聚氨酯分散液(PUDs)作为上浆剂中的一种重要助剂,对碳纤维束的工艺性能和复合材料的力学性能有着非常重要的影响。深入比较了自制丙烯酸酯改性PUDs(SA-M1、SA-M2)与进口PUD(SA-C)3种助剂成分对碳纤维束工艺性能和环氧树脂基复合材料力学性能的影响。结果表明:SA-M1和SA-M2的复丝拉伸性能和开纤性优于SA-C,但耐磨性弱于后者。聚酯型分散液SA-M2强化了层间剪切强度(ILSS),而聚醚聚酯型分散液SA-M1提高0°拉伸强度。纤维缠绕单向板的0°拉伸强度与层间剪切强度呈现出负相关性。
As a crucial additive in sizing agents,polyurethane dispersions (PUDs) significantly influence the processing properties of carbon fiber tows and the mechanical performance of composites.This paper presented an in-depth comparative study on the effects of three sizing additives—self-developed acrylate-modified PUDs (SA-M1,SA-M2) and an imported PUD (SA-C)—on the processing characteristics of carbon fiber tows and the mechanical properties of epoxy resin composites.The results indicated that both SA-M1 and SA-M2 exhibited superior multifilament tensile properties and spreading characteristics compared to SA-C,though they demonstrated weaker abrasion resistance.The polyester-type dispersion SA-M2 enhanced the interlaminar shear strength (ILSS),while the polyether-polyester-type SA-M1 improved the 0° tensile strength.Notably,a negative correlation was observed between the 0° tensile strength and interlaminar shear strength in the filament-wound unidirectional laminates studied herein.
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