PMMA

A clear acrylic polymer used in transparent drawing tools.

Also known as
acrylic, acrylic glass, poly(methyl methacrylate), PMMA, Plexiglas

In everyday products

Structure and behaviour

[–CH₂–C(CH₃)(COOCH₃)–]ₙ

PMMA has an ester side group attached to a carbon–carbon backbone. It is made by addition through MMA double bonds, unlike PET or PBT, whose ester links form part of the backbone.

  • Its amorphous structure can give optical clarity without the large crystalline regions that scatter light in many polymers.
  • Below its softening region, a sheet is rigid enough for a straight ruler or a self-supporting display.
  • Heating increases chain mobility so a sheet can bend or draw over a mould; cooling fixes the new shape.
  • Cast and extruded acrylic sheets differ in how they are made and processed, even though both contain PMMA.
  • Standard acrylic is generally more brittle under impact than polycarbonate.

PMMA as a photoluminescence matrix

The PMMA record explains its carbon backbone, ester side groups, optical clarity and preparation from methyl methacrylate.

The 2025 emitter pair was measured in 1 wt% PMMA films. Here a familiar polymer holds the emitter while its optical response is measured.

The PMMA sample measures photoluminescence. Electrical device performance is measured using the OLED’s own host and layer structure.

The same 1 wt% PMMA-film comparison gives PL peaks of 473 and 463 nm for ν-DABNA-M and ν-DABNA-M-B-Mes. PMMA is the optical test matrix here, not the host used in the electrical OLEDs.

Explore the emitter comparison in Optoelectronics.

Preparation routes

Methyl methacrylate route

Addition polymerisation. MMA molecules join through their double bonds. Their ester groups remain as side groups; no acid-and-diol pair is required. The presence of ester groups in a monomer does not make this a condensation polymerisation: the growing backbone is built through carbon–carbon bonds.

Initiators and controlled curing support polymerisation. Sheet can be cast directly or made by extruding previously polymerised PMMA. Cast-sheet curing makes polymer and sheet together; extruded sheet begins with polymer made earlier.

  1. Manufacturing acrylic glass from MMAPLEXIGLAS / POLYVANTIS

Material limits

Notches, scratching and cleaning solvents affect acrylic. Bathtubs use a shell and backing; separated PMMA can enter mechanical or monomer-recovery routes.

Sources

  1. Manufacturing acrylic glass from MMAPLEXIGLAS / POLYVANTIS
  2. Mars 562 04 F: Plexiglas rulerSTAEDTLER
  3. Forming PLEXIGLAS sheetPLEXIGLAS / POLYVANTIS
  4. Polymer structure, crystallinity and physical propertiesOpenStax, Rice University
  5. PMMA sheet recycling and separationPLEXIGLAS / POLYVANTIS