PPS複合填充材料雙極板成型品導電品質之研究

Study on the Conductivity Qualities of Bipolar Plate Parts Molded with PPS Polymer Filled Composites

李平惠(P. H. Lee) ； 廖威量(W. L. Liaw) ； 林明俊(M. J. Lin)

《桃園創新學報》 32期 (2012/12) Pp. 33-43

https://doi.org/10.6989/JTI.201212.0033

摘要

燃料電池（Fuel Cell）是一種對地球生態污染性較低且發電效率較高的能源，而雙極板（Bipolar Plate）佔據全部電池大半主體，是燃料電池的主要元件。以高分子導電性複合材料成型之雙極板，具有重量輕、抗腐蝕佳、成本低、加工快的優點，若能於導電度上有所突破，就能逐漸取代石墨或金屬雙極板。本研究選取聚酚硫（PPS）+50wt.%碳纖維（CF）高分子導電性複合材料，藉由改變不同比例之石墨（GP）添加量，探討射出與射壓成型製作無流道平板製程中，對碳纖維配向、分佈與導電性之影響。研究結果顯示，利用基材添加20wt.%GP，以模溫210℃、料溫330℃、射速60mm/s、保壓150MPa、開模間距0.8mm之製程參數射出壓縮成型後，平面導電度為156S/cm，已達到國際DOE之標準。

關鍵字

雙極板 ； 碳纖維 ； 配向

並列摘要

Fuel cells constitute one of the most promising sources of clean energy and bipolar plate is an important component of a fuel cell. Electrically conductive polymer composites for molding of bipolar plates, has the advantages of lightweight, low cost, chemical stability, and ease of fabrication. They will can alternative to graphite and metal-based material if one can improve the conductivity of polymer composite. In this study, bipolar plates without channel were convectional injection molding (CIM) and injection compression molding (ICM) using PPS polymer filled with 50 wt% carbon fiber by changing the different content of graphite under molding parameters was addressed. The effect of processing parameters including mold temperature, melt temperature, injection velocity, packing pressure and initial open gap on the electrical conductivity performance were analyzed and correlated. Meanwhile, influence of fiber orientation and distribution from molding conditions was evaluated.The results showed that when the molding condition was chosen (mold temperature 210℃, melt temperature 330℃,injection velocity 60mm/s, packing pressure 150MPa, 0.8 mm initial open gap) for ICM. At a graphite level of 20 wt%, the in-plane conductivity can reached 156S/cm and it has been achieved the DOE target.

並列關鍵字

bipolar plate ； carbon fiber ； orientation