溶膠－凝膠法製備不同混成比例及催化劑濃度之PVA／Silica混成材料

Preparation of PVA/Silica Hybrids by Sol-Gel Process with Various Blending Ratios and Catalyst Concentrations

宋憶青(I-Ching Sung) ； 李文昭(Wen-Jau Lee) ； 劉正字(Cheng-Tzu Liu)

《林產工業》 24卷2期 (2005/06) Pp. 147-159

https://doi.org/10.6561/FPI.2005.24.(2).6

摘要

本研究旨在探討不同PVA/TEOS混成比例及不同催化劑濃度之反應條件下，製備之PVA/Silica混成材料之性質。本研究在酸性催化劑之反應條件下，使四乙基矽氧烷（Tetraethoxysilane, TEOS）進行溶膠－凝膠反應，嘗試將無機矽成分導入聚乙烯醇（Polyvinyl alcohol, PVA）便形成PVA/Silica混成材料，期藉此改善PVA之耐水性、拉伸性質及耐熱性等性質。由實驗結果得知，PVA/Silica混成材料均呈透明狀，顯示有機相與無機相間相容性良好。其混成材料之耐水性較純PVA者明顯提升，且隨TEOS添加比例增加而提高。由FT-IR分析結果顯示，PVA/silica混成材料之Si-O-Si鍵結之吸收峰隨TEOS含量及酸催化劑使用量增加而增強。由拉伸性質顯示混成材料之強度較純PVA者明顯提升，並隨TEOS比例之增加而提高。熱重分析（TG）及導數熱重損失曲線（DTG）之結果顯示，PVA/Silica混成材料之熱重損失明顯低於PVA，且隨TEOS含量增加，其重量損失率減少，且熱裂解溫度向高溫側偏移，顯示無機相對PVA之耐熱性有明顯之助益。

關鍵字

溶膠－凝膠反應 ； 有機－無機混成材料 ； 聚乙烯醇 ； 四乙基矽氧烷

並列摘要

The purpose of this study was to discuss the properties of PVA/Silica hybrids by various blending ratios and catalyst concentrations. In this study, the inorganic silica was tried to introduce into the polyvinyl alcohol by the sol-gel reaction of tetraethoxysilane (TEOS) under acid condition to form the PVA/silica hybrids to improve the water resistance, tensile properties and thermal stability of polyvinyl alcohol. The films of PVA/Silica hybrids prepared in this study had good transparency, indicating there had good compatibility between the organic phase and inorganic phase in the hybrids. The water resistance of PVA/Silica hybrids was better than pure PVA, and the more TEOS content the higher water resistance would be. FT-IR spectra reviewed that the intensity of Si-O-Si absorb peak would increase as increasing the TEOS content and acid catalyst concentration. The tensile strength of PVA/Silica hybrids was higher than pure PVA, and it would be increased significantly with increasing the TEOS content. By the results of TG and DTG analysis, the percent of weight loss of PVA/Silica hybrids was lower than pure PVA. With increasing the TEOS content the weight loss of hybrids would be deceased and the thermal degradation would shifted to higher temperature, indicating that the inorganic phase would improve the thermal stability of PYA.

並列關鍵字

Sol-gel reaction ； Organic-inorganic hybrid ； Polyvinyl alcohol ； Tetraethoxysilane.