A method for real-time in situ quantitative determination of solution quality and its viscoelasticity in polymer films

Abstract

The invention relates to a method for measuring the mass of a solution in a thin polymer film and the viscoelasticity of the thin polymer film. The method comprises the steps that (1) in a quartz crystal microbalance, frequency and dissipation change values of a standard chip caused by a solution and frequency and dissipation change values of a standard chip covered by the thin polymer film caused by the solution are recorded in real time, and are subtracted to obtain the frequency and dissipation change values of the solution in the thin polymer film; (2) a product of a frequency multiplying number and the dissipation change value of the solution in the thin polymer film is taken as an X-coordinate, and the ratio of the frequency change value of the solution in the thin polymer film to the frequency multiplying number is taken as a Y-coordinate to make a linear regression equation, so that the intercept of the linear regression equation on a Y-axis is the mass of the solution in the thin polymer film, and the slope of the linear regression equation is the retardation time of the thin polymer film. The method can be used for measuring the mass of the solution in the thin film and the viscoelasticity of the thin film in real time simply and accurately in a liquid environment. The method is particularly suitable for measuring a high-viscoelasticity polyelectrolyte brush brought by highly hydrated swelling.

Description

technical field

[0001] The invention belongs to the field of measurement, and in particular relates to a method for real-time in-situ quantitative determination of the solution quality and viscoelasticity in a polymer film. Background technique

[0002] Polymers are widely used in production and life, especially the polymers on the solid-liquid surface interface, which has greatly attracted people's research interest. Such as the amphiphilicity of polymer additives in oil extraction, the lubricating effect of polymers at artificial joints, the anti-coagulation effect of polymers at colloidal interfaces, etc. Therefore, it is very important to accurately and quantitatively characterize the solution content at the solid-liquid interface.

[0003] Dissipative quartz crystal microbalance (Quartz Crystal Microbalance, QCM-D) is a new technology for measuring surface and interface quality and viscoelastic changes, with 10 -9 G-level sensitivity and real-time monitoring features....

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