近红外光谱测定聚四氢呋喃混合液

Near Infrared Spectroscopic Analysis of Tetrahydrofuran Polyreaction

采用近红外光谱技术对四氢呋喃聚合反应过程中聚四氢呋喃混合液的固含量及其分子质量等进行了在线测定。利用偏最小二乘(PLS)校正方法,并通过模型优化所建立的聚四氢呋喃混合液的固含量及其分子质量的校正模型的决定系数R分别为0.998 6和0.993 6,交叉验证均方差RMSECV分别为0.455和59.7。利用外部验证集,对模型进行t检验的结果分别为0.44和1.01,小于显著水平为0.05时的t分布值(t0.05(20)=2.09),说明近红外光谱和标准方法的测定结果不存在显著性差异。

The solid content and the mol.ecular mass of the polymer in mixed poly-tetrahydrofuran liquids were determined online by near-infrared spectroscopy （NIR） to explore the real-time monitoring of the polymerization process of tetrahydrofuran. The coefficients （R） of calibration models of the solid content and the molecular mass of the polymer derived by the partial least square method are 0. 998 6 and 0. 993 6 respectively, root mean square errors of crosss-verification（RMSECV） are 0. 455 and 59.7. Based on external verification samples, the model was analyzed by means of t-verification. The results are 0.44 and 1.01, which are under the given significance level at 0. 05 （t0.05（20） =2.09） condition. Result of the near-infrared spectrum method was compared with that of standard method, and there existed no significance difference.