Polymer molecular weight testing device and testing method

Abstract

The invention discloses a polymer molecular weight testing device and testing method. The polymer molecular weight testing device consists of two parts: a dissolution mechanism and a testing mechanism. The dissolution mechanism includes a heat collection type constant temperature heating magnetic stirrer, an iron stand, a test tube holder, a three-necked flask, an intake pipe, an outlet pipe, a rubber tube, a nitrogen gas cylinder, and a thermometer; and the three ports of the three-necked flask are connected to the inlet pipe, the outlet pipe and the thermometer separately. The testing mechanism includes an intelligent thermostatic bath, an iron stand, test tube holders, Ubbelohde viscometers, a bubble level, and a rubber tube; and the Ubbelohde viscometers are vertically fixed in the intelligent thermostat bath through the test tube holders, and the height of a plurality of Ubbelohde viscometers are kept consistent, so as to accurately measure the time of the solution flows through the upper and lower scale lines of the measuring ball of the Ubbelohde viscometer, thereby obtaining the intrinsic viscosity of the solute, and calculating the viscosity average molecular weight of thesolute according to the Mark-Houwink equation.

Description

Technical field [0001] The invention relates to the technical field of measuring instruments, in particular to a polymer molecular weight test device and a test method. Background technique [0002] High polymer refers to the relative molecular weight of 10-10 6 The high molecular weight of the above macromolecular substances gives polymers many excellent properties, so the measurement of polymer molecular weight is particularly important. [0003] There are many methods for molecular weight testing, such as end-group titration, membrane osmotic pressure, light scattering, high-speed centrifugation, gel chromatography, etc. These methods are either cumbersome to operate, or have limited measurement intervals, or measurement equipment Expensive, many factors make these methods unable to be widely used in the detection of industrial products. The viscosity method is popular because of its convenient operation, short test cycle, and high accuracy. However, the precision viscosity met...

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Problems solved by technology

[0003] There are many methods for molecular weight testing, such as end group titration, membrane osmotic pressure method, light scattering method, high-speed centrifugation, gel chromatography, etc. These methods are either cumbersome to operate, or have limited measurement intervals, or measurement equipment Expensive, many factors prevent these methods from being widely used in the detection of industrial products

The viscosity method is popular because of its convenient operation, short test cycle, and high accuracy. However, the device for testing the molecular weight of the precise viscosity method is also very expensive, and the test cost is high. If you want to use it in the detection of industrial products It is still difficult to widely apply in the

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