磺化聚醚砜上浆剂对碳纤维/聚醚砜复合材料界面性能的影响

为了提高碳纤维(CFs)增强热塑性树脂聚醚砜(PES)复合材料的界面结合力,对PES进行磺化改性,得到磺酸基聚醚砜(SPES)制备的CFs上浆剂,研究了SPES上浆剂对CFs/PES复合材料界面性能的影响和上浆剂质量分数对CFs/PES复合材料的作用效果。结果表明:经过SPES上浆的纤维毛丝量降低、耐磨性提高。同时FTIR和XPS分析表明:SPES中的—SO3H基团与CFs表面微量的活性官能团发生了化学反应,提高了增强体CFs与基体树脂PES间的黏连。当上浆剂含量为1wt%时,CFs/PES复合材料的层间剪切强度(ILSS)提高最显著,比未上浆改性的CFs/PES复合材料的提高了24%。SEM照片证实在此浓度下CFs与PES结合更加紧密。动态力学热分析(DMTA)结果亦证明1wt%的SPES上浆剂提高了CFs/PES复合材料的玻璃化转变温度。

Effects of sulfonated poly(ether sulfone) sizing agent on interfacial properties for carbon fibers/poly(ether sulfone) composites

With the purpose to improve the interface bonding force of carbon fibers (CFs) reinforced thermoplastic resin of poly(ether sulfone) (PES), a kind of new CFs type sizing agent called sulfonated poly(ether sulfone) (SPES) was prepared by PES sulfonated modification. The effect of SPES sizing agent and its mass fraction on interfacial properties of CFs/PES composites were studied. The results show that after sizing of SPES, the fiber fuzz amount decreases, the friction resistance is impoved, and it can also infer the chemical reaction between the group of -SO₃H on the SPES sample with trace reactive functional groups on surface of CFs groups from FTIR and XPS. SPES sizing agent plays a bridge role in the interface of CFs/PES composites and creates a better bonding between them. Interlaminar shear strength (ILSS) of CFs/PES composites improves most significantly than unsizing CFs/PES composites, increased by 24% when the concentration of sizing agent is 1wt%. The SEM photographs confirm a more closely combination between CFs and PES at this concentration. Dynamic mechanical thermal analysis (DMTA) also proves that the concentration of 1wt% SPES sizing agent improves the glass transition temperature of CFs/PES composites most significantly.