Determination of alcoholysis degree of polyvinyl alcohol by near-infrared spectroscopy
A method based on near-infrared spectroscopy was developed to determine the alcoholysis degree of polyvinyl alcohol(PVA).Firstly,nuclear magnetic resonance was used to test the alcoholysis degree of 37 PVA samples.29 PVA samples were selected as the calibration sample set and their near-infrared spectra were subsequently processed by second derivatives and stand-ard normal variate transformations in appropriate wavelength ranges and optimal principal factor numbers;and a quantitative anal-ysis model was established using partial least squares(PLS)and the model performance was evaluated by leave-one-out cross validation method.The remaining 8 PVA samples were used as validation sample sets to compare the differences in alcoholysis degree obtained by nuclear magnetic resonance and near-infrared spectroscopy.The results showed that the PVA alcoholysis de-gree testing method based on near-infrared spectroscopy had low modeling sample size,simple operation,high experimental effi-ciency,a wide detection range of alcoholysis degree(72％-99％),high accuracy,a maximum relative deviation of only 0.56％and it also exhibited high precision,with a maximum relative standard deviation of only 0.07％,which can well meet the devel-opment and quality control requirements of high-end PVA products,so it would have promising application prospects.
polyvinyl alcoholdegree of alcoholysisnear-infrared spectroscopyquantitative analysis model
万方数据
维普
