Method for detecting alcoholysis degree distribution of polyvinyl alcohol
A polyvinyl alcohol and detection method technology, applied in the direction of measuring device, material separation, analysis of materials, etc., can solve problems such as inability to reflect, and achieves favorable for refined application, strong operability, and accurate detection of alcoholysis degree distribution. Effect
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Embodiment 1
[0024] Prepare an aqueous solution of polyvinyl alcohol (specification 17-88) at a concentration of 0.1% (wt), heat and dissolve at 90° C. for 2 hours, and cool to normal temperature. Gel chromatograph sample injection 100 μ L, 1% (wt) sodium nitrate aqueous solution is mobile phase, setting t=20 seconds, couplet with infrared spectrometer, record alcoholysis degree data as follows figure 1 shown.
[0025] After calculation, the arithmetic mean of the degree of alcoholysis is 87.88%, and the standard deviation is 1.66. The degree of alcoholysis detected by comparative chemical analysis method was 89.1%, with an error of 1.37%.
Embodiment 2
[0027] Prepare a 0.1% (wt) aqueous solution of polyvinyl alcohol (specification 17-92), heat and dissolve at 90° C. for 2 hours, and cool to normal temperature. Gel chromatograph sample injection 100 μ L, 1% (wt) sodium nitrate aqueous solution is mobile phase, setting t=20 seconds, couplet with infrared spectrometer, record alcoholysis degree data as follows figure 2 shown.
[0028] After calculation, the arithmetic mean of the degree of alcoholysis is 93.10%, and the standard deviation is 1.57. The degree of alcoholysis detected by comparative chemical analysis is 92.35%, with an error of 0.81%.
Embodiment 3
[0030] Prepare an aqueous solution of polyvinyl alcohol (specification 26-99) at a concentration of 0.1% (wt), heat and dissolve at 90° C. for 2 hours, and cool to normal temperature. Gel chromatograph sample injection 100 μ L, 1% (wt) sodium nitrate aqueous solution is mobile phase, setting t=20 seconds, couplet with infrared spectrometer, record alcoholysis degree data as follows image 3 shown.
[0031] After calculation, the arithmetic mean of the degree of alcoholysis is 99.23%, and the standard deviation is 0.58. The degree of alcoholysis detected by the comparative chemical analysis method is 99.67%, with an error of 0.44%.
PUM
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