A method of preparing graphene from coal can include thermally processing raw coal and, after the coal has been at least partially cooled from thermal processing, forming reduced graphene oxide from the coal.

The disclosure provides a method for removing a C4-C20 hydrophilic compound. The method for removing a hydrophilic compound includes step (a) of exposing a composition containing a C4-C20 hydrophilic compound to 0.1 to 500 kGy of radiation to remove the hydrophilic compound.

The disclosure provides a method for removing a C4-C20 hydrophilic compound. The method for removing a hydrophilic compound includes step (a) of exposing a composition containing a C4-C20 hydrophilic compound to 0.1 to 500 kGy of radiation to remove the hydrophilic compound.

A method of preparing graphene from coal can include thermally processing raw coal and, after the coal has been at least partially cooled from thermal processing, forming reduced graphene oxide from the coal.

A method of preparing graphene from coal can include thermally processing raw coal and, after the coal has been at least partially cooled from thermal processing, forming reduced graphene oxide from the coal.

The present invention relates to a super absorbent polymer which maintains excellent absorption performance and retains physical properties even after being physically damaged by an external force. The super absorbent polymer comprises: a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; and a surface cross-linked layer formed on the base polymer powder and including a second cross-linked polymer in which the first cross-linked polymer is further cross-linked via an alkylene carbonate having 2 to 5 carbon atoms, wherein the super absorbent polymer satisfies predetermined physical properties.

The present invention relates to a super absorbent polymer which maintains excellent absorption performance and retains physical properties even after being physically damaged by an external force. The super absorbent polymer comprises: a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; and a surface cross-linked layer formed on the base polymer powder and including a second cross-linked polymer in which the first cross-linked polymer is further cross-linked via an alkylene carbonate having 2 to 5 carbon atoms, wherein the super absorbent polymer satisfies predetermined physical properties.

The present invention relates to a super absorbent polymer which maintains excellent absorption performance and retains physical properties even after being physically damaged by an external force. The super absorbent polymer comprises: a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; and a surface cross-linked layer formed on the base polymer powder and including a second cross-linked polymer in which the first cross-linked polymer is further cross-linked via an alkylene carbonate having 2 to 5 carbon atoms, wherein the super absorbent polymer satisfies predetermined physical properties.

A method to purify a polymer is disclosed. The method is part of a manufacturing process wherein a virgin polymer is produced from a polymerization process employing at least a monomer or a comonomer as a feedstock. The monomer or the comonomer is selected from the group consisting of organic polar monomers, inorganic monomers, vinyl aromatic monomers, conjugated dienes, and mixtures thereof. In the method, the polymer in solid, liquid or molten state is brought into contact with a fluid solvent or an extraction fluid in a supercritical state or near supercritical state. The contact is at controlled temperature and pressure, allowing the fluid solvent to diffuse into the polymer and extract the impurities intended to remove. The method can be used to remove at least 10%, or at least 20%, or at least 50% of the target impurity from the polymer.

A method to purify a polymer is disclosed. The method is part of a manufacturing process wherein a virgin polymer is produced from a polymerization process employing at least a monomer or a comonomer as a feedstock. The monomer or the comonomer is selected from the group consisting of organic polar monomers, inorganic monomers, vinyl aromatic monomers, conjugated dienes, and mixtures thereof. In the method, the polymer in solid, liquid or molten state is brought into contact with a fluid solvent or an extraction fluid in a supercritical state or near supercritical state. The contact is at controlled temperature and pressure, allowing the fluid solvent to diffuse into the polymer and extract the impurities intended to remove. The method can be used to remove at least 10%, or at least 20%, or at least 50% of the target impurity from the polymer.