Method for stopping wrinkles from being formed on surface of azobenzene thin film by light illumination
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A kind of technology of azobenzene and thin film, which is applied in the direction of coating, etc., can solve the problems of inapplicability, achieve the effect of preventing material failure, improving the service life of materials, and wide application prospects
Inactive Publication Date: 2016-06-22
TIANJIN UNIV
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Embodiment 1
[0018] (1) After mixing the PDMS prepolymer and cross-linking agent at a mass ratio of 10:1, stir fully to form a uniform prepolymer, degas the prepolymer in a vacuum pump, pour it into a petri dish, and heat it at 80°C Heating to crosslink.
[0019] (2) The PDMS elastomer obtained by step (1) cross-linking is subjected to oxygen plasma activation treatment;
[0020] (3) Spin-coat a tetrahydrofuran solution with a mass fraction of 2wt% PAzo on the activated PDMS in step (2), heat and dry to obtain a PDMS / PAzo soft-hard composite system;
[0021] (4) Divide the PDMS / PAzo soft and hard composite system into two parts, and add 30mW / cm to one part 2 part of it is illuminated, and the other part is not. At the same time, an external stress of 0.15 MPa was applied to the entire PDMS / PAzo system, no wrinkles formed in the illuminated area, and wrinkles formed in the non-illuminated area.
Embodiment 2
[0023] (1) After mixing the PDMS prepolymer and cross-linking agent at a mass ratio of 10:1, stir fully to form a uniform prepolymer, degas the prepolymer in a vacuum pump, pour it into a petri dish, and heat it at 80°C Heating to crosslink.
[0024] (2) The PDMS elastomer obtained by step (1) cross-linking is subjected to oxygen plasma activation treatment;
[0025] (3) Spin-coat a tetrahydrofuran solution with a mass fraction of 2wt% PAzo on the activated PDMS in step (2), heat and dry to obtain a PDMS / PAzo soft-hard composite system;
[0026] (4) Divide the PDMS / PAzo soft and hard composite system into two parts, one part is added with 10mW / cm 2 part of it is illuminated, and the other part is not. At the same time, an external stress of 0.15MPa was applied to the entire PDMS / PAzo system, and wrinkles were formed in both the illuminated area and the non-illuminated area, but the wrinkle cycle in the illuminated area was smaller than that in the non-illuminated are...
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Abstract
The invention discloses a method for stopping wrinkles from being formed on the surface of an azobenzene thin film by light illumination. The formation of the wrinkles on the surface of the azobenzene thin film is stopped by the light illumination through utilizing special light-induced trans-cis isomerization characters of azobenzene. The method comprises the following steps: firstly, spin-coating a polydimethylsiloxane (PDMS) substrate subjected to oxygen plasma activation treatment with a tetrahydrofuran solution of an azobenzene polymer (PAzo), so as to form a PDMS/PAzo soft-hard composite system; drying and discharging a tetrahydrofuran solvent. Under common conditions, the wrinkles are formed by the PDMS/PAzo composite system under the action of external stress. When a stress effect is applied, the light illumination is carried out, so that the wrinkles can be effectively prevented from formation. By controlling the relative size of illumination light intensity and external stress, whether the wrinkles are formed by the PDMS/PAzo double-layered system or not can be regulated and controlled. The method is simple and convenient, and is clean and effective; the method has a wide application prospect in the aspects of preventing a material from being invalid and prolonging the service life of the material in the field of composite materials.
Description
technical field [0001] The invention relates to preventing the failure of film materials, in particular to preventing the formation of wrinkles on the surface of the azobenzene film by light. Background technique [0002] Composite materials are materials with different physical properties, which are composed of materials with new properties through physical or chemical methods. Material compounding and functionalization is a major trend in the development of modern materials science. The research depth and application breadth of composite materials as well as the speed and scale of production development have become one of the important symbols to measure the advanced level of a country's science and technology. However, due to the difference in physical properties between materials, stress accumulation usually occurs at the material interface under the action of external stress during the use of materials. When the stress exceeds a certain critical condition, it will lead...
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