互穿型網狀高分子水膠因其具備有較高的機械強度及含水量，可被更廣泛的應用，受到了極高的重視。本研究，成功製備出互穿型網狀高分子水膠，利用聚乙烯醇與戊二醛進行縮合反應，並導入海藻酸鈉作為提升膨潤度的高分子，製備出第一階段的水膠；第二階段的水膠，則利用甲基丙烯酸羥乙酯進行自由基聚合反應。本研究合成了HEGMA，用以交鏈第二種水膠HEMA。此外，我們分別利用分子量8.9萬與13萬的聚乙烯醇來製備水膠，並探討其機械性質與熱性質的差別；於相同條件下，經由拉伸測試，可知分子量較高的聚乙烯醇，其機械強度較佳。此外，隨著海藻酸鈉的含量增加，可使得最佳拉伸率可達到300%，壓縮應力也可達到1.54MPa。由壓縮試驗中可得知，互穿型網狀高分子水膠，其應力大於只有第一階段交鏈的水膠；同時由熱重分析得知，分子量較大的聚乙烯醇與經互穿型網狀高分子水膠，其10wt%重量損失溫度有顯著提高。從實驗結果得知，當海藻酸鈉的含量增加，其含水量增加，並且在一定含量的海藻酸鈉，其可呈現最佳的機械性質。又，化學鍵結的導入，可明顯的提升高分子水膠的機械強度。

　　Interpenetrating polymer network (IPN) hydrogels have gained much attention in the last decades, due to their high mechanical strength and toughness with high water content. In this research, we successfully prepared the full-IPN hydrogel using polyvinyl alcohol (PVA) as the first network, SA was used to increase the space of PVA network, and 2-hydroxyethyl methacrylate (HEMA) was used to synthesize the second network. HEGMA was synthesized for the crosslinking of the second network. In the process, sodium alginate (SA) was used as a semi-interpenetrating polymer network. By using the method, water content of the synthesized hydrogel was improved to 80-90wt%. Both 89k and 130k molecular weight PVA were used. It was found that tensile properties of the hydrogel prepared from PVA130k were higher than those of PVA89k. Increase of SA content increases the fracture strain and optimal 300% strain, 160kPa tensile stress, and 1.54MPa compressive stress of the synthesized hydrogel were achieved. From the thermogravimetric analysis, the temperatures of 10% weight loss( T10%) for semi-IPN-PVA130k and full-IPN hydrogel-PVA130k were estimated at 185.7℃ and 325.5℃, respectively. The results suggest that thermal stability of full-IPN was much higher than that of semi-IPN. From the results observed in this study, we conclude that adding of SA increases the water content effectively, chemical bonding in full-IPN network enhances the mechanical properties of hydrogels significantly.

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