氣體反壓對ABS高分子複合材料碳纖維配向之研究

STUDY ON THE CARBON FIBER ORIENTATION OF ABS POLYMER COMPOSITES FOR GAS COUNTER PRESSURE

李平惠(Ping-Hui Lee) ； 廖威量(Wei-Liang Liaw) ； 林明俊(Ming-Chung Lin)

《桃園創新學報》 35期 (2015/12) Pp. 67-89

摘要

熱塑性複合材料大量應用於綠色能源、汽車輕量化與3C 等產業，複合材料之導電性要求較過去更高，提升導電性需將碳纖維含量增加，但易造成熔膠黏度變高和成本增加，因此碳纖維含量多寡與碳纖維配向分佈息息相關。本研究使用氣體反壓法(Gas Counter Pressure, GCP)應用於射出成型製程，進行不同反壓壓力對纖維配向分佈之基礎實驗，探討對各層間和各個位置之纖維配向角度分佈、配向層度之影響。研究結果顯示，反壓壓力增加，纖維配向角度於31°-150° 區間纖維數量比增加，且於中間位置影響最大，其纖維配向角度61°-120° 區間纖維數量高於其他位置。反壓壓力增加，各個位置與表皮層、剪切層、核心層三層間之纖維配向層度值皆有下降趨勢，層間層度值大小順序為核心層小於剪切層小於表皮層，而各個位置層度值大小順序為遠澆小於中間小於近澆。

關鍵字

氣體反壓 ； 碳纖維 ； 纖維配向

並列摘要

Polymers filled with conducting fibers to provide electrical conductivity performance have received great attention due to the requirements of many engineering applications. In the present article, injection molding of ABS/carbon-fiber composites using applied Gas Counter Pressure (GCP) was conducted and the overall fiber orientation and associated through-plane electrical conductivity (TPEC) and of each layer (core, shear, and skin layers) and various locations (far gate, center, and near gate) were characterized. Results show that GCP had significant effects on the fiber orientation and skin layer thickness, resulting in decreases in the fiber orientation level (FOL) value in all locations and TPEC increases with increasing GCP in the core region of the molded composites (improvement of 62 % when 100 bar GCP was applied). However, the effect of increased skin layer thickness in reducing TPEC was stronger than the effect of decreased FOL in raising TPEC when GCP was applied. This resulted in the overall TPEC falling slightly with increasing GCP. The results also show that the electrical conductivity followed the sequence of far gate ＞ center ＞ near gate and the fiber orientation level followed the order of core layer ＜ shear layer ＜ skin layer. The results obtained in this investigation reveal the potential application of GCP technology associated with mold temperature control in injection molding to manufacture products with enhanced electrical conductivity in the future.

並列關鍵字

Gas Counter Pressure ； Carbon Fiber ； Fiber Orientation