PMMA – Transparent Acrylic Polymer for Optics and Engineering

Polymethyl Methacrylate (PMMA, PMMA) CAS 9011-14-7: Properties

1. Chemical Nature

The chemical formula repeats the methyl methacrylate unit. Free-radical polymerization is used to achieve various molecular weights and degrees of polymerization.

2. Physical and Mechanical Properties

Density: ~1.18 g/cm³

Hardness: High; can be increased by copolymerization with other acrylates.

Glass transition temperature: ~105°C

Solvents: Ketones, chlorinated hydrocarbons

3. Processing Technologies

Injection molding: Production of complex-shaped parts.

Extrusion: Profiles, sheet blanks.

Thermoforming: Vacuum forming of large panels and domes.

4. Applications

Aviation: Transparent canopies, cockpits.

Ophthalmology: Intraocular lenses, contact lenses.

3D printing: PMMA filament as an accessible alternative to PLA.

Automotive: Tail lights, instrument panels, exterior trim.

Construction: Glazing, sound barriers, skylights.

Signage: Illuminated signs, displays.

5. Safety

During processing: Ventilation must be provided to remove MMA vapors (during overheating).

Combustion: May sustain flame, with formation of CO, CO₂, and acrylic fragments.

6. Conclusion

Polymethyl methacrylate is one of the most important acrylic polymers, widely used in a variety of applications. The possibility of modification by chemical and physical methods opens prospects for new materials with improved strength, flexibility, and optical properties.