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OALib Journal期刊
ISSN: 2333-9721
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tempo氧化体系氧化棉纤维的动力学研究
DOI: 10.3969/j.jssn.1000-2006.2011.02.020, PP. 93-98
Keywords: 棉纤维,tempo氧化,动力学,活化能
Abstract:
研究了2,2,6,6-四甲基哌啶氧化物自由基(tempo)/naclo/nabr氧化体系氧化棉纤维的动力学。结果表明，tempo/naclo/nabr氧化体系对棉纤维的氧化可用基于纤维素特殊结构的两个一级反应动力学来描述：即无定形区和结晶区的动力学过程。在所用的tempo浓度范围内，氧化反应速率与tempo的浓度成正比。在较低浓度时，氧化反应速率与nabr用量也成正比，但nabr浓度超过1？0mmol/g时，氧化反应速率不随nabr浓度增大而增大。温度对氧化反应速率常数的影响可以用arrhenius方程来描述，并由arrhenius方程求得棉纤维的表观活化能为56？66kj/mol。
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