Measurement method of intrinsic viscosity of polyacrylonitrile-based polymer solutions and protofilaments

A polyacrylonitrile-based, fiber-specific technology, applied in the field of polymers, can solve the problems of difficult measurement of intrinsic viscosity of various polymers, narrow measurement range, poor applicability, etc., to achieve accurate and controllable testing process, good applicability, comparable effect

Inactive Publication Date: 2017-11-28
兰州蓝星纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Different polymers have different molecular chain lengths and different molecular weight distributions. The above method has a narrow measurement range and poor applicability. It is difficult to measure the intrinsic viscosity of various polymers and has poor practical applicability.

Method used

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  • Measurement method of intrinsic viscosity of polyacrylonitrile-based polymer solutions and protofilaments
  • Measurement method of intrinsic viscosity of polyacrylonitrile-based polymer solutions and protofilaments
  • Measurement method of intrinsic viscosity of polyacrylonitrile-based polymer solutions and protofilaments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Required reagents and materials

[0048] NaSCN; chromatographically pure DMF; formic acid;

[0049] Required equipment

[0050] SCHOTT 532 10 / I Ubbelohde capillary viscometer;

[0051] SCHOTT Viscometer;

[0052] (G 4 funnel);

[0053] operation process

[0054] The polymer is hydraulically formed into a thin film, transferred to formic acid with a temperature of 40-80°C and a mass fraction of 5% for 30 minutes, and then transferred to desalted water at a temperature of 40-80°C for 3 times, 30 minutes each time, to remove Solvent; then place the polymer film in an oven at 80-110°C to dry it completely (the oil should be removed before the original silk fiber test).

[0055] A series of polymer solutions with different concentrations were prepared by using 0.1000M sodium thiocyanate DMF as solvent. After the sample is completely dissolved, use G 4 The prepared polymer solution was filtered through a funnel, and the filtrate was transferred to an Ubbelohde viscosi...

Embodiment 2

[0067] Required reagents, materials, instruments and equipment are the same as in Example 1; the operating steps are the same as in Example 1.

[0068] Table 4 Intrinsic viscosity data of the same sample measured at different times

[0069] Measurement date

[0070] It can be seen from Table 4 that the standard deviation of the sample is 0.0063 for the same polymerization liquid sample produced by Lanzhou Bluestar Fiber at different times and measured by different analysts, indicating that the results are accurate and reliable.

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Abstract

The invention discloses a measurement method of intrinsic viscosity of polyacrylonitrile-based polymer solutions and protofilaments. The method comprises steps as follows: 1) polymer solutions with different concentrations are prepared, and the specific viscosity eta sp of the solutions is measured; 2) values of equation parameters kappa and beta are obtained according to formulas (1) and (2) in the specifications; 3) the specific viscosity of to-be-measured polymer solutions is measured, the intrinsic viscosity of the polymer solutions is calculated according to a formula (3) in the specification. The measurement process is accurate and controllable, requirements are standard, obtained parallel results are accurate and reliable, the comparability is high, and the application property is better.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a method for measuring the intrinsic viscosity of a polyacrylonitrile-based polymer liquid and a precursor fiber. Background technique [0002] Intrinsic viscosity is an important index to characterize the molecular chain length, molecular weight and molecular weight distribution of linear polymers, and can directly reflect the properties of polymer materials. Therefore, the determination of intrinsic viscosity has practical guiding significance for timely adjustment of production process. [0003] There are many methods for measuring the intrinsic viscosity of polyacrylonitrile-based polymers. For example, the research department of Coventry's group uses DMF as a solvent to prepare a solution with a polymer concentration of 0.5%, and uses a "U"-shaped viscosity tube to measure the relative viscosity (η r ) and calculate the intrinsic viscosity according to known related...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01N1/34
CPCG01N1/34G01N11/00
Inventor 王斐赵红霞
Owner 兰州蓝星纤维有限公司
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