湿热环境下聚氨酯电子灌封胶的关联老化机理研究

Study on the correlation aging mechanism of polyurethane electronic encapsulation adhesive in hot and humid environment

在80℃、90%RH(相对湿度)的湿热条件下,开展聚氨酯电子灌封胶固化物加速老化试验,定期取样,分别开展拉伸强度和化学基团含量等宏观性能测试与微观结构分析。研究结果表明:随着老化时间延长,聚氨酯电子灌封胶固化物拉伸强度波动和氨基甲酸酯基团含量逐渐下降;且在置信度为95%时,拉伸强度与氨基甲酸酯基团含量的秩相关系数为0.83。

The accelerated aging test of polyurethane electronic encapsulation adhesive was carried out under hot and humid conditions at 80 ℃ and 90% RH. The macroscopic properties such as tensile strength,chemical group content and microstructure analysis were carried out periodically. The results showed that the tensile strength of polyurethane electronic encapsulation adhesive fluctuated,the content of carbamate group was gradually decreased with the aging time increased. And the rank correlation coefficient between the tensile strength and carbamate group content was 0.83 when the confidence level was 95%.