聚氨酯彈性體具有良好的生物相容性和物理化學性能，機械性能，由異氰酸酯和多元醇製成，具有許多潛在的應用。儘管今天聚氨酯的應用很多，但我們仍然希望增加聚氨酯的應用範圍。所以選擇這個方法來研究其特性。
在此次研究中，我們以四氫呋喃為溶劑用聚乙二醇(PEG2000)/二甲基矽氧烷(PDMS4200)與對苯二異氰酸酯反應，以二月桂酸二丁基錫為催化劑生成預聚物，再與對苯二甲醇反應生成聚氨酯。分別以傅立葉紅外線光譜儀（FTIR)、高效能高分子色譜 (APC)、核磁共振光譜儀(1H-NMR)、熱重分析(TGA)、熱差分析(DSC) 以和拉伸試驗等來判斷聚氨酯結構與特性測定。
合成的熱塑性聚氨酯斷裂伸長率為約2500％是相當高的。在未來的發展中可以將其視為減震器或抗變形材料。

Polyurethane elastomers which are made of isocyanate and polyol exhibit good biocompatibility, physical and chemical properties and mechanical properties which leads to numerous potential applications. Despite of a variety of applications of polyurethane today, the scope of application of polyurethanes has still continually increased.
In this study, polyethylene glycol (PEG2000) with the molecular weights of around 2000 g/mol as the soft segment and para-phenylene diisocyanate, para-xylylene glycol as the hard segments were used to synthesize the polyurethanes (PUs) by prepolymerization process. Molecular weights of polymers were controlled by varying the concentration of diisocyanate to polyol and DBTDL was used as catalyst for precise control over molecular weight. Anhydrous tetrahydrofuran was used as a non-reactive solvent. In addition, one-step synthesis of pre-polymerized PU were also prepared in order to compare to that of polymers generated by prepolymerization process. PUs prepared by different methods were characterized by advanced polymer chromatography, 1H NMR spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry and tensile test.
The developed synthesis resulted in the formation of thermoplastic polyurethane with an elongation at break of about 2500%, which is considerably high. This polymer can be considered for using in a shock absorber or anti-deformation material in the near future.

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