The objective of this study is to investigate the use of an air atmospheric plasma jet for the treatment of sized basalt fibers, used in the fabrication of continuous fiber‐reinforced polypropylene filaments. The plasma treatments were carried out both at a laboratory scale, as well as in‐line during the production of fiber‐reinforced filaments. The latter was carried out at a fiber processing speeds of approximately 15 m/s, just immediately before the polymer coating of the fiber by extrusion. After the air plasma treatment, the water contact angle of the sized basalt fiber decreased from 86° to <10°. X‐ray photoelectron spectroscopy analysis demonstrated that the treatment yielded enhanced levels of oxygen functionality on the fiber surface. After coating with polypropylene, it was observed that there was consistently more homogeneous polymer layer deposited onto the plasma‐activated fiber, compared with that on the unactivated control fiber. The resulting polymer filament with embedded basalt fiber was used to fabricate mechanical test specimens by three‐dimensional printing (fused filament fabrication method). Both three‐point bending tests and short beam strength tests were performed. A comparison study was carried out between test specimens fabricated using sized basalt fiber, with and without the plasma pretreatment. The flexural modulus and maximum shear stress were found to increase by 12% and 13%, respectively, for composite's fabricated using the plasma pretreated basalt fibers. This increased mechanical strength is likely to be due to an increase in interfacial bond strength between the polymer and fiber, with an associated reduction in the level of air incorporation around the basalt filaments as demonstrated using computed tomography analysis.

中文翻译：

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使用在线大气等离子体预处理增强3D打印的玄武岩纤维增强复合材料的机械性能

这项研究的目的是研究使用大气等离子射流处理玄武岩纤维的工艺，该玄武岩纤维用于制造连续纤维增强的聚丙烯长丝。等离子处理既可以在实验室规模进行，也可以在纤维增强长丝生产过程中进行在线处理。后者以大约15 m / s的纤维加工速度进行，就在即将通过挤出进行纤维聚合物涂覆之前。在空气等离子体处理之后，上浆玄武岩纤维的水接触角从86°减小到<10°。X射线光电子能谱分析表明，该处理可提高纤维表面的氧官能度。涂上聚丙烯后，可以观察到，与未活化的对照纤维相比，在等离子体活化的纤维上沉积的聚合物层始终更均匀。所得到的带有嵌入玄武岩纤维的聚合物长丝通过三维印刷（熔融长丝制造方法）用于制造机械测试样品。进行了三点弯曲测试和短梁强度测试。在使用中型玄武岩纤维制成的试样之间进行了比较研究，有无等离子体预处理。对于使用等离子体预处理的玄武岩纤维制成的复合材料，发现其弯曲模量和最大剪切应力分别增加了12％和13％。