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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of chitosan alkyl carbamates
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Synthesis and characterization of chitosan alkyl carbamates

机译：壳聚糖氨基甲酸烷基酯的合成与表征

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The synthesis of chitosan methylcarbamate (ChMC) and ethylcarbamate (ChEC) is described by using a new methodology. Polymers with substitution degrees up to 63% for ChEC and 68.5% for ChMC were obtained. Derivatives with lower substitutions were acid soluble but those with higher ones were completely insoluble. This could be due to the loss in hydrophilic sites when the substitution degree increases. The reaction conditions and degree of substitution obtained for both derivatives were also described. A complete chemical characterization was carried out by spectroscopic techniques. The thermal degradation of chitosan and derivatives were studied in the range 25-500 degreesC and both derivatives were shown to be thermally less stable than chitosan. (C) 2002 Wiley Periodicals, Inc. [References: 14]
机译：使用一种新方法描述了壳聚糖甲基氨基甲酸酯（ChMC）和氨基甲酸乙酯（ChEC）的合成。得到的聚合物的取代度对ChEC高达63％，对ChMC高达68.5％。具有较低取代基的衍生物是酸可溶的，但是具有较高取代基的那些则是完全不溶的。这可能是由于当取代度增加时亲水位点的损失。还描述了两种衍生物的反应条件和取代度。通过光谱技术进行了完整的化学表征。在25-500℃的范围内研究了壳聚糖及其衍生物的热降解，显示这两种衍生物的热稳定性均低于壳聚糖。 （C）2002 Wiley Periodicals，Inc. [参考：14]

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