A method for preparing polymer nanowires with controllable molecular orientation

Abstract

The invention provides a method for preparing a polymer nanowire with a controllable molecular orientation, which comprises the following steps: preparing a nanoporous alumina template; melting and pressing the polymer into a polymer film with a thickness of about 10-200 microns; The polymer film is placed under the nanoporous alumina template, and the two are in close contact. In a vacuum environment, heat to 30-50°C above the melting point of the polymer, and keep it for more than 24 hours, so that it is sucked into the porous oxide film. then cooled to 40-110°C below the melting point of the polymer for more than 10 hours; then cooled to room temperature; removed excess material on the surface of the template; immersed the polymer-containing nanoporous alumina template into hydrogen peroxide In the potassium solution, after the template material is dissolved, the oriented polymer nanowires are obtained. The orientation of the polymer molecular chains obtained by adopting the technical solution of the present invention is controllable, and the molecular orientation of the obtained polymer nanowires is uniform.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing polymer nanowires with controllable molecular orientation. Background technique [0002] The molecular chain orientation of polymers can be regulated by the restricted growth of polymers in different dimensions at the nanoscale. Polymer growth in thin films is considered one-dimensionally confined; polymer growth in nanocylindrical pores is defined as two-dimensionally confined; and polymer growth in spherical particles is defined as three-dimensionally confined. In one-dimensional confinement (thin film growth), block copolymers will produce microscopic phase separation in the film, and the morphology and structure of the microscopic phase are affected by the film thickness. Chemical modification of the film substrate surface and control of the film thickness can tune the microscopic phase morphology and structure. [0003] In the two-dimen...

AI Technical Summary

Problems solved by technology

In the three-dimensional confinement of polymers, the orientation of molecular chains has not been explained clearly so far.

[0005] At present, the existing technology uses electrospinning to prepare polymers to make one-dimensional nanofibers, but the molecular orientation is not perfect, and there are many defects in the molecular chain arrangement, which affects the actual use.

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