| 摘要: | 本研究以碳酸乙烯酯(Ethylene carbonate, EC)、己二胺(1,6-Hexamethylenediamine, HMDA)與二羧酸(Diacid)合成聚脲與聚醯胺 n,m 共聚物，並改變二羧酸種類及不同比例之碳酸乙烯酯與二羧酸，合成一系列產物，合成產物經由 FT-IR、XRD、TGA、DSC、DMA、接觸角、吸水性測試，觀察其結構、熱性質及物性，並加以探討。
FT-IR 結果顯示二羧酸碳鏈長度越長，吸收峰強度越強，而隨著碳酸乙烯酯添加量的上升，原本在 3300cm-1 產生 N-H 伸縮振動峰，逐漸移動至聚脲特徵官能基中 3400cm-1 產生之 N-H 伸縮振動峰。研究結果表明合成產物皆有聚脲及聚醯胺之特徵吸收峰，說明產物順利合成。
XRD 結果顯示，隨著碳酸乙烯酯的添加，合成產物由原本的α1 和 α2 晶體逐漸被合併成一個大包峰，形成無定形狀態。由TGA 及 DSC 結果顯示，隨著二羧酸碳鏈越長，其裂解點越低，而熔點越高；添加碳酸乙烯酯後，裂解點與熔點皆有下降趨勢。隨著二羧酸碳鏈長度增加，有 Tg有上升的趨勢；而添加碳酸乙烯酯後，Tg 皆呈現下降。接觸角與吸水性結果有同樣趨勢，不同種類二羧酸對於接觸角與吸水性影響不大；添加碳酸乙烯酯後，接觸角越小且吸水性越高，合成產物皆為親水性聚合物。
This study focuses on the synthesis of polyurea and polyamide n,m copolymers using ethylene carbonate, 1,6-hexamethylenediamine, and diacid. Various products were synthesized by altering the type of diacid and the ratio of ethylene carbonate to diacid. The synthesized
products were subjected to FT-IR, XRD, TGA, DSC, DMA, contact angle, and water absorption tests to investigate their structural, thermal, and physical properties. The findings were analyzed and discussed.
The FT-IR analysis revealed that as the carbon chain length of the diacid increased, the intensity of absorption peaks became stronger. Additionally, with an increase in the amount of ethylene carbonate added, the N-H stretching vibration peak, originally observed at 3300 cm-1, gradually shifted to 3400 cm-1, corresponding to the characteristic functional groups of polyurea. These results indicate successful synthesis of the products, as evidenced by the presence of characteristic absorption peaks of both polyurea and polyamide.
The XRD results revealed that with the addition of ethylene carbonate, the synthesized products gradually transitioned from the original α1 and α2 crystalline phases to a merged broad peak, indicating an amorphous state. According to TGA and DSC results, as the carbon chain length of the diacid increased, the decomposition temperature decreased while the melting point increased; however, upon addition of ethylene carbonate, both the decomposition temperature and melting point exhibited a decreasing trend. With an increase in the carbon chain length of the diacid, the glass transition temperature (Tg) showed n upward trend, whereas after adding ethylene carbonate, Tg decreased. The contact angle and water absorption results displayed a
similar trend: different types of diacids had minimal impact on the contact angle and water absorption; however, after adding ethylene carbonate, the contact angle decreased and water absorption increased, indicating that the synthesized products were hydrophilic polymers. |
