| Characterization the Reaction of Isocyanate and Cellulose by XPS |
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| 作者姓名： | GAO Zhenhua GU Jiyou LI ZhiguoCollege of Material Science and Engineering Northeast Forestry Univ. Harbin P.R. China |
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| 作者单位： | GAO Zhenhua GU Jiyou LI ZhiguoCollege of Material Science and Engineering，Northeast Forestry Univ.，Harbin 150040，P.R. China |
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| 摘 要： | The practical occasions for isocyanate bonding to woodare often that of heat, high moisture or rich water.When isocyanate reacted with functional groups inwood, such as hydroxyl groups, it formed thecarbamate that fulfils isocyanates powerful chemicalbonding. Meanwhile, it reacted with water or its vapourand formed polyurea, which is a completing reactionwith that of forming carbamate(Rowell, et al., 1981).As a result, this completing reaction correlates to thefinal bonding performance of iso…
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| 关 键 词： | 异氰酸苯酯 纤维素 X-射线光电光谱学 水分含量 竞争作用 木材 |
Characterization the Reaction of Isocyanate and Cellulose by XPS |
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| GAO Zhenhua GU Jiyou LI ZhiguoCollege of Material Science and Engineering,Northeast Forestry Univ.,Harbin ,P.R. China.Characterization the Reaction of Isocyanate and Cellulose by XPS[J].中国林业科技(英文版),2004,3(2):41-48. |
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| Authors: | GAOZhenhua GUJiyou LIZhiguo |
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| Institution: | CollegeofMaterialScienceandEngineerine,NortheastForestryUniv., |
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| Abstract: | The X-ray photoelectron spectroscopy (XPS) technique was used to study the reaction of phenyl isocyanate and cellulose with different moisture contents (MC). The C1S XPS peak of cellulose is only one symmetrical contribution at 285.95 eV. While the C1S XPS peaks of N,N-dibenzylurea, the reaction resultant of phenyl isocyanate and water, have two contributions at 288.6±9.1 eV and 284.7±0.1 eV corresponding to the carbonyl group and phenyl ring group, respectively. Their area ratio is between 11.88 and 11,98 that is quite neat to the theoretical value of 12.0. With the moisture content (MC) of cellulose increased, the proportion of isocyanate reacted with water increased. When the MC reaches 9.78%, 92.98% of all consumed isocyanate will react with water. By spattering analysis, it reveals that the reaction resultants of benzyl isocyanate distribute mainly on the surface of cellulose. |
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| Keywords: | benzyl isocyanate cellulose moisture content competitive reaction ESCA analysis |
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