对壳聚糖均相接枝L-谷氨酸甲酯产物的结构和性能进行了研究.IR、CP/MAS13CNMR结果表明,谷氨酸甲酯侧链通过酰胺键与壳聚糖结合,形成了梳状接枝产物.XRD谱图中,在2θ=8.3°处出现衍射峰,这是因接入侧链使壳聚糖主链堆砌结构发生改变而引起的.DSC、TG/DTG测试发现,均相接枝物高温一侧吸放热峰的数量与位置有明显改变,并互有不同,反映出结构和接枝量的差异使壳聚糖接枝产物具有不同的热稳定性.
The structure and properties of chitosan homogeneously grafted by methyl L-glutamate are studied. IR and CP/MAS13CNMR results show that the methyl L-glutamate side chains are bonded with chitosan through amide bond to form comb-like graft products. In XRD spectrum, new diffraction peak appearing at 2θ=8. 3° is the result of chitosan main chain structure change caused by the grafted side chains. DSC, TG/DTG testing show that the quantity and location of exothermic peak of homogeneous graft products show more significant changes at high temperature side, and each is different, reflecting that chitosan graft products have different thermal stability because of different structure and the grafting number.
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