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Organic polymer-silica nanocomposite material and its preparation method

A nano-composite material and organic polymer technology, applied in the field of materials, can solve the problems of many reaction steps, cumbersome operations, complicated processes, etc., and achieve the effect of good dispersibility

Inactive Publication Date: 2013-04-10
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is complicated and has many reaction steps, and it is difficult to determine and control the density of the surface-modified polymer chains; and the obtained silica nanomaterials have a single shape, and most of them get spherical shapes.
At the same time, the cumbersome operation and uncontrollable grafting of the above two methods, as well as the limitations of environmental pollution caused by the extensive use of organic solvents, limit the large-scale preparation of multifunctional silica nanomaterials. , various complex and cumbersome processing methods have also brought great limitations and challenges to material processing

Method used

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  • Organic polymer-silica nanocomposite material and its preparation method
  • Organic polymer-silica nanocomposite material and its preparation method
  • Organic polymer-silica nanocomposite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1, the preparation of the silica composite material with hydrophilic polyethylene glycol (PEG) on the surface

[0054] 10mL concentration is 10mg / mL block copolymer shown in formula I polyethylene glycol-polylysine (PEG 45 -b-PLL 100 ) (wherein, R is -H, m is 45, n is 100) and 2 mL of sodium phosphate buffer solution with a concentration of 0.1 M and a pH value of 7.5 are mixed, and 12 mL of the mixture is taken, and 5 mL of the obtained solution is added to it Silicic acid oligomer (the silicic acid oligomer is obtained by mixing 1.5mL of TMOS and 8.5mL of dilute hydrochloric acid with a concentration of 1mM for 5 minutes until uniform) and mix well, and react at 25°C for 2 minutes to obtain a white The turbid liquid is freeze-dried to remove moisture to obtain the silicon dioxide composite material provided by the invention with hydrophilic polyethylene glycol (PEG) on the surface.

[0055] The composite material is composed of polylysine block copolymer ...

Embodiment 2

[0057] Example 2, Preparation of silica composite material with hydrophilic and temperature-responsive poly-N-isopropylacrylamide (PNIPAM) molecular chains on the surface

[0058] 10mL concentration is 10mg / mL poly-N-isopropylacrylamide-polylysine (PNIPAM) shown in formula II 35 -b-PLL 100 ) (wherein R is -NHCH(CH 3 ) 2 , m is 35, n is 100) aqueous solution and 2mL concentration is 0.1M, after the sodium phosphate buffer solution that pH value is 7.5 is mixed, take 12mL of this mixed solution, then add 5mL gained silicic acid oligomer (the The silicic acid oligomer is obtained by mixing 1.5mL of TMOS and 8.5mL of dilute hydrochloric acid with a concentration of 1mM for 5 minutes until homogeneous), and mixing well, and reacting at 25°C for 2 minutes to obtain a white turbid liquid, freeze-dried, and removed Water is removed to obtain the silicon dioxide nanosheet composite material with hydrophilic and temperature-responsive poly-N-isopropylacrylamide (PNIPAM) molecular cha...

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Abstract

The invention discloses an organic polymer-silica nanocomposite material and its preparation method. The composite material provided by the invention is made from silica and polylysine block copolymer.The method provided by the invention is simple and easy to operate, is suitable for large scale production, and can be adopted to regulate and control the shape, dimension, surface hydrophility, solvent repeatability dispersion and stability of the silica nanocomposite material. As the surface of the silica composite material modifies polymer chain of different properties, the silica composite material has good dispersibility and emulsifying property in different high-molecular material systems and different polar solvent systems. And the anisotropy silica sheet-shape composite material can realize different orientations at phase interface of different materials. Therefore, the reinforcement and toughening of the material can be modified. The preparation method provided by the invention can be used in the fields of material modification, composite material reinforcement and toughening, drug carrier and compound separation and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to an organic polymer / silicon dioxide nanocomposite material and a preparation method thereof. Background technique [0002] Due to the small size of nanoparticles, large specific surface area, and the resulting quantum effects and surface effects, nanocomposites have better physical and mechanical properties than conventional composite materials. , Catalytic and biological aspects show its unique performance. Therefore, the preparation of nanocomposites has become one of the important methods to obtain high performance composite materials. [0003] However, when the material is at the nanometer scale, the surface atoms of the nanoparticles have extremely high surface activity, and are prone to agglomeration to form larger nanoparticle aggregates. Therefore, how to uniformly disperse inorganic materials at the nanoscale has become an urgent problem to be solved in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/04C08L87/00C08G69/40C08G69/48C08G81/02C08L101/00
Inventor 李志波夏琳雒春辉
Owner INST OF CHEM CHINESE ACAD OF SCI
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