簡介
Polyurethane thermoplastics 通常被稱為 熱塑性聚氨酯 (TPU)，這是一系列可熔融加工的 polyurethane elastomers，兼具橡膠般的彈性與熱塑性可再加工性。它們在塑膠產業中佔有重要地位，因為它們能像熱塑性塑膠一樣進行模塑、擠出及回收，同時仍具備高耐磨性、韌性、柔韌性以及良好的低溫性能。
在更廣泛的 polyurethane 領域中，TPU 屬於熱塑性分支，與許多會不可逆固化的熱固性 polyurethane 材料形成對比。該材料的性能來自於分段嵌段共聚物結構：柔軟的軟段提供彈性，而硬段則形成物理交聯，貢獻強度、尺寸穩定性及抗撕裂性。
TPU 已發展成為高度多功能的平台材料，涵蓋多種化學家族，最 notable 的包括 聚酯基、聚醚基 以及 聚己內酯基 等級，每種等級在耐水解性、柔韌性與加工性之間的平衡各有不同。這種可調性使 TPU 成為從鞋類、電纜護套、軟管、密封件、薄膜，到醫療管材、穿戴裝置、防護外殼及工業零組件等產品的核心材料。
永續性仍是 TPU 的關鍵議題。該材料在機械上耐用且原則上可透過機械再加工回收，但仍高度依賴石化原料，且許多等級使用異氰酸酯化學，伴隨相關環境與職業安全管制。因此，目前創新主要集中在生物基多元醇、低碳生產路線、適合回收的配方，以及設計用於更長使用壽命與更容易回收的 TPU 系統。
歷史與發展
聚氨酯最早於 1930 年代開發，而 TPU 是最早能以熱塑性方法加工的彈性體 polyurethane 形式之一。隨著塑膠產業尋求能在高要求應用中取代橡膠、且無需傳統 elastomers 較慢固化週期的材料，其重要性隨之提升。
TPU 的商業擴張伴隨二異氰酸酯化學、多元醇選擇及反應加工控制的進步，使硬度、彈性與熱行為得以在寬廣範圍內調整。因此，TPU 從特殊彈性體演變為廣泛應用於消費品、汽車、醫療及工業領域的主要工程材料。
化學結構與關鍵特性（技術概觀）
TPU 是一種由二異氰酸酯與一種或多種二醇（通常包括長鏈多元醇與短鏈 chain extender）反應形成的 分段嵌段共聚物。這種架構產生軟域與硬域之間的微相分離，這正是 TPU 能兼具彈性與強度的分子基礎。
結構-性能關係
- 軟段 提升柔韌性、伸長率與低溫性能。
- 硬段 透過氫鍵與物理聚集提升模數、硬度、抗撕裂強度與耐熱性。
- 增加硬段含量通常會提高抗拉強度與剛性，而增加軟段含量則改善伸展性與柔軟度。
典型性能概況
| 性能 | 典型 TPU 範圍或行為 |
|---|---|
| 彈性 | 高，類似橡膠的回復 |
| 抗拉強度 | 常以數十 MPa 報告，視等級與配方而定 |
| 斷裂伸長率 | 常達數百百分比，許多等級可達 300% 至 600% 或更高 |
| 硬度 | 可從軟彈性體等級廣泛調整至較硬的工程等級 |
| 低溫性能 | 相對於許多塑膠與 rubbers 表現優異 |
| 耐磨性 | 極佳 |
| 耐油脂性 | 一般良好至極佳，尤其相較許多 elastomers |
實際限制與實務因應
- 氧氣與油脂阻隔性能差 → TPU 本質上不是高阻隔包裝聚合物 → 因應措施： 使用多層結構、阻隔 coatings，或將 TPU 與阻隔材料混合/層壓。
- 處理前表面能低 → 某些 TPU 等級若未經表面活化，則難以黏合、印刷或塗佈 → 因應措施： 電暈處理、電漿處理、底漆或相容黏合層可改善附著力。
- 某些化學結構對水解敏感 → 聚酯基 TPU 隨時間對濕氣與熱較脆弱 → 因應措施： 在潮濕或水解環境中選擇聚醚基或聚碳酸酯基等級。
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