目的 拓宽碳化硅增强聚酰亚胺(SiC/PI)复合薄膜在耐磨涂层领域的应用.方法 利用流延成膜法制备SiC/PI复合薄膜,在氮气氛围中对复合薄膜进行600~1000℃的碳化处理,并对碳化后的薄膜进行SEM,XRD及FNR等测试,分析碳化过程中组织结构的变化.结果 由于SiC纳米颗粒起到物理交联点的作用,复合薄膜的热稳定性和残碳率得到提高,同时也具有了断裂塑性特征.随着碳化温度升高,复合薄膜六角碳层结构逐步完善.PI在碳化中,芳核自由基聚合成环数更多的分子,且SiC与PI的界面处产生Si-O键.结论 碳化过程中,SiC纳米粒子与PI作用形成微弱的化学键合,改善了碳膜的界面结合情况,使得其耐热性得到提高.
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