自黏附型酚醛树脂流变特性及其预浸料与Nomex蜂窝芯共固化黏接性能
Rheological properties of self-adhesive phenolic resin and adhesion property of prepreg co-curing with Nomex honeycomb core

采用流变仪研究了固化反应温度、时间以及增韧剂和增稠剂加入量对酚醛树脂流变特性的影响,并测试了玻璃纤维增强酚醛预浸料与Nomex蜂窝芯共固化成型后玻璃纤维/酚醛-Nomex蜂窝夹层结构复合材料的板-芯黏接性能。结果表明:改性后酚醛树脂在高温时的黏度提高较多,流动性得到了有效改善,所得预浸料与Nomex蜂窝芯的界面黏接明显增强,并且当增韧剂和增稠剂的加入量与纯酚醛树脂的质量比分别为5%和3%时,所制备出的夹层板的滚筒剥离强度达到15 N·mm/mm以上,改性后酚醛树脂及其预浸料具有了一定程度的自黏附特性。此外,在共固化工艺中采用合适的升温制度,可以进一步提高玻璃纤维/酚醛-Nomex蜂窝夹层结构复合材料的板-芯黏接强度。 The influences of curing reaction temperature and time, toughening agent and thickening agent addition amounts on rheological properties of phenolic resin were investigated using rheometer. The glass fiber reinforced phenolic prepregs were also prepared to fabricate glass fiber/phenolic-Nomex honeycomb cored sandwich composites by co-curing technology with Nomex honeycomb core, and the adhesion properties of skin-core were measured. The results show that the viscosity of the modified phenolic resin at elevated temperature increases a lot and flow behavior is also well improved, the interfacial adhesion between the as-prepared prepreg and Nomex honeycomb core enhances obviously and the climb drum peel strength of the as-prepared sandwich panel can achieve to above 15 N·mm/mm when the mass ratios of toughening agent and thickening agent addition amounts are 5% and 3% to the pure phenolic resin, indicating the self-adhesive characteristics of the modified phenolic resin and its prepreg. Additionally, it can further increase the adhesion strength of skin-core for glass fiber/phenolic-Nomex honeycomb cored sandwich composite by applying a moderate heating profile in co-curing process.