一九九一年日本科學家飯島澄男發現奈米碳管後，由於其極佳的機械性質與物理性質，科學家們紛紛以碳管為補強材，補強高分子基材與陶瓷基材，顯示碳管可以提升基材各項機械性質。本文以短碳纖維混碳管補強熱固性高分子材料酚醛樹脂，探究補強材對複合材料機械性質之影響，並將纖維編製成球狀，置於CVD爐管中使其與碳管混合，可有效提昇複合材料之機械性質，碳管之界面剪應力與比表面積明顯優於碳纖維，且由FESEM觀測得知碳管與基材間結合良好，碳管補強效果較碳纖維佳；但當兩者混合時由於碳管聚集過大造成應力集中，導致碳管成為此混材結構中之雜質，降低整體材料之機械性質。文中並以Halpin-Tsai方程式嵌合實驗數據，具有不錯之效果；另外也以示差掃描熱量計（DSC）探討補強物對複合材料熱性質之影響，因碳管軸向熱傳導性佳導致整體複合材料因較易活化使玻璃轉換溫度下降，最後以場發射掃描式電子顯微鏡觀測材料之破壞面，觀察出碳管與基材間結合不錯，並發現多壁碳管獨特之刀銷效應（sword-in-sheath）。

Since the carbon nanotubes (CNTs) were discovered by Iijima, researchers used CNTs as reinforcement to enhance the mechanical properties of plastic or ceramic matrices. In this study, short carbon fibers and CNTs were combined to reinforce the phenolic resin and the mechanical properties of the hybrid composites were investigated experimentally. Besides, the ball-shaped continuous carbon fibers were placed in the middle of furnace and multi-walled carbon nanotubes (MWNTs) were produced by CVD process on the fibers to make the special reinforcement. The tensile test results showed that the hybrid composites had the lowest mechanical properties due to larger aggregate size of MWNTs, when compared with the composites reinforced by MWNTs or short fibers. The Halpin-Tsai equation was effectively used to fit the experimental mechanical properties. The differential scanning calorimetry (DSC) was used to investigate the glass transition temperature of composites. The composites with higher percentage of MWNTs have a lower glass transition temperature due to better longitudinal thermal property of MWNTs. Finally the FESEM was used to observe the fracture surface of composites. The results showed that the surface of MWNTs was covered of phenolic resin which resulted in good interaction between the MWNTs and the phenolic resin.

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