超声波与可调正应力协同混合装置的研制及尼龙6/碳纤维复合材料制备
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华南理工大学聚合物成型加工工程教育部重点实验室,广东省高分子先进制造技术及装备重点实验室

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广东省自然科学基金资助项目(2021A1515010487,2021A1515012609)


Development of a mixer under the synergy of ultrasonic wave and adjustable normal stress and preparation of PA6/CF composites
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The Natural Science Foundation of Guangdong Province, China (Grant No. 2021A1515010487,2021A1515012609)

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    摘要:

    本文提出一种超声波与可调正应力协同作用的新型混合方法及相应装置。通过调节该装置内定子和转子轴之间的偏心距(e2)可以调控物料受到的压缩/拉伸应力大小以适合不同的材料体系,同时改变偏心距(e2)还可调节熔体厚度以匹配超声波的有效作用范围,实现了超声波与正应力协同的熔融混合。利用该装置制备了尼龙6(PA6)/碳纤维(CF)复合材料。SEM和光学显微镜图像表明在超声波和正应力的协同作用下CF(25wt.%)均匀分散在基体中且纤维平均保留长度达到291μm;施加超声波后复合材料拉伸强度和模量分别提高41.4%与30.4%;适当的超声作用使得复合材料电导率提升到8.76×10-3S/m且逾渗阈值下降超过5%。新设备为高性能聚合物基纤维增强复合材料的制备提供了新途径。

    Abstract:

    In this study, a new type of mixing method under synergy of ultrasonic wave and adjustable normal stress and its corresponding mixing device was reported. The ratio of compressive/elongational stress could be adjusted by changing the eccentricity (e2) of the internal stator and rotor axis to match different material system. At the same time, the melt thickness could also be regulated by changing the eccentricity (e2) to match the effective range of ultrasonic wave, which realized the synergistic melt mixing of ultrasonic wave and normal stress. Nylon 6 (PA6)/ carbon fiber (CF) composites were prepared by melt compounding using this device. SEM and optical microscope images show that CF (25 wt.%) is uniformly dispersed in matrix and reach an average retention length of 291 μm under the synergy of ultrasonic wave and normal stress. After superimposing the ultrasonic wave, the tensile strength and modulus of composites increase by 41.4% and 30.4% respectively. And appropriate ultrasonic wave increases the electrical conductivity of composites to 8.76×10-3S/m and the percolation threshold reduces by more than 5%. New equipment provides a new strategy for preparation of polymer-based fiber-reinforced composites with high performance.

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  • 收稿日期:2021-12-31
  • 最后修改日期:2022-03-10
  • 录用日期:2022-03-28
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