| 酸性环境下脲醛树脂结构形成特征 |
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| 引用本文： | 杜官本.酸性环境下脲醛树脂结构形成特征[J].西南林学院学报,1999,19(2):126-130,138. |
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| 作者姓名： | 杜官本 |
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| 作者单位： | 西南林学院林业工程学院,昆明,650224 |
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| 基金项目： | 云南省应用基础研究基金 |
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| 摘 要： | 使用１３ ＣＮＭＲ研究酸性环境下脲醛树脂结构形成特征，结果表明：酸性条件下所合成的脲醛树脂与传统脲醛树脂结构差异显著．在强酸条件下，由于亚甲基化速度高于羟甲基化速度，尿素的加入以形成亚甲基桥键为主，或者说形成的羟甲基迅速转化为亚甲基桥键．强酸条件下合成的脲醛树脂结构中存在Ｕｒｏｎ 环，其分子链交联点较多．在弱酸条件下，由于亚甲基化速度和羟甲基化速度基本相近，产物结构特征介于强酸与传统合成工艺之间．
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| 关 键 词： | 脲醛树脂 酸性环境 结构 ~(13)CNMR |
| 修稿时间： | 1999年2月5日 |
The Structure Formation of UF Resins Under Acidic Condition |
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| Du Guanben.The Structure Formation of UF Resins Under Acidic Condition[J].Journal of Southwest Forestry College,1999,19(2):126-130,138. |
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| Authors: | Du Guanben |
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| Abstract: | Structure formation of UF resins under strong and weak acidic conditions were investigated with high resolution 13 CNMR (DRX-500).The structures of resins prepared under acidic conditions was difference greatly with typical UF resin.The crucial factor seems to be the different reaction rate of methlolation and methylene bond formation.Under strong acidic condition,methylene bond formation is fast than methlolation,so the main constituents of UF resins are contents with much high methylene.Strong acid catalyzed UF resin characters as Uron and high cross linkages contain.Under weakly acidic conditions,since methlolation and methylene bond formation go with almost equivalent rate,the structure constituents of resin seem to be average of typical resin and strong acidic catalyzed resin. |
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| Keywords: | Urea formaldehyde resins Acidic condition Structure 13 C NMR |
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