New method for determining the degree of cellulose I crystallinity by means of FT Raman spectroscopy
New method for determining the degree of cellulose I crystallinity by means of FT Raman spectroscopy
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DOI：
10.1007/s10570-004-3885-6
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发表时间：
2005-06-01
期刊：
影响因子：
5.7
通讯作者：
Brendler, E
中科院分区：
文献类型：
--
作者：
Schenzel, K;Fischer, S;Brendler, E
利用 CH2 弯曲模式的结晶度依赖性，创建了表征部分结晶纤维素 I 样品结晶度的拉曼结晶度指数 - Xc(Raman)。为了校准，制备了含有不同质量分数的结晶纤维素 I 及其无定形形式的物理混合物。产生0至60%的结晶度。表征纤维素 I 的结晶和无定形部分的拉曼线 I-1481 (cm-1) 和 I-1462 (cm-1) 的相对强度比与混合物中结晶纤维素 I 的质量分数线性相关。不同来源和不同结晶度的微晶纤维素的Xc(拉曼)值与NMR光谱获得的结果(Xc(NMR)值)合理相关。
A Raman crystallinity index - Xc(Raman) - characterizing the degree of crystallinity of partially crystalline cellulose I samples was created, utilizing the crystallinity dependence of CH2 bending modes. For calibration, physical mixtures containing different mass fractions of crystalline cellulose I and its amorphous form were prepared. Crystallinities from 0 to 60% were generated. Relative intensity ratios of the Raman lines I-1481 (cm-1) and I-1462 (cm-1) characterizing crystalline and amorphous parts of cellulose I correlated linearly with the mass fraction of crystalline cellulose I of the mixtures. Xc(Raman) values of microcrystalline celluloses of different origins and varying degree of crystallinity correlated reasonably with results obtained from NMR spectroscopy (Xc(NMR) values).