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題 名 | 聚乙烯醇之凝膠化及其形態=The Gelation and Morphology of Polyvinyl Alcohol |
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作 者 | 汪輝雄; 石天威; 胡美山; | 書刊名 | 中華民國紡織工程學會誌 |
卷 期 | 16:2 1998.11[民87.11] |
頁 次 | 頁19-30 |
分類號 | 467.4 |
關鍵詞 | 聚乙烯醇; 凝膠; 凝膠化; 液體-液體相分離; Polyvinyl alcohol; Gel; Gelation; Liquid-liquid phase separation; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究為以四種聚合度(1700,2000,2400,及2600)之聚乙烯醇聚合體,用硼酸為交鏈劑,以二甲基亞�憍M水為混合溶劑來製備化學交鏈之聚乙烯醇凝膠薄膜,並探討其凝膠化及其形態。由凝膠化測試結果得知,凝膠化所需時間隨凝膠化溫度之下降而減少。在凝膠化溫度低於0 ℃時,凝膠薄膜的可見光透過率較高,且凝膠化所需之聚乙烯醇濃度與凝膠化溫度無關,但其所需聚乙烯醇濃度則與聚合度呈負0.5次方關係。 另一方面,在0 ℃以上所形成之凝膠薄膜則呈混濁狀(乳白色),且薄膜的可見光透過率隨凝膠化溫度之增加而減少,但隨聚乙烯醇濃度的增加而增加。從X-射線廣角繞射照片得知,聚乙烯醇凝膠薄膜具有結晶性且由掃描式電子顯微鏡發現凝膠薄膜的凝膠狀態顯然受凝膠化中液體-液體相分離(liquid-liquid phase separation)作用而影響。 |
英文摘要 | The chemically cross-linked gel films of polyvinyl alcohol were made from the mixture solvent of dimethyl sulfoxide and water with boric acid as a cross-linking agent. The polyvinyl alcohol polymer with four kinds of degree of polymerization (P) (1700,2000,2400 and 2600) was used, and the gelation temperatures were between -15℃ and 70℃. From the experimental results, the gelation time is decreased with the decrease of gelation temperature. As the gelation temperature was below 0℃, the gels were nearly transparent, and also the polyvinyl alcohol concentration was independent of gelation temperature. Moreover, the minimum requirement of polyvinyl alcohol concentration to form a gel is proportional to P-0.5. On the contrary, as the gels were formed above 0℃, the films were opaque (milky white). The transmission of the visible light to films was decreased with the increase of gelation temperature. However, the light transmission was increased with an increment of polyvinyl alcohol concentration. As seen from the wide angle X-ray diffraction patterns, it exhibits crystal in gel. The morphology of the gel is significantly influenced by the liquid-liquid phase separation, as observed from the scanning electronic microscope. |
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