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Preparation method of polystyrene with thermo-sensitive surface

A polystyrene, temperature-sensitive technology, applied in the field of polystyrene preparation, can solve the problems of insufficient preparation conditions, etc., and achieve the effects of good surface transparency, easy operation, and simple preparation method

Inactive Publication Date: 2009-10-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, usually under vacuum, 210KV, 19mA electron beam is used to irradiate 40wt.% N-isopropylacrylamide monomer solution and polymerize it on the surface of polystyrene to form a temperature-sensitive surface layer. The preparation conditions are not simple enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of surface thermosensitive polystyrene by graft polymerization of N-isopropylacrylamide. First, 10 mg of photosensitizer benzophenone was dissolved with 3 ml of 95% ethanol, and evenly spread on the surface of a polystyrene (PS) biochemical petri dish after dissolving, and dried naturally. Add 0.43g of NIPAM monomer purified by secondary crystallization into a 25ml Erlenmeyer flask, then add 7ml of tert-butanol solvent to dissolve, and make NIPAM solution. Spread the prepared solution evenly on a PS surface dish, place it under a UV lamp at a distance of 50cm, and continue to irradiate for about 2 hours to obtain a transparent, uniform and slightly yellow gel-like film with strong hydrophilicity. After washing with a large amount of water and drying, the transparency and hydrophilicity of the film layer remain unchanged. At 40°C, the contact angle between temperature-sensitive polystyrene and water is 62°-68° (the contact angle between pure polystyrene and ...

Embodiment 2

[0016] Surface temperature-sensitive polystyrene prepared by copolymerization of N-isopropylacrylamide and styrene monomer.

[0017] The same polymerization method as in Example 1, but adopting the mode of copolymerization of two monomers N-isopropylacrylamide and styrene, the molar ratio of N-isopropylacrylamide and styrene is 3: 1, grafting The film layer on the surface of polystyrene is dry and transparent, and has good hydrophilicity. The contact angles of the temperature-sensitive polystyrene petri dishes with water were 75°-82° (40°C) and 62-70° (23°C), respectively.

Embodiment 3

[0019] Multilayer copolymerization of N-isopropylacrylamide and styrene monomer to prepare polystyrene with surface temperature sensitivity

[0020] A multilayer film was prepared by the same polymerization method as in Example 1, except that two monomers N-isopropylacrylamide and styrene with different molar ratios were copolymerized. For the film layer in direct contact with the polystyrene watch glass, the monomer molar ratio of N-isopropylacrylamide to styrene is 1:3, the middle layer is 1:1, the surface layer is 3:1, and the middle layer and An appropriate amount of photosensitizer is respectively added to the solution of the surface layer. The same as in Example 1, the inner layer was formed into a film and dried, and then, the middle layer solution and the surface layer solution were applied to the watch glass in turn, and the photoinitiated polymerization process was repeated to form a multilayer film. The contact angles of temperature-sensitive polystyrene watch glas...

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Abstract

The invention provides a preparation method of polystyrene with a thermo-sensitive surface. The method comprises the following steps of: adopting benzophenone as a photosencitizer on the surface of polystyrene, initiating N-isopropyl acrylamide monomer or N-isopropyl acrylamide monomer and styrene monomer to occur graft copolymerization reaction by ultraviolet light and preparing the polystyrene with a thermo-sensitive surface layer. The preparation method can initiate homopolymerization of N-isopropyl acrylamide or copolymerization of styrene under the ultraviolet irradiation of 300 to 395nm at room temperature, and forms a layer of thermo-sensitive film with water-washing resistance and good transparency on the surface of the polystyrene. The method is simple, convenient and fast, is easy to operate, has low cost and can maintain good surface transparency of a culture dish of the polystyrene.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a method for preparing polystyrene with surface temperature sensitivity. Background technique [0002] Poly(N-isopropylacrylamide), referred to as PNIPAM, has both a hydrophilic amide group -CONH- and a hydrophobic isopropyl group -CH(CH) on its macromolecular side chain. 3 ) 2 , the aqueous solution of linear PNIPAM and the cross-linked PNIPAM hydrogel exhibit temperature-sensitive properties, and it has a low critical solution temperature (LCST, 30-35° C.) close to physiological temperature. When the temperature is higher than this temperature, the PNIPAM molecular chain curls up and presents hydrophobicity; when the temperature is lower than the LCST, the curled PNIPAM molecular chain can be stretched rapidly again, showing hydrophilicity. The cross-linked PNIPAM hydrogel also has a low critical solution temperature at around 32°C. The swollen hydrogel shrinks above this tem...

Claims

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Application Information

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IPC IPC(8): C08F257/02C08F2/50
Inventor 李谷麦堪成肖安妮
Owner SUN YAT SEN UNIV
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