Highly Uniform Activation of Carbon Fiber Reinforced Thermoplastics by Low-Temperature Plasma
Highly Uniform Activation of Carbon Fiber Reinforced Thermoplastics by Low-Temperature Plasma
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DOI：
10.1021/acsapm.9b00532
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发表时间：
2019-09
影响因子：
5
通讯作者：
Trey Oldham;Kirby Simon;Daniel R. Ferriell;M. Belcher;A. Rubin;E. Thimsen
中科院分区：
文献类型：
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作者：
Trey Oldham;Kirby Simon;Daniel R. Ferriell;M. Belcher;A. Rubin;E. Thimsen
碳纤维增强热塑性塑料 (CFRTP) 复合材料的非平衡等离子体处理可以将坚固的化学惰性材料激活为非平衡状态，可用于制造具有高韧性的粘合结构组件。非平衡表面不稳定；因此，无损表征技术的发展对于在使用前评估材料至关重要。本文报道了一项发现，等离子体激活的 CFRTP 表面具有尖锐、明确的表面电势分布，其宽度与粘合组件的断裂韧性相关。活化表面的最大寿命约为数天至数周，并假设由亚稳态自由基离子复合物组成。该假设与几个独立的证据一致，包括开尔文探针力显微镜、接触角测量、磁力显微镜和自由基探针实验。
Nonequilibrium plasma treatments of carbon fiber reinforced thermoplastic (CFRTP) composites can activate the robust, chemically inert material into a nonequilibrium state that can be used to fabricate bonded structural assemblies with high toughness. The nonequilibrium surface is unstable; thus, the development of nondestructive characterization techniques is of paramount importance to assess the material before use. Herein, a discovery is reported that plasma-activated CFRTP surfaces are characterized by a sharp, well-defined surface potential distribution, the width of which is correlated to the fracture toughness of bonded assemblies. The activated surface has a maximum lifetime on the order of days to weeks and is hypothesized to be composed of metastable radical-ion complexes. The hypothesis is consistent with several independent pieces of evidence, including Kelvin probe force microscopy, contact angle measurements, magnetic force microscopy, and radical probe experiments.