Physical properties of acetal PMMA

Acetals and PMMA(polymethyl methacrylate) are two different chemicals that each have unique physical properties. The following is an introduction to the physical properties of the two:

Physical properties of acetals

Acetal is a class of organic compounds formed by the condensation of one molecule of aldehyde with two molecules of alcohol, its physical properties include:

Appearance and smell: Acetals are usually colorless volatile liquids with a pleasant aroma.

Melting point and boiling point: the melting point of acetals is low, generally below -100 ° C, and the boiling point varies according to the specific compound, such as the boiling point of acetaldehyde diethyl alcohol is 104 ° C, and the boiling point of benzaldehyde dimethyl alcohol is 207 ° C.

Density: The density of an acetal is generally less than water, such as the relative density of an acetal (water =1) is 0.83.

Solubility: Acetal can dissolve in water and ethanol, ethyl ether, acetone, chloroform and other organic solvents.

Stability: The acetal has a tendency to polymerize when placed and is stable to the base, but it will undergo a hydrolysis reaction when heated in a dilute acid.

Physical properties of PMMA(polymethyl methacrylate)

PMMA is a polymer, commonly known as plexiglass, whose physical properties include:

Transparency: PMMA has a very high transparency, light transmittance of more than 92%, is a high-quality organic transparent material.

Density: The density of PMMA is about 1.15-1.19g/cm³, which is about half the density of glass.

Melting point and glass transition temperature: The melting point of PMMA is about 130-140℃, and the glass transition temperature is about 104℃.

Mechanical properties: PMMA has good toughness and mechanical strength, tensile, bending, compression and other strengths are higher than polyolefin, also higher than polystyrene, polyvinyl chloride and so on.

Thermal performance: The heat resistance of PMMA is medium, the maximum continuous use temperature is between 65℃-95℃ with different working conditions, and the thermal decomposition temperature is slightly higher than 270℃.

Processing performance: PMMA is easy to process and can be processed by injection molding, extrusion and other ways.

Other properties: PMMA also has good dielectric and electrical insulation properties, as well as excellent arc resistance.

Sum up

The physical properties of acetal and PMMA are significantly different. Acetal is mainly a kind of organic compounds with fragrance, volatile, soluble in a variety of solvents, and PMMA is known for its excellent transparency, good mechanical properties and processing properties, is widely used in many fields of polymer materials.