液晶聚芳酯原位增强生物基半芳香族聚酰胺复合材料的制备及性能

Preparation and properties of in-situ reinforced bio-based semi-aromatic polyamide composites with liquid crystalline polyarylate

摘要

随着可持续材料的快速发展,生物基半芳香族聚酰胺(Bio-PPA)因其环保的原料来源备受关注,然而,较高的介电损耗和吸湿性导致的尺寸不稳定限制了其在高频信号传输及精密电子封装中的应用。液晶聚芳酯(LCP)凭借其刚性分子结构和原位取向成纤特性,可有效改善Bio-PPA的结晶性、力学性能和尺寸稳定性。采用熔融共混法制备了Bio-PPA原位增强复合材料,并对其化学结构及性能进行系统研究。结果表明,LCP的加入使Bio-PPA的玻璃化转变温度提升至93.7℃,介电损耗降至0.006,拉伸强度提高至107 MPa。此外,LCP可显著降低Bio-PPA体系的最低黏度及对应加工温度,拓宽了加工窗口,在工业领域展现出更广阔的应用前景。

Abstract

With the rapid development of sustainable materials, bio-based semi-aromatic polyamide (Bio-PPA) has attracted much attention due to its environmentally friendly raw material sources. However, the high dielectric loss and dimensional instability caused by hygroscopicity limit its application in high-frequency signal transmission and precision electronic packaging. Liquid crystalline polyarylate (LCP) can effectively improve the crystallinity, mechanical properties and dimensional stability of Bio-PPA by means of its rigid molecular structure and in-situ orientation fiber formation characteristics. In this study, Bio-PPA in-situ reinforced composites were prepared by the melt blending method, and their chemical structure and properties were systematically studied. The results show that the addition of LCP increases the glass transition temperature of Bio-PPA to 93.7 ℃, reduces the dielectric loss to 0.006, and increases the tensile strength to 107 MPa. Furthermore, LCP significantly reduces the minimum viscosity and corresponding processing temperature of the Bio-PPA system, broadens the processing window, and shows broader application prospects in the industrial field.

关键词

生物基半芳香族聚酰胺 / 液晶聚芳酯 / 熔融共混 / 流变行为

Key words

bio-based semi-aromatic polyamide / liquid crystalline polyarylate / melt blending / rheological behavior

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基金资助

国家重点研发计划(2021YFC2101800)

国家自然科学基金(52073049)