Abstract More and more attention has been paid to the synthesis and characterization of self-emulsifying sizing agents without organic solvent due to the demand of environment-friendless. Herein, self-emulsifying amphiphilic epoxy sizing agents with different hydrophilic-hydrophobic ratios were synthesized and used to enhance interfacial adhesion between carbon fibre (CF) and epoxy resin (EP). The effects of hydrophilic-hydrophobic ratio on the characteristics of sizing agent emulsion, the wettability and morphology of sized CFs, the monofilament CF tensile strength and the interfacial shear strength (IFSS) of CF/EP were investigated. The results showed that the emulsions were mono-dispersed nanospheres and the particle size was increased with the hydrophobic groups increasing. High thermal stability with negligible weight loss unless well above 300℃ was obtained for all the emulsions. The sized CFs by the emulsions of high hydrophobic ratio (9:1 and 19:1) exhibited more favorable wettability. The CF surface defects were healed and the roughness was reduced mildly by sizing treatment. The IFSS showed a growing trend with the hydrophobic groups increasing and was significantly enhanced by 96 % as the hydrophilic-hydrophobic ratio was 19:1. The improvement of IFSS benefited mainly from the strong interphase due to the excellent film-forming property, favorable wettability and mechanical interlocking.

中文翻译：

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自乳化两亲性环氧树脂施胶剂亲水疏水比对碳纤维/环氧树脂复合材料界面性能的影响

摘要 由于环境友好的要求，无有机溶剂自乳化施胶剂的合成和表征越来越受到关注。在此，合成了具有不同亲水-疏水比的自乳化两亲环氧树脂施胶剂，并用于增强碳纤维（CF）和环氧树脂（EP）之间的界面粘合。研究了亲水疏水比对上浆剂乳液特性、上浆后CFs的润湿性和形貌、CF/EP的单丝CF拉伸强度和界面剪切强度（IFSS）的影响。结果表明，乳液为单分散的纳米球，粒径随着疏水基团的增加而增大。除非所有乳液都达到 300℃以上，否则热稳定性高，重量损失可以忽略不计。由高疏水比（9:1 和 19:1）乳液施胶的 CFs 表现出更好的润湿性。通过施胶处理，CF表面缺陷得到修复，粗糙度轻度降低。随着疏水基团的增加，IFSS 呈增长趋势，当亲水-疏水比为 19:1 时，IFSS 显着提高了 96%。IFSS 的改善主要得益于其优异的成膜性、良好的润湿性和机械互锁导致的强界面。通过施胶处理，CF表面缺陷得到修复，粗糙度轻度降低。随着疏水基团的增加，IFSS 呈增长趋势，当亲水-疏水比为 19:1 时，IFSS 显着提高了 96%。IFSS 的改善主要得益于其优异的成膜性、良好的润湿性和机械互锁性而形成的强界面。通过施胶处理，CF表面缺陷得到修复，粗糙度轻度降低。随着疏水基团的增加，IFSS 呈增长趋势，当亲水-疏水比为 19:1 时，IFSS 显着提高了 96%。IFSS 的改善主要得益于其优异的成膜性、良好的润湿性和机械互锁性而形成的强界面。