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題名 | 以3,3',4,4'-二苯甲酮四羧基二酸酐改質聚氨基甲酸酯之熱性質與機械性質研究=A Study on the Thermal and Mechanical Properties of Modification of Polyurethane with 3,3',4,4'-Benzophenonetetracarboxylic Dianhydride |
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作者 | 許耀基; 曾雯卿; 林明芳; 莊富盛; | 書刊名 | 技術學刊 |
卷期 | 12:4 1997.12[民86.12] |
頁次 | 頁641-654 |
分類號 | 467.4 |
關鍵詞 | 聚氨基甲酸酯預聚合體; 聚氨基甲酸酯-醯亞胺共聚合體; 芳香族二酸酐; 玻璃轉移溫度; 軟鏈節; 硬鏈節; Polyurethane prepolymer; PU-imide copolymer; Aromatic dianhydride; Glass transition temperature; Soft segment; Hard segment; |
語文 | 中文(Chinese) |
中文摘要 | 本實驗中利用兩種不同分子量(1000,2000)之聚醚雙醇(PTMG)與4,4'-二苯甲 基二異氰酸酯( MDI ),先形成聚氨基甲酸酯( PU )預聚合體,再與四種不同比例之 3, 3', 4, 4'- 二苯甲酮四羧基二酸酐( 3, 3', 4, 4'-Benzophenonetracarboxylic dianhydride )製備八種聚氨基甲酸酯 - 醯亞胺( Polyurethane; PU-imide )共聚合體 。經測試結果得知;在固有黏度方面 PU-imide 共聚合體均較純 PU 聚合體高,意味有較高 之分子量。 熱性質方面, DSC 顯示 PU-imide 在 0 ℃以下有一個軟鏈節玻璃轉移溫度( Tgs )及 0 ℃以上有三個轉移溫度,即硬鏈節玻璃轉移溫度( Tgh );軟鏈節熔點( Tms )及硬鏈節熔點( Tmh ),但只有使用 PTMG 分子量 2000 之共聚合體才有 Tms, 而 Tgs 與軟鏈節含量無關,卻與軟鏈節長度有關。 在熱重分析( TGA )上,起始衰解溫度與軟鏈 節含量無關,卻與軟鏈節長度有關。 在熱重分析( TGA )上,起始衰解溫度與軟鏈節含量 及所使用之硬鏈節組成有關。機械性質方面,共聚合體抗張強度與模數均較傳統 PU 聚合體 佳。 |
英文摘要 | In this study, polyurethane propolymers were prepared from poly (tetramethylene glycol) (PTMG) of two different molecular weights (1000,2000) to react with 4,4'-diphenylene methane diisocyanate (MDI). Then, eight PU-imide copolymers were synthesized from these polyurethane prepolymers to react with aromatic 3, 3', 4, 4'-benzophenonetetracarboxylic dianhyride (BTDA) in four different ratios. From the results, it was found that the intrinsic viscosities and averge molecular weights of the PU-imide copolymers were higher than those of the intrinsic PU polymers, suggesting that the PU-imide copolymers had sufficiently high molecular weights. For thermal properties, the analysis of differential scanning calorimetry (DSC) showed that the PU-imide copolymers exhibited a glass transition temperature (Tgs) below 0 ℃ and had three transition temperatures (Tgh, Tms and Tmh) above 0 ℃. Only PU-imide copolymers of PTMG(2000) exhibited a Tms, and their Tgs's were independent of the soft segment content, but dependent on their soft segmental lengths. In addition, thermogravimetric analysis (TGA), showed that initial thermal degradation temperature was dependent on the soft segment content and the composition of the hard segment used. From mechanical property studies, it was found that both tensile strenghts and moduli of PU-imide copolymers were better than those of conventional PU. |
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