製備不同奈米纖維素之混摻PU對其物性測試

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Title:	製備不同奈米纖維素之混摻PU對其物性測試 Preparation of Different Nano Cellulose Mixed PU for Physcial Property Test
Authors:	余柏賢
Contributors:	化學工程與材料工程學系奈米材料碩士班
Keywords:	水性聚氨酯奈米纖維素 TEMPO氧化法硫酸水解法 Waterborne polyurethane nanocellulose TEMPO oxidation method sulfuric acid hydrolysis method
Date:	2020
Issue Date:	2020-08-17 14:26:57 (UTC+8)
Abstract:	本研究採用胡蘿蔔渣及紙漿經硫酸水解法及TEMPO氧化法製備奈米纖維素，並對於不同來源奈米纖維素進行性質測試；並製備陰離子水性聚氨酯並與市售水性聚氨酯W-436的水溶液性質測試，並添加不同來源奈米纖維素製備複合膜後進行薄膜性質測試。經實驗得知，胡蘿蔔渣及紙漿經由硫酸水解法與TEMPO氧化法皆可從SEM中看到奈米纖維素達到0.5μm以下，聚合度明顯下降其分子變小。未經化學法處理時胡蘿蔔渣其熱裂解為180~210°C，TEMPO氧化後的奈米纖維素的熱損失在150~250°C，硫酸水解後在200~250°C有明顯的熱重損失且具有良好的耐溶劑性。經FT-IR測試中可得知，本研究成功製備陰離子水性聚氨酯，在水溶液測試中，陰離子水性聚氨酯與市售水性聚氨酯皆有降低表面張力效果、低起泡性、較小的粒徑、耐鹼不耐酸、具有較好的酸性緩衝能力。不同來源奈米纖維素複合膜經性質測試，可得知HEDT、W-436隨著添加奈米纖維素其熱裂解溫度降低，薄膜在水中的重量保留率提升、光澤度下降、硬度上升、機械性能上升。 In this study carrot and pulp were prepared by sulfuric acid hydrolysis and TEMPO oxidation to prepare nanocellulose for properties of nanocellulose from different sources were tested. Anionic waterborne polyurethane was prepared and compared with the aqueous solution properties of commercially available waterborne polyurethane W-436. After testing adding nanocellulose from different sources to prepare a composite membrane to test membrane properties. According to the experiment the carrot residue and pulp can be seen from the SEM through the sulfuric acid hydrolysis method with the TEMPO oxidation method. Nanocellulose reaches 0.5 μm or less and the degree of polymerization is significantly reduced. The molecule becomes smaller. Without chemical treatment carrot residue is pyrolyzed to 180-210°C. The heat loss of nanocellulose after TEMPO oxidation is 150-250°C. After sulfuric acid hydrolysis there is a significant thermal weight at 200-250°C. It can be known from the FT-IR test that anionic waterborne polyurethane was successfully prepared in this study. In the aqueous solution test, both the anionic waterborne polyurethane and the commercially available waterborne polyurethane have the effect of reducing surface tension, low foaming, small particle size, and alkali resistance. Acid resistant, with good acid buffer capacity. After testing the properties of nanocellulose composite membranes from different sources, it can be seen that with the addition of nanocellulose, the thermal cracking temperature of HEDT and W-436 decreases, the weight retention of the film in water increases, gloss decreases, hardness increases and the mechanical properties performance increased.
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