Abstract

本研究分別將丁苯橡膠(SBR)及丁二烯橡膠(BR)混摻於熱塑性聚氨酯彈性體(TPU)，製備成熱塑性硫化彈性體，簡稱TPUSBR及TPUBR，並探討其在不同混摻比例下之硫化行為、相容性、耐熱性、機械性質、耐磨性及發泡形態。實驗分析結果顯示，塑譜儀混練程序中，其平衡扭力值受橡膠交聯度所影響，其交聯度越高扭力值越大，與TPU共混時，橡膠混摻比例須控制於60%以內以避免產生裂化狀況。動態機械性質分析方面，TPU與SBR混摻出現單一阻尼特性峰，表示其相容性佳。TPU/BR方面，其顯示有兩個特性峰，且隨著橡膠比例不同而有位移之情形，說明TPU與BR為不相容體系但存在分子間相互作用力。耐熱性質方面，TPU隨著橡膠比例之增加，熱裂解溫度也隨之上升。機械性質方面，TPU之抗拉強度與延伸率隨著橡膠混摻比例之增加而降低。耐磨性方面，TPU隨著橡膠之混摻明顯提升耐磨耗性。發泡性質方面，TPU/SBR與TPU/BR皆可順利進行發泡，且發泡孔徑隨著橡膠比例增加而有細緻化之現象。

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