Method for determining contents of 1,2-diol connection structures in polyvinyl alcohol

A technology of polyvinyl alcohol and polyvinyl alcohol solution, applied in measuring devices, chemical method analysis, chemical analysis by titration, etc., can solve the problems of complex instruments and operating techniques for viscosity measurement, and achieve stable data and simple operation Effect

Inactive Publication Date: 2019-02-15
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the viscosity measurement in this method requ

Method used

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  • Method for determining contents of 1,2-diol connection structures in polyvinyl alcohol
  • Method for determining contents of 1,2-diol connection structures in polyvinyl alcohol
  • Method for determining contents of 1,2-diol connection structures in polyvinyl alcohol

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Embodiment 1

[0034] In this embodiment, the raw material to be tested—polyvinyl alcohol with a purity of 95% (polymerization degree of 1700 and degree of alcoholysis of 99%) is used to verify the accuracy of the method of the present invention. , the specific steps are as follows:

[0035] (1) Weigh A g of polyvinyl alcohol to be tested and add it to a conical beaker, then add 100mL of deionized water, heat up to 90°C, stir until completely dissolved, and then cool to room temperature to obtain a polyvinyl alcohol solution, wherein, A is respectively 0.546g (recorded as test 1), 0.5589g (recorded as test 2), 0.5816g (recorded as test 3).

[0036] (2) Add 3 mL of 0.1000 mol / L dilute hydrochloric acid and C g sodium periodate (purity E is 99.5%) to the polyvinyl alcohol solution, shake and shake well, and react for 5 minutes; after the reaction is completed, add Take 0.6g of potassium iodide, shake well, and place in the dark for 10 minutes to obtain the titration solution; corresponding to...

Embodiment 2

[0041] In this embodiment, the raw material to be tested—polyvinyl alcohol with a purity of 94.5% (degree of polymerization 500, degree of alcoholysis 98.7%) is used to verify the accuracy of the method of the present invention. , the specific steps are as follows:

[0042] (1) Weigh 0.5192g of polyvinyl alcohol to be tested and add it to a conical beaker, then add 100mL of deionized water, heat up to 90°C, stir until completely dissolved, then cool to room temperature to obtain a polyvinyl alcohol solution.

[0043] (2) Add 6mL of 0.1000mol / L dilute hydrochloric acid and 0.0767g of sodium periodate (purity: 99.5%) to the polyvinyl alcohol solution, shake it well, and react for 5 minutes; after the reaction, add 0.6 g potassium iodide, shake well, and place in the dark for 10 minutes to obtain the titration solution.

[0044] (3) titrate the solution to be titrated with a sodium thiosulfate solution with a concentration of 0.100mol / L, shake well while titrating, add 4 to 5 dr...

Embodiment 3

[0047] In this embodiment, the raw material to be tested—polyvinyl alcohol with a purity of 96% (degree of polymerization 2600, degree of alcoholysis 99.8%) is used to verify the accuracy of the method of the present invention. , the specific steps are as follows:

[0048] (1) Weigh 0.5098g of polyvinyl alcohol to be tested and add it to a conical beaker, then add 100mL of deionized water, heat up to 90°C, stir until completely dissolved, then cool to room temperature to obtain a polyvinyl alcohol solution.

[0049] (2) Add 6mL of 0.1000mol / L dilute hydrochloric acid and 0.0802g of sodium periodate (purity: 99.5%) to the polyvinyl alcohol solution, shake it well, and react for 5min; after the reaction, add 0.6 g potassium iodide, shake well, and place in the dark for 10 minutes to obtain the titration solution.

[0050] (3) titrate the solution to be titrated with a sodium thiosulfate solution with a concentration of 0.100mol / L, shake well while titrating, add 4 to 5 drops of...

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Abstract

The invention discloses a method for determining contents of 1,2-diol connection structures in polyvinyl alcohol. The method is characterized in that after a to-be-tested polyvinyl alcohol sample is dissolved in water; periodic acid is added for complete reaction; potassium iodide is added for placing in dark place for 5-15 min; and finally sodium thiosulfate solution is adopted to carry out quantitative titration under the display of a starch indicator until the solution is colorless, and a volume of consumed sodium thiosulfate solution is recorded so as to calculate a content of a 1,2-diol connection structure in the to-be-tested polyvinyl alcohol. The method for determining the contents of the 1,2-diol connection structures in polyvinyl alcohol is simple to operate and stable and correct in data, and has an important application value.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for measuring the content of chemical substances, in particular to a method for measuring the content of 1,2-diol interlocking structure in polyvinyl alcohol. Background technique [0002] Polyvinyl alcohol (PVA) is a widely used water-soluble polymer compound, which can be used in fiber, building materials, optical film materials and other industries. Liu Yinglong and others pointed out in the "Polyvinyl Alcohol Vinylon Industrial Data Booklet" that the main chain of PVA molecules contains 1,3-diol (head and tail) and 1,2-diol (head and head) structures (see formula (2)), Among them, the 1,3-diol structure is the main structure, and a small amount of 1,2-diol structure is mixed. Because the structural properties of 1,2-diol are unstable, it affects the expansion degree, hot water resistance and mechanical strength of polyvinyl alcohol, and is easily oxidized and...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/162
Inventor 项小敏王旭芳申能美张龙徐凌云黄伟夏晓松汤东春
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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