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Method for measuring intrinsic viscosity of polymer

A technology of intrinsic viscosity and determination method, applied in the direction of DC flow characteristic measurement, flow characteristic, measurement device, etc., can solve the problems of cumbersome and difficult determination of absolute viscosity of liquid, and achieve high measurement accuracy, reduced measurement cost, and measurement efficiency. high effect

Inactive Publication Date: 2012-05-16
袁俊海
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Problems solved by technology

[0018] Difficult and tedious determination of absolute viscosity of liquids

Method used

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  • Method for measuring intrinsic viscosity of polymer
  • Method for measuring intrinsic viscosity of polymer
  • Method for measuring intrinsic viscosity of polymer

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Embodiment

[0039] The assay method of polymer intrinsic viscosity that the present invention relates to may further comprise the steps:

[0040] (a) Prepare a NaCl solution with a concentration of 1.00mol / L and place it in a constant temperature water bath at 30°C for standby; prepare a polymer solution with a solvent of 1.00mol / L NaCl and a concentration of 0.001g / mL;

[0041] (b) Use a pipette to pipette 10-15mL NaCl solution with a concentration of 1.00mol / L, add it to the Ubbelohde viscometer, keep the temperature in a water bath at 30±0.05°C for 10min, and measure the time it flows through the lines a and b , measure three times, and the time difference between each time should not exceed 0.3 seconds, and calculate the average value of the solvent flow time t 0 ;

[0042] (c) Clean the viscometer, after drying, pipette 10mL concentration of C 0 = 0.001g / mL polymer solution, put it into the Ubbelohde viscometer, keep the temperature in a water bath at 30±0.05°C for 10 minutes, meas...

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Abstract

The invention discloses a method for measuring intrinsic viscosity of a polymer. The method for measuring the intrinsic viscosity of the polymer comprises the following steps of: preparing a polymer solution and calculating an average value t0 of solvent flowing time; calculating an average value t1 of polymer solution flowing time; calculating an average value t2 of the polymer solution flowing time; measuring the flowing time t3, t4 and t5 of the polymer solution at the concentration of 1 / 2C0, 1 / 3C0 and 1 / 4C0 respectively; and calculating an intercept on a longitudinal coordinate, and calculating the intrinsic viscosity of the polymer according to an intrinsic viscosity calculation formula. By the method, the intrinsic viscosity of the polymer can be measured effectively; and the method is high in measuring precision and high in measuring efficiency, and the measuring cost of the intrinsic viscosity of the polymer is reduced.

Description

technical field [0001] The invention relates to a method for measuring the intrinsic viscosity of polymers. Background technique [0002] When a polymer is dissolved in a solvent to form a solution, the viscosity of the solution is often greater than that of the solvent water, and the intrinsic viscosity [η] is usually used to represent the contribution of polymer molecules to the solution viscosity. The definition of intrinsic viscosity [η] is the reduced viscosity when the concentration of the polymer solution approaches zero, that is, the contribution of a single molecule to the solution viscosity, and the viscosity value reflecting the properties of the polymer does not change with the concentration, and its expression is : [0003] [ η ] = lim C → 0 η sp C [0004] in: [00...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01N11/06
Inventor 袁俊海
Owner 袁俊海
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