GF composites and epoxy significantly affects the durability of the product. However, the inert surface characteristics of polymers like PPS limit their interaction with epoxy, decreasing the bonding strength. This study was aimed at enhancing the bonding strength between PPS/GF composites and epoxy by modifying the PPS surface using atmospheric-pressure plasma treatment. The surface modification resulted in increased surface roughness and the introduction of polar functional groups, which improved both mechanical interlocking and chemical affinity to the epoxy. Surface changes were analyzed using atomic force microscopy and scanning electron microscopy, and chemical characterization was conducted using X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy. Surface energy was determined via contact angle measurements, and bonding strength was evaluated through single-lap shear tests. The results showed a 55% increase in surface energy and a 24.8% improvement in bonding strength due to the surface modification.
聚苯硫醚（PPS）在电气、电子和汽车行业正变得越来越有价值。特别是，用玻璃纤维（GF）增强的PPS复合材料比传统PPS材料具有更好的尺寸稳定性和机械性能，可用于电动汽车电容器外壳等应用。在电动汽车行业，环氧成型工艺对于制造电容器外壳至关重要，其中PPS/GF复合材料与环氧树脂之间的粘结强度会显著影响产品的耐久性。然而，像PPS这样的聚合物的惰性表面特性限制了它们与环氧树脂的相互作用，降低了粘结强度。本研究旨在通过使用大气压等离子体处理对PPS表面进行改性，来提高PPS/GF复合材料与环氧树脂之间的粘结强度。表面改性导致表面粗糙度增加，并引入了极性官能团，这既改善了机械互锁，又提高了对环氧树脂的化学亲和力。使用原子力显微镜和扫描电子显微镜分析表面变化，并使用X射线光电子能谱和傅里叶变换红外光谱进行化学表征。通过接触角测量确定表面能，并通过单搭接剪切试验评估粘结强度。结果表明，由于表面改性，表面能增加了55%，粘结强度提高了24.8%。
