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通过两步法制备聚酰亚胺(PI)纳米纤维,首先采用高压静电纺丝技术制备聚酰胺酸(PAA)纳米纤维,然后在高温下通过不同的亚胺化时间获得PMDA-ODA型PI纳米纤维.利用红外光谱仪、X射线衍射仪、扫描电子显微镜、热重分析仪和力学性能测试仪研究了不同亚胺化时间对PI纳米纤维微观形貌、化学结构、热稳定性以及断裂强度等的影响.结果表明,当亚胺化时间较短时,聚酰胺酸纳米纤维亚胺化并不完全;亚胺化时间达到30 min左右时,聚酰胺酸的亚胺化基本完成;随着亚胺化时间的延长,纳米纤维结晶度逐渐增加,纤维变得更细也更加均匀,热稳定性也随之提高,断裂强度和断裂伸长率也有所提高.通过对聚酰亚胺纳米纤维膜进行透气性测试发现,随亚胺化时间延长纤维膜透气性有所提高.

参考文献

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