• 作者： --
• 中文摘要： 應用聚胺基甲酸酯(poslyurethane, PU)預聚物( prepolymer)上的異氰酸基(isocyanate group)在錫鹽類的催化作用下與環氧樹脂(DGEBA)上懸掛之二級氫氧基(Pendant secondary hydroxyl group) 作用而生成胺基甲酸脂鍵(Urethane group)。因此, 藉此種反應在環氧樹脂中引入 PU 橡膠而製件備成PU改質環氧樹脂 ( PU-crosslinked epoxy resin), 並加以比較其性質上的差異。由機械性質(stress-strain property)的分析, 得知不管PU的鏈長大小, 當PU/Epoxy組成分在 15/85wt%時, 會出現一極大抗張強度 (tensile strength), 比其兩個別成分之抗張強度為大。由動態黏彈性質(dynamic mechanical property), 得知未改質的環氧樹脂其E"(loss modulus)曲線具有二個明顯的轉移溫度, 而以PU改質之環氧樹脂發現並未明顯的改變此二轉移溫度。另外, 由掃描式電子顯微鏡(SEM)照片顯示在PU/Epoxy低重量百分比組成時, 並沒有PU橡膠粒子的沈澱, 因此關於PU改質環氧樹脂的耐衝擊性質並沒有獲得滿意的改善。
• 英文摘要： The reaction of the pendant secondary hydroxyl group in epoxy resin with the isocyanate group present in the polyurthane prepolymer was carried out. Reaction of this kind is employed to introduce polyurethane (PU) into epoxy resin for the preparation of PU-modified epoxy resin, with comparisons given in terms of qualitative differences. Analysis made with regard to stress-strain property indicate that regardless of the length of the PU chain, there will occur a maximum tensile strength which is greater than that of either of the individual strengths of PU and epoxy when their ratio reaches 15/85% by weight. The dynamic mechanical analysis reveals that the loss modulus (E'') of unmodified epoxy resin gives rise to two obvious transition temperatures, which appear even with epoxy resin that has been duly modified with PU. Photomicrographs of scanning electron microscopy (SEM) show that there has not been any precipitation of PU particles, indicating no satisfactory improvement in the impact property of the PU-modified epoxy resins.
• 中文關鍵字： 聚胺基甲酸乙酯交聯環氧樹脂; 環氧樹脂; 動態機械性質; 耐衝擊性質; 形態學
• 英文關鍵字： Polyurethane-Crosslinked Epoxy; Epoxy; Dynamic Mechanical Property; Impact Property; Morphology