A kind of molecular weight or molecular weight distribution detection method of basic polymer
A technology of molecular weight distribution and detection method, applied in the field of polymer material detection, can solve the problem of unstable molecular weight of samples
Active Publication Date: 2019-10-01
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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Problems solved by technology
In order to solve the problem that the small molecular part of the basic polymer in the detection of the molecular weight and molecular weight distribution in the prior art may be washed off during the washing process, and the molecular weight of the treated sample is unstable, the application discloses a more accurate , Molecular weight or molecular weight distribution detection method of basic polymer with higher stability
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The invention relates to the technical field of detection of high polymer materials and in particular relates to a method for detecting molecular weight or molecular weight distribution of an alkaline polymer. The method comprises the following steps: preparing an acetic acid-methanol solution, adding the acetic acid-methanol solution into an alkaline polymer sample, dissolving, adding tetrahydrofuran, dissolving, uniformly shaking, filtering and performing sample injection. According to the technical scheme disclosed by the invention, the sample for detection is pretreated, so that the alkaline polymer can be completely dissolved to be used for subsequent detection. Moreover, the sample pretreatment method does not produce any great negative effect on the stability of the sample and the accuracy of the detection result, and a technical base is provided for detection of the alkaline polymer.
Description
technical field The invention relates to the technical field of polymer material detection, in particular to a method for detecting molecular weight or molecular weight distribution of basic polymers. Background technique In the field of polymer material detection technology, the molecular weight distribution is usually measured by gel permeation chromatography, ultraviolet detector, differential refractive index detector, organic chromatographic column, etc., and the molecular weight distribution is qualitatively determined from the change of the peak. Chromatographic detection. In these detection methods, the sample is usually dissolved in tetrahydrofuran first, so that the concentration of the injection solution is between 0.1 mg / ml and 5 mg / ml. However, there are many polymers with obvious acidity and alkalinity, which makes these polymers with obvious acidity and alkalinity not well soluble in tetrahydrofuran, resulting in inaccurate or incomplete detection. In the p...
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IPC IPC(8): G01N30/02G01N30/06
Inventor 张金柱彭国宝田燃燃
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD