利用ESCA对苯基异氰酸酯与不同含水率纤维素反应的研究

The ESCA Study on the Reaction of Benzyl Isocyanate and Cellulose with Different Moisture Contents

通过ESCA分析研究 ,确定纤维素的C1S电子结合能在 2 85 95eV左右只有一个对称单峰 ;苯基异氰酸酯与水反应产物N ,N -二苯基取代脲的C1S电子结合能有 2个峰值 ,分别是 :羰基 (2 88 6± 0 1)eV ,苯环峰 (2 84 7±0 1)eV ;随着纤维素含水率的增加 ,苯基异氰酸酯与水反应的比例越来越多 ,当含水率为 9 78%的纤维素与苯基异氰酸酯反应时 ,与水反应的异氰酸酯基占总消耗异氰酸酯基的 92 98%。通过刻蚀技术研究发现 ,苯基异氰酸酯反应产物主要分布于纤维素的表面。

The ESCA study indicated that the C 1S peak of cellulose is only one symmetrical contribution at 285.95 eV. While the C 1S peaks of N,N-dibenzylurea, the reaction resultant of phenyl isocyanate and water, has two contributions at (288.6±0.1)eV and (284.7±0.1)eV corresponding to the carbonyl group and phenyl ring group respectively. With the moisture content (MC) of cellulose increased, the proportion of isocyanate reacted with water is increasing. 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.