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Quantitative analysis of cellulose acetate with a high degree of substitution by FTIR and its application
Analytical Methods ( IF 2.7 ) Pub Date : 2017-10-09 00:00:00 , DOI: 10.1039/c7ay02165h Pengfei Fei 1, 2, 3, 4 , Liang Liao 2, 3, 4, 5 , Bowen Cheng 1, 2, 3, 4, 5 , Jun Song 1, 2, 3, 4, 5
Analytical Methods ( IF 2.7 ) Pub Date : 2017-10-09 00:00:00 , DOI: 10.1039/c7ay02165h Pengfei Fei 1, 2, 3, 4 , Liang Liao 2, 3, 4, 5 , Bowen Cheng 1, 2, 3, 4, 5 , Jun Song 1, 2, 3, 4, 5
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The degree of substitution (DS) of highly acetylated cellulose acetate (CA) was quantitatively evaluated by FTIR. Seven standard samples, the DS ranging from 1.80 to 2.85, prepared by mixing appropriate amounts of commercial cellulose triacetate and commercial cellulose were analyzed for their DS by a FTIR method, and the relationship between the DS and the ratios of specific peak absorbance intensity or integral area calculated from FTIR spectra was confirmed to be a polynomial fitting of the second degree. The DS values of CA prepared by heterogeneous acetylation under different conditions determined by FTIR based on the resulting quadratic polynomial equations were compared with those determined by a titration method. The results showed that the DS value was well predicted by FTIR spectra and the average percentage errors were lower than 2.31%. The specific peak parameter ratio can effectively evaluate and monitor the acetylation process. Additionally, the results of dynamic analysis indicated that the heterogeneous acetylation reaction followed a second-order kinetic model when the DS value exceeded 2.0.
中文翻译：
FTIR高取代度醋酸纤维素的定量分析及其应用
通过FTIR定量评价高度乙酰化的乙酸纤维素（CA）的取代度（DS）。通过FTIR法分析了通过混合适量的商品三乙酸纤维素和商品纤维素制得的七个标准样品（DS范围为1.80至2.85）的DS，并确定了DS与比峰吸收强度比值或积分值之间的关系。由FTIR光谱计算出的面积被确认为第二级的多项式拟合。比较了根据所得二次多项式方程在FTIR测定的不同条件下通过异质乙酰化制得的CA的DS值与通过滴定法测定的CA的DS值。结果表明，FTIR光谱能很好地预测DS值，平均百分误差低于2.31％。特定的峰参数比可以有效地评估和监测乙酰化过程。另外，动力学分析结果表明，当DS值超过2.0时，异质乙酰化反应遵循二级动力学模型。
更新日期：2017-11-09
中文翻译：
FTIR高取代度醋酸纤维素的定量分析及其应用
通过FTIR定量评价高度乙酰化的乙酸纤维素（CA）的取代度（DS）。通过FTIR法分析了通过混合适量的商品三乙酸纤维素和商品纤维素制得的七个标准样品（DS范围为1.80至2.85）的DS，并确定了DS与比峰吸收强度比值或积分值之间的关系。由FTIR光谱计算出的面积被确认为第二级的多项式拟合。比较了根据所得二次多项式方程在FTIR测定的不同条件下通过异质乙酰化制得的CA的DS值与通过滴定法测定的CA的DS值。结果表明，FTIR光谱能很好地预测DS值，平均百分误差低于2.31％。特定的峰参数比可以有效地评估和监测乙酰化过程。另外，动力学分析结果表明，当DS值超过2.0时，异质乙酰化反应遵循二级动力学模型。
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