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Method for Constructing Morphologically Controllable Stripe Microstructures on the Surface of Elastomer PDMS

A striped, micro-structured technology, applied in the direction of coating, etc., can solve the problems of cumbersome operation process, difficult demoulding, incomplete micro-pattern transfer, etc., and achieve the effect of low cost and simple operation

Active Publication Date: 2019-03-05
DALIAN OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method does not change the chemical structure of the material surface, there are still problems such as cumbersome operation process, difficult demoulding, and incomplete transfer of micropatterns.

Method used

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  • Method for Constructing Morphologically Controllable Stripe Microstructures on the Surface of Elastomer PDMS
  • Method for Constructing Morphologically Controllable Stripe Microstructures on the Surface of Elastomer PDMS

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] a. Mix and stir the PDMS prepolymer and the cross-linking agent at a mass ratio of 9:1 for 20 minutes to obtain PDMS prepolymer solution A, pour PDMS prepolymer solution A into the mold, vacuum degass for 2 hours, and then place it at 50 Cure at ℃ for 10 hours to obtain a 2 mm thick PDMS film; take the PDMS prepolymer and crosslinking agent at a mass ratio of 15:1 and mix and stir for 20 minutes to obtain PDMS prepolymer solution B, and spin PDMS prepolymer solution B to Coated on the PDMS film to form a PDMS ultra-thin film with a thickness of about 0.1 micron, and obtain a PDMS composite double-layer structure;

[0012] b. Perform uniaxial stretching on the obtained PDMS composite bilayer structure with a stretching ratio of 35% ((length after stretching-length before stretching) / length before stretching), cure at 50°C for 3.5 hours, and then Release the stress at a rate of 5mm / min until the stress is zero (return to the initial state).

[0013] The optical microscop...

Embodiment 2

[0015] a. Mix and stir the PDMS prepolymer and cross-linking agent at a mass ratio of 25:1 for 20 minutes to obtain PDMS prepolymer solution A, pour PDMS prepolymer solution A into the mold, vacuum degass for 2 hours, and then set it at 70 Cure at ℃ for 5 hours to obtain a 5 mm thick PDMS film; take the PDMS prepolymer and cross-linking agent at a mass ratio of 15:1 and mix and stir for 20 minutes to obtain PDMS prepolymer solution B. Spin PDMS prepolymer solution B to Coated on the PDMS film to form a PDMS ultra-thin film with a thickness of about 1 micron, and obtain a PDMS composite double-layer structure;

[0016] b. Perform uniaxial stretching on the obtained PDMS composite bilayer structure with a stretching ratio of 60% ((length after stretching-length before stretching) / length before stretching), cure at 70°C for 2.5 hours, and then Release the stress at a rate of 5 mm / min until the stress is zero (return to the initial state).

[0017] The optical microscope pictures...

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Abstract

The invention discloses a method for constructing a shape-controllable strip-shaped micro structure on the surface of elastomer PDMS (polydimethylsiloxane). The method comprises the steps of mixing and stirring PDMS prepolymers with a cross linking agent for 15 to 30 minutes to obtain a PDMS prepolymer solution A, pouring the PDMS prepolymer solution A into a mold, and after carrying out vacuum degassing for 1 to 2 hours, carrying out curing for 5 to 10 hours at the temperature of 50 to 70 DEG C to obtain a PDMS thin film with the thickness of 2 to 5 mm; mixing and stirring PDMS prepolymers with the cross linking agent for 15 to 30 minutes to obtain a PDMS prepolymer solution B, smearing the PDMS prepolymer solution B on the PDMS thin film through spinning to form a PDMS ultrathin film with the thickness of 0.1 to 1 micrometer, and obtaining a PDMS composite double-layer structure, wherein the mass ratios of the prepolymers to the cross linking agent in the PDMS prepolymer solution A and the PDMS prepolymer solution B are respectively (9 to 15) to 1 and (15 to 25) to 1 or (15 to 25) to 1 and (9 to 15) to 1; and carrying out uniaxial drawing on the obtained PDMS composite double-layer structure at the drawing ratio of 35 to 60%, carrying out curing for 2.5 to 3.5 hours at the temperature of 50 to 70 DEG C, and releasing stress at the speed of 5 mm / min till the stress is zero.

Description

technical field [0001] The invention relates to a processing method of polymer microstructure, especially a method for constructing a controllable morphology on the surface of elastomer PDMS (polymethylsiloxane) without changing the chemical structure of the elastomer surface, simple operation and low cost. A method for stripe-like microstructures. Background technique [0002] At present, surface microstructures have been widely used in optics, microelectronics, sensors, biomedicine and other fields. There are two common and simple methods for non-etching to achieve surface microstructure: one is based on the soft-hard composite double-layer structure system (the lower layer is a thicker soft elastic substrate, and the upper layer is a thinner hard film). When stretching and releasing to return to the initial state, due to the difference in elastic modulus between the soft and hard layers, stress will be generated at the interface, and the surface will release the stress i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C69/02B29C41/04B29C41/20B29C41/22B29C55/04
CPCB29C41/04B29C41/20B29C41/22B29C55/04B29C69/02
Inventor 汪静潘超曲冰迟建卫
Owner DALIAN OCEAN UNIV