| 不同结晶度聚乙烯醇水凝胶中水氢键缺损的拉曼光谱学研究 |
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| 引用本文： | 郭兴林,李福绵,张树霖.不同结晶度聚乙烯醇水凝胶中水氢键缺损的拉曼光谱学研究[J].高分子学报,2001(3):408-411. |
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| 作者姓名： | 郭兴林 李福绵 张树霖 |
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| 作者单位： | 1. 北京大学化学与分子工程学院高分子科学与工程系
2. 北京大学物理系 |
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| 基金项目： | 国家自然科学基金资助项目 !(基金号 5 9773 0 18和 5 963 3 0 2 0 ) |
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| 摘 要： | 聚乙烯醇 (ＰＶＡ)是一种水溶性高分子 ,它在一定条件下可以部分结晶形成水凝胶 ,其结晶度必然影响其机械性能及水在水凝胶中的状态 .部分结晶交联所得的ＰＶＡ水凝胶 ,由于无毒、机械性能好常用来作为生物医用材料 ,如接触眼镜、人工关节润滑软骨等1,2 ] .水凝胶是轻度交联的高分子网络 ,其内含有大量的水 ,高分子交联网络与水之间的相互作用决定着水凝胶的物理性质和化学性质3 ,4 ] .一般认为 ,水凝胶中的水以三种状态存在 ,即键合水 (Ｂｏｕｎｄｗａｔｅｒ)、自由水 (Ｆｒｅｅｗａｔｅｒ)和间隙水 (Ｉｎｔｅｒｓｔｉｔｉａｌｗａｔｅｒ…
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| 关 键 词： | 拉曼光谱 冷冻解冻(FT)方法 PVA 水凝胶 聚集谱带 氢键缺陷 结晶度 |
| 修稿时间： | 2000年11月10 |
HYDROGEN-BOND DEFECT OF WATER IN PVA HYDROGELS BY RAMAN SPECTRAL ANALYSIS |
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| Guo Xinglin,LI Fumian,ZHANG Shulin.HYDROGEN-BOND DEFECT OF WATER IN PVA HYDROGELS BY RAMAN SPECTRAL ANALYSIS[J].Acta Polymerica Sinica,2001(3):408-411. |
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| Authors: | Guo Xinglin LI Fumian ZHANG Shulin |
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| Abstract: | The hydrogen\|bond defect of water in PVA hydrogels was studied by Raman spectral analysis. The PVA hydrogels were prepared from PVA of different DP in different concentrations via freeze/thawed method.It was found that the hydrogen bond defect of water in PVA hydrogels is affected by their crystallinity which was depended on the molecular weight and concentration of PVA and also the number of freeze/thawed cycles.After swelling in water for 24?h,partial VA units were released from the crystalline regions,this means that more `free' VA units could bond with water in PVA hydrogels,causing the decrease of C value and the increase of N value. |
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| Keywords: | Raman spectra Freeze/thawed method PVA hydrogels Collective band Hydrogen bond defect Crystallinity |
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