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Hybrid material with UV (Ultraviolet)-light induced gradient structure, preparation method and application of hybrid material in aspect of responsive shape transformation

A technology of gradient structure and hybrid materials, which is applied in the application fields of ultraviolet light-induced gradient structure hybrid materials, preparation, and responsive shape transformation. Issues such as promotion and use in a wide range to achieve a highly controllable effect

Active Publication Date: 2018-07-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method often requires a complex synthesis process and specific liquid crystal orientation conditions, and the complex process conditions are harsh, so it is not conducive to large-scale promotion and use.

Method used

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  • Hybrid material with UV (Ultraviolet)-light induced gradient structure, preparation method and application of hybrid material in aspect of responsive shape transformation
  • Hybrid material with UV (Ultraviolet)-light induced gradient structure, preparation method and application of hybrid material in aspect of responsive shape transformation
  • Hybrid material with UV (Ultraviolet)-light induced gradient structure, preparation method and application of hybrid material in aspect of responsive shape transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] SBS and mercaptopropionic acid were dissolved in toluene in different proportions, and an appropriate amount of photoinitiator I907 was added. In this example, the proportion was set to 20%. After stirring, the click reaction was performed under ultraviolet light. figure 1 Is the reaction process equation.

[0041] Dissolve carboxyl grafted SBS in toluene and add anthracene epoxy compound Reacted at 80°C for 48 hours to obtain anthracene grafted SBS. The grafting amount of anthracene in this embodiment is 50% of the carboxyl group. figure 2 It is the SBS reaction equation of anthracene grafting. image 3 It is the nuclear magnetic spectrum of carboxyl grafted SBS and anthracene grafted SBS in Example 1.

Embodiment 2

[0043] The SBS grafted with anthracene and carbon nanotubes (1%, 2%, 3%, 4%, 5%) in toluene were mixed uniformly in toluene and heated at 0°C. Remove the solvent to form a film. Figure 4 It is the stress-strain curve of hybrid materials with different carbon nanotube content. As the content of carbon nanotubes increases, the breaking strength and modulus of the material increase, and the breaking elongation decreases. In this system, several composite materials with carbon nanotube content have good elasticity. In order to balance the elasticity and strength properties, we select the composite material with carbon nanotube content of 2% as a representative to study its responsive deformation, but This performance is not limited to this content of composite materials.

Embodiment 3

[0045] A hybrid material with an ultraviolet light-induced gradient structure prepared by grafting a photosensitive group with an elastomer material and a carbon nanomaterial (the sample containing 2% of carbon nanotubes prepared in Example 2) was pre-stretched under heating at 80°C , Make the stretch rate be 100%, 200% and 300% respectively, and then lower to room temperature; treat with 365nm wavelength ultraviolet light for 10 minutes, then heat at 100°C for 20 minutes. The shape of the membrane changes, such as Figure 5 Shown.

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Abstract

The invention discloses a hybrid material with a UV (Ultraviolet)-light induced gradient structure, a preparation method and application of the hybrid material in aspect of responsive shape transformation. The hybrid material is a membrane material formed by compounding a photosensitive group grafted elastomer material and a carbon nanomaterial, wherein a photosensitive group is a group capable ofgenerating photo-dimerization reaction, and a matrix of the elastomer material is an elastomer containing isolated double bonds. According to the hybrid material disclosed by the invention, the lightintensity of different depths of the inner part of a material can be regulated during photo-crosslinking by utilizing the characteristic of light absorption of the carbon nanomaterial, and a dimerization rate of photo-dimerization groups in different depths and the crosslinking density of the material can be realized, so that the membrane material has a gradient structure in a vertical direction,and transformation of various shapes of the membrane material can be realized under a condition of external stimulation (such as temperature, a solvent and infrared light) due to formation of the gradient structure; meanwhile, a photo-induced gradient structure is reversible and can be wiped through heating or UV radiation 300nm or less, and an original linear structure can be recovered.

Description

Technical field [0001] The invention belongs to the technical field of chemical material preparation and application, and specifically relates to a hybrid material with an ultraviolet light-induced gradient structure, a preparation method and its application in responsive shape transformation. Background technique [0002] At present, the responsive shape transformation of materials is a hot research direction, and the unbalanced structure materials show great advantages in the research of responsive shape transformation. The existence of unbalanced structure allows it to undergo more diverse and designable shape changes according to regulation when responsive behavior occurs. However, in the current research, the preparation of such unbalanced structural materials is mostly concentrated in two main methods: layer structure and liquid crystal polymer. In the process of preparing the layered structure, two different polymers need to be selected and bonded together to form a two-l...

Claims

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Application Information

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IPC IPC(8): C08L53/02C08K7/24C08F8/14C08F8/00C08F297/04C08J5/18
CPCC08F8/00C08F8/14C08J5/18C08J2353/02C08K7/24C08K2201/011C08F297/04
Inventor 白静史子兴
Owner SHANGHAI JIAO TONG UNIV
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