竹纖維在彎曲預型後，其折角處的拉伸強度會因內部纖維素受到破壞而降低。因此，本研究通過表面處理對竹纖維進行改性，以增加其彎曲強度，從而提升竹纖維在預型後，其折角的拉伸強度。研究內容將分為四個階段進行。第一階段探討不同油處理以及油溫對竹纖維機械性質、吸水性的影響。根據研究結果，棕櫚油處理具有最佳的疏水性和次佳的機械性質。隨著油處理溫度的提高，竹纖維有著更好的疏水性，但其機械性質會降低。第二階段探討不同油處理對竹纖維與樹脂結合度的影響，並研究了竹纖維埋入樹脂的深度對其界面剪切力的影響。結果顯示，經過棕櫚油處理的竹纖維與樹脂的結合度最佳。此外，竹纖維與樹脂的界面剪切力隨著竹纖維埋入樹脂的深度增加而減少。第三階段由前兩階段所得出的最佳油處理製程，將以150 °C的棕櫚油作為油處理製程。本階段研究了表面處理對竹纖維折角處拉伸強度的影響。研究結果顯示，經過棕櫚油處理的竹纖維能夠提高預型後折角處的拉伸強度。第四階段探討提高預型溫度、在預型中加入Caul Plate、以及將竹纖維先加熱再進行彎曲預型對竹纖維折角處拉伸強度的影響。研究結果顯示，提高預型溫度和先將竹纖維加熱再預型這兩種預型條件會導致竹纖維折角處拉伸強度下降。然而，在預型製程中加入Caul Plate對竹纖維折角處的拉伸強度沒有造成影響。

The objective of this study is to modify property of the bamboo fiber through surface treatment to increase its residual strength after bend forming. The effects of avocado oil, palm oil, soybean oil, and tung oil treatments on the water absorption, mechanical properties, and bonding strength with resin were compared for bamboo fibers. Furthermore, the impact of oil temperature on the mechanical properties and water absorption of bamboo fibers was investigated. The results showed that the bamboo fibers treated with palm oil had the best hydrophobicity and bonding strength with resin, and the second-best mechanical properties. As the temperature of the oil treatment increased, the hydrophobicity of the bamboo fibers improved, but their mechanical properties decreased. Therefore, in this study, palm oil treatment at 150 °C was chosen as the oil treatment process. Subsequently, the influence of surface treatment on tensile strength of angle bend fiber was investigated. The results showed that bamboo fiber treated with palm oil before preforming was able to improve the tensile strength of the angle bend fiber.

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