在本研究中將使用具有長脂肪鏈段之酸酐型硬化劑(Long Chain Hardener)作為環氧樹脂的增軔劑，增進其斷裂韌性以及其他機械性能。因此為化學性增韌的緣故，在環氧樹脂-酸酐的反應系統中可達到反應前為均相，反應後也不會有分相的情況發生。首先我們利用FTIR、NMR、MASS等光譜儀分析Long Chain Hardener之官能基以及脂肪鏈段在結構中的分佈情形，接著用DSC、TGA、DMA進行加工條件與熱性質之分析，機械性能則利用拉伸試驗、三點彎曲測試，IZOD衝擊試驗確認衝擊強度的改變。我們發現具有軟性鏈段分子的結構雖然會使玻璃轉移溫度下降，但其拉伸、抗彎性能在一定比例下均有所提升，耐衝擊性能也隨軟鏈段添加比例上升而提升。原因在於軟性結構含量與交聯密度之間相互影響所造成。實驗結果也顯示軟性鏈段在玻璃態結構中可提升其斷裂韌性但又不使其失去主要的機械性能。

In this study, an anhydride-typed Long Chain Hardener with aliphatic chains will be used to improve epoxy fracture toughness and other mechanical properties. For the sake of chemical toughening,the liquid phase can be homogeneous before curing reaction start and no phase separation happen in epoxy-anhydride network. We use FTIR, NMR, MASS to determinate Long Chain Hardener functional groups and aliphatic chains in the structure of the distribution.Then use DSC, TGA, DMA to analyze processing conditions and thermal properties, the mechanical properties of the use of tensile test, three-point bending and IZOD impact test to confirm the impact strength. We found that the structure with soft segments will decrease the glass transition temperature. However the tensile, bending performance improved and impact resistance also increased. This is caused by chemical structure and cross-linking density. The experimental results also show that the soft chains can enhance its fracture toughness in the glassy state without losing its main mechanical properties.

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