Modification of nano-alumina

The "modified" of nano-alumina:

1. Surface physical modification

(1) Adsorption

(2) Coating

(3) Irradiation treatment

(4) Other methods. In fact, there are many physical modification methods that can be used in nano-powder dispersion, such as surface deposition, surface electroless plating, etc., which often form alumina-based composite materials, which improve the dispersibility of nanoparticles and also cover up to a certain extent. the properties of nanoparticles.

2. Chemical modification method

Some hydroxyl groups and residual charges remain on the surface of nano-alumina. Using this property, the modifier can be selected to carry out chemical reaction, and the structure and state of the surface of alumina can be changed to achieve the purpose of surface modification. The common methods of chemical modification of nano-alumina surface are as follows:

(1) coupling agent method;

(2) grafting method;

(3) grafting-coating method.

The research of nano-Al2O3 is one of the hotspots in the current research field, and it has a very broad application field in the modification of polymers. The addition of nano-Al2O3 can greatly improve the mechanical properties, surface properties, electrical properties and thermal properties of the polymer, but nano-Al2O3 is easy to agglomerate and has poor compatibility with polymers, which greatly limits its use in modified polymerization. Therefore, before realizing the efficient modification of polymers by nano-alumina, it is first necessary to modify and improve itself.