PMI泡沫收缩率及胶接性能试验研究

Study on Shrinkage Ratio and Bonding Property of PMI Foam

通过对PMI泡沫芯密度、厚度及外置时间、干燥处理、固化压力等5个参数系统研究,摸索了其与泡沫芯收缩率之间的关系,给出了降低泡沫芯收缩率、提高其尺寸稳定性的方法。同时,通过强度性能试验,研究了不同固化压力(0.2MPa和0.3MPa)对PMI泡沫夹层试验件胶接性能的影响。试验结果表明,泡沫芯厚度越小,密度越低,吸湿量越大,固化压力越大,则泡沫芯收缩率越高。利用烘箱在130℃下干燥处理2h,可降低泡沫芯的收缩率;0.3MPa胶接的PMI泡沫夹层结构试验件的滚筒剥离强度略优于0.2MPa固化压力。剪切强度、平面拉伸强度及弯曲强度无明显差别。

With the propose of further understanding the shrinkage properties of PMI foam, the relationship between shrinkage properties and parameters of PMI foam density, thickness, humidity, dry treatment, cured pressure were studied. The effects of manufacturing pressure on bonding property of PMI foam also were investigated via testing the bonding quality of PMI foams/carbon fiber sandwich standard samples which were manufactured under the pressure of 0.2MPa and 0.3MPa respectively. The research results indicates that the shrinkage ration is higher when the density, thickness and pressure of manufacturing of the PMI foam are higher. The shrinkage ration can decrease by treatment in 130℃ for 2h. Climbing drum peel strength of sandwich sample manufactured under 0.3MPa is higher than under 0.2MPa. There is no significant difference in shear strength, plane tensile strength and flexural strength testing.