Effect of Irradiation Dose and Post-curing Temperature on Interlaminar Properties of Composite Stepwise Cured by Low Energy E-Beam
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摘要: 采用一定剂量的低能电子束辐照预浸带并分层铺放，在不同温度下对预成型层合板进行热后固化制备复合材料，研究了辐照剂量及后固化温度对复合材料层间性能的影响。结果表明：上表面辐照剂量对复合材料层间剪切强度（ILSS）的影响比后固化温度的影响大，下表面辐照剂量的影响最小；当总辐照剂量（上下表面剂量之和）为100~130 kGy时，复合材料层间剪切强度较高（66.3 MPa）；辐照总剂量大于130 kGy后，因黏接层平均固化度的增大导致复合材料层间黏接效果变差，层间剪切强度明显下降；后固化温度对经过低能电子束辐照后复合材料的固化速率影响较大，在满足预浸带上下表面完全固化的基础上，较低的固化温度能够改善复合材料的层间黏接性能并使其获得较高的层间剪切强度。Abstract: Prepregs were irradiated with different doses by low energy E-beam and placed layer by layer, then the preforming laminate was thermal post-cured with different temperatures to prepare composite. The effects of irradiation dose and the post-curing temperature on the interlaminar properties of composite were studied. The results show that the irradiation dose on the upper surface of the prepregs had the greater influence on interlaminar shear strength (ILSS) than the post-curing temperature, and the irradiation dose on the bottom surface of the prepreg had the smallest influence. The composite obtained the best ILSS of 66.3 MPa when the total irradiation dose(the sum of irradiation dose on the upper surface and bottom surface of the prepregs) ranged from 100-130 kGy. The ILSS decreased as the total irradiation dose with more than 130 kGy because of the poor adhesion between adjacent layers caused by increase of average curing degree. The post-curing temperature had a great influence on the curing rate of irradiated prepregs after irradiated with low energy E-Beam. The low post-curing temperature can improve the adhesive property and the composite could get a high ILSS when upper and bottom surface of prepregs were completely cured.
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