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A Method for Controlling the Self-Assembly Orientation of Block Copolymers Using Mechanical Shear Force

A technology of block copolymer and mechanical shear force is applied in the field of regulating the self-assembly orientation of block copolymer by using mechanical shear force, which can solve the problems of difficulty in microstructure materials, inability to process structural materials, etc. wide effect

Active Publication Date: 2018-01-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to process microstructure materials that meet the needs, we still face these two problems: 1. It is still difficult to prepare microstructure materials with predetermined structures conveniently and controllably; 2. Traditional "top-down" and macromolecular There is a blank area in the size of the self-assembly technology, and it is impossible to process structural materials in the range of 5-50nm

Method used

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  • A Method for Controlling the Self-Assembly Orientation of Block Copolymers Using Mechanical Shear Force
  • A Method for Controlling the Self-Assembly Orientation of Block Copolymers Using Mechanical Shear Force
  • A Method for Controlling the Self-Assembly Orientation of Block Copolymers Using Mechanical Shear Force

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Embodiment 1

[0033] This embodiment is a method for regulating and controlling the self-assembly orientation of PEO-b-PMAAz block copolymers by using mechanical force, which specifically includes the following steps:

[0034] (1) Utilize chloroform as solvent, preparation mass fraction is 2% PEO-b-PMAAz (molecular weight is 31.7kg / mol, PEO volume fraction is 15%) block copolymer solution, without shear force treatment, in The atomic force microscope photo (AFM image) of the block copolymer film obtained after spin-coating at 2000rpm for 30s and vacuum annealing at 140 degrees for 2h is as follows: figure 1 shown in figure 1 The dark part is the PEO domain, and the light part is the PMMAz continuous phase. figure 1 (b) is the top view of AFM, figure 1 (a) is an AFM cross-sectional view, forming vertically arranged PEO columnar micro-domains, wherein the diameter of the PEO columnar micro-domains is about 15nm, and the center-to-center distance is 20nm;

[0035] (2) Apply a mechanical she...

Embodiment 2

[0038] This embodiment is a method for regulating and controlling the self-assembly orientation of PEO-b-PMAAz block copolymers using mechanical force, which specifically includes the following steps:

[0039] (1) Utilizing toluene as a solvent, the preparation mass fraction is 0.5% PEO-b-PMAAz (molecular weight is 20kg / mol, PEO volume fraction is 23%) block copolymer solution;

[0040](2) Apply a shear force to the block copolymer solution obtained in step (1) at a speed of 1 mL / min by using a 2 mL micro-airtight sample injector, spread a film on the water surface, and pull the film with a copper mesh;

[0041] (3) The film obtained in step (2) was annealed at 140° C. for 2 hours under vacuum conditions to cause microphase separation of the block copolymer to form columnar microdomains parallel to the substrate and arranged hexagonally. The TEM image of the thin film obtained after ruthenium dyeing is as follows image 3 As shown, the dark part is the PEO domain, and the lig...

Embodiment 3

[0043] This embodiment is a method for regulating the self-assembly orientation of polystyrene-block-polyethylene oxide (PS-b-PEO) block copolymers using mechanical shear force, which specifically includes the following steps:

[0044] (1) Utilizing toluene as a solvent, preparing a polystyrene-block-polyethylene oxide (molecular weight is 30kg / mol, wherein PEO volume fraction is 14%) block copolymer solution with a mass fraction of 2%;

[0045] (2) Apply a shear force to the block copolymer solution obtained in step (1) at a speed of 1 mL / min by using a 2 mL micro-airtight sample injector, spread a film on the water surface, and pull the film with a copper mesh;

[0046] (3) Anneal the film obtained in step (2) at room temperature in a toluene / water vapor system for 48 hours to cause microphase separation of the block copolymer to form columnar microdomains parallel to the substrate and arranged hexagonally. The TEM image of the thin film obtained after ruthenium dyeing is as...

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Abstract

The present invention relates to the technical field of functional polymer materials, in particular to a method for regulating the self-assembly orientation of amphiphilic block copolymers by using mechanical shear force, which specifically includes the following steps: (1) preparing a block copolymer solution; 2) applying mechanical shear force to the block copolymer solution, and forming a film from the block copolymer solution; (3) annealing the film obtained in step (2) at 80-160° C. for 0.5-48 h under vacuum conditions or at Solvent annealing at room temperature for 24 to 96 hours causes the block copolymer to undergo microphase separation and form columnar microdomains parallel to the substrate and arranged hexagonally. The invention regulates the orientation of the self-assembled structure of the amphiphilic block copolymer solution by applying mechanical shear force, and the orientation of the columnar micro-domain changes from the orientation perpendicular to the substrate to the self-assembled structure parallel to the substrate.

Description

technical field [0001] The invention relates to the technical field of functional polymer materials, in particular to a method for regulating the self-assembly orientation of block copolymers by using mechanical shear force. Background technique [0002] The 21st century is the information age, and optoelectronic information technology is the main feature of this era. As an indispensable and important material in optoelectronic information technology, ordered microstructure materials have become the focus of attention in today's society. In order to process microstructure materials that meet the needs, we still face these two problems: 1. It is still difficult to prepare microstructure materials with predetermined structures conveniently and controllably; 2. Traditional "top-down" and macromolecular There is a blank area in the size of the self-assembly technology, and it is impossible to process structural materials in the range of 5-50nm. Due to the incompatibility betwe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18
Inventor 陈爱华李宗博
Owner BEIHANG UNIV