From the Chinese Academy of Sciences was informed that the surface of super-parent material has both super-hydrophilic and super-oleophilic properties, is a special surface properties of the material.Recently, researchers at the Institute of Metal Research, Chinese Academy of Sciences using nano-cellulose and graphene synergies through Dip coating method to obtain a super-parent polyurethane sponge.The super-parent sponge has a zero contact angle with water and oil and can quickly adsorb water and oil in a short time.This achievement is to prepare a porous elastic material with special wettability and its Composite materials provide a new way of thinking and are expected to find applications in catalyst supports and smart polymer composites.
In recent years, the research group of polymer composites in the Institute of Metals and Titanium Alloys devoted to the research of the interaction between nanocellulose and graphene, the researchers confirmed by experiments that the nanocellulose and the two-dimensional graphene sheets have strong The adsorption is closely related to the molecular structure of cellulose and the size of nanocellulose whiskers and their surface properties.The strong adsorption between nanocellulose and two-dimensional graphene sheet improves the hydrophilicity of graphene, It can effectively promote the uniform dispersion of graphene in water.
Graphene-based porous materials can generally be obtained by chemical vapor deposition, electrochemical deposition and freeze-drying methods, etc. Researchers polyurethane sponge as a template, respectively, immersed in a small amount of nano-cellulose graphene and pure graphene aqueous dispersion, Prepared sponge superhydrophobic polyurethane sponge for all types of oil has a good adsorption capacity in the field of oil-water separation has a good application prospects.
Based on the above work, polyurethane sponge with different surface wetting properties (hydrophobic-hyperparent-hydrophobic) can be obtained by changing the process, polyurethane sponge coated with nanocellulose and graphene in turn, and the amount of nanocellulose can be adjusted. The results show that the synergistic effect of nano-cellulose whiskers and graphene to construct a special super-parent surface property of polyurethane sponge is the first time in the world that direct access to the super-parent polyurethane sponge material by dip coating is reported.