Polyether sulfone temperature stimulus response film and preparation method thereof

Abstract

The invention belongs to the field of temperature stimulus response films, and provides a method for preparing a polyether sulfone temperature stimulus response film. The method comprises the following steps: (1) adding poly(N-isopropylacrylamide) nano-gel dry powder into N-methylpyrolidone, uniformly mixing, adding polyether sulfone, uniformly mixing to form a film casting liquid, and degassing the film casting liquid; (2) pouring the degassed film casting liquid onto a film casting panel, preparing a continuous uniform liquid film from the film casting liquid by using a film blade, standing the liquid film-loaded film casting panel for at least 20 minutes at a temperature of 20-30 DEG C and relative humidity of 60-80 percent, putting the film-loaded film casting panel into water at room temperature, soaking until the liquid film is completely solidified, washing the solidified film to remove N-methylpyrolidone, and drying the film in which micropores are uniformly distributed along the thickness direction of the film, thus obtaining the polyether sulfone temperature stimulus response film. The method is capable of promoting the film flux, temperature response capability and mechanical performance of the polyether sulfone temperature stimulus response film, the process is simple, and industrial production can be realized easily.

Description

technical field [0001] The invention belongs to the field of temperature-stimulus-responsive membranes, in particular to a polyethersulfone temperature-stimulus-responsive membrane and a preparation method thereof. Background technique [0002] The permeability of temperature-stimuli-responsive membranes can be self-regulated in response to external temperature changes. This type of membrane has great potential application value in the fields of controlled release systems, separation processes, and switching valves. The existing methods for preparing temperature-stimuli-responsive membranes mainly include: (1) preparing block polymers of membrane substrate materials and temperature-sensitive materials, and then forming membranes by immersion-induced phase separation (Liquid-induced phase separation, referred to as LIPS) , the mechanical properties of the film prepared by this method are not good. With the increase of the content of temperature-sensitive substances in the fil...

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Problems solved by technology

Due to the simple operation of this method, it has the prospect of industrial scale-up. However, the polyethersulfone temperature-stimuli-responsive membrane prepared by this method is an asymmetric membrane with a large number of finger-shaped holes on one side of the finger-shaped holes with a very thin skin. (See figure 1 ), the membrane with this structure has the following disadvantages: ①Because the side of the membrane with finger-shaped holes is a discontinuous structure, only the very thin cortex on the side of the finger-shaped holes in the membrane is a continuous structure, which leads to mechanical defects in the membrane , its mechanical properties are not good; ②Due to the excessively large and discontinuous pores of the finger-shaped holes, the entire membrane mainly relies on the thin skin layer on the side of the finger-shaped holes to intercept substances during use, and only the particles distributed in the The temperature-sensitive substances in the above-mentioned cortex will affect the membrane flux after responding to temperature stimulation, but the cortex is very thin, and the temperature-sensitive substances that can be accommodated in it are also very limited, resulting in a weak temperature response ability of the membrane; As the content of temperature-sensitive substances increases, the number of micropores in the cortex on the side of the finger-shaped pores increases, and the membrane flux increases significantly, but the increase in the content of temperature-sensitive substances brings the effect of increasing the ability to control high and low temperature membrane flux It is less than the effect of increasing the flux itself, resulting in a smaller difference in the change of high and low temperature flux, that is, the temperature response capability of the membrane is weakened

The above disadvantages severely limit the application of the membranes prepared by this method

In addition, this method coagulates the liquid film in a coagulation bath at 5°C. Due to the low temperature of the coagulation bath, the energy consumption in industrial production is too high, and there is a problem of high production cost.

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