Polyethylene oxide PEO resin

PEO resin, also known as polyethylene oxide resin, is an important polymer material with various unique properties and applications. The following is a detailed introduction to PEO resin:

Chinese name：Polyethylene oxide (chemical substance)

Foreign name：polyethylene oxide

other    name：Polyethylene oxide, ethylene glycol ether

chemical formula：-[CH2-CH2-O]-

simple    Name:PEO

1、 Definition and Structure

PEO resin, also known as polyethylene oxide or polyethylene oxide, has the molecular formula HOCH2CH2O [CH2CH2O] nH. It is a crystalline, thermoplastic water-soluble polymer, a high molecular weight homopolymer formed by multiphase catalytic ring opening polymerization of ethylene oxide.

2、 Physical properties

1. Appearance and morphology: PEO resin is usually a white granular and powdery polymer with high crystallinity, and the high molecular weight polymer has a spherical crystal structure.

2. Solubility: PEO resin is completely soluble in water, and its aqueous solution is neutral or weakly alkaline. High molecular weight PEO resin can be mixed with water in any proportion at room temperature to form a viscous solution. With the increase of PEO concentration, the solution gradually becomes gel like or even rubber like elastomer.

3. Stability: PEO aqueous solution is relatively stable under neutral or alkaline conditions, but not stable enough under acidic conditions, especially at pH values of 3-5. However, as long as there is no oxidant present and it is used in neutral or weakly alkaline environments, the stability of its aqueous solution can be guaranteed.

3、 Chemical properties

PEO resin has good chemical stability, but due to the unshared electron pairs on the ether oxygen atoms in its polymerized long chain, it has strong hydrogen bonding affinity and can form complex with some electron acceptors.

4、 Molecular weight and viscosity

The molecular weight of PEO resin can vary greatly, for example, PEO-18Z with a molecular weight of 4.3 to 4.8 million can have a viscosity of 250 to 430 mpa. s in a 0.5% aqueous solution at 25 ℃. In addition, the viscosity of PEO aqueous solution is not only related to the molecular weight of the polymer and the concentration of the solution, but also to factors such as the temperature, shear rate, and concentration of inorganic salts added to the solution.

5、 Application Fields

PEO resin has a wide range of applications in multiple fields due to its unique properties:

1. Adhesive: PEO resin, as a low toxicity water-soluble resin, has strong gelling properties in its aqueous solution. Therefore, it is often used as a structural adhesive for tooth repair materials and as an adhesive with other materials.

2. Detergent: PEO resin plays a thickening and lubricating role in detergents, making them more viscous and smooth to the touch.

3. Ink, paint, and coating: The addition of PEO resin can improve the performance of ink, paint, and coating, such as increasing chromaticity and uniformity, and preventing uneven brightness levels.

4. Ceramic molding: In the ceramic molding process, the addition of PEO resin can improve the mixing uniformity of clay, prevent drying and cracking, and thus increase the yield and quality of ceramic products.

5. Packaging film: The film made of PEO resin is a good packaging material, such as for inner packaging of cigarettes.

6、 Precautions for use

1. Mixing speed: As PEO is a high molecular weight resin, high-speed mixing will break its molecular chains and reduce the viscosity of the gel, so the mixing speed should be controlled.

2. Storage conditions: PEO aqueous solution is prone to decomposition when exposed to light (especially ultraviolet light), so the prepared powder should be covered and stored in a cool place.

3. Temperature effect: The viscosity of PEO aqueous solution is greatly affected by temperature. As the temperature increases, the viscosity decreases. When preparing, it is important to maintain a stable ambient temperature as much as possible.

In summary, PEO resin is a high-performance and versatile polymer material with important application value in multiple fields.