Solid phase
Official name
Poly(methyl methacrylate)
Secondary names
Poly(methyl 2-methylpropenoate); Methyl methacrylate resin; PMMA; acrylic glass; Plexiglas; Perspex
CAS number
9011-14-7
Type
Family
molecular solid
Class
non polar molecular solid
Compound type
homopolymer
Terminal function
H
Monomer number
n, up to ?
Molar mass
100.115 per mer unit g/mol
Polymolecularity index
1
Chemical composition
Formula
H−(−CH2CH3C−COOCH3)n−H
Chemical formula
(H2)(C5O2H8)n
Elemental formula
(C)10-n (H)18-n (O)4-n
Isotope mixture type
terrestrial abundance
None
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
∙[(CH2CH3C(COOCH3))]∙ methyl methacrylate mer molecule 2 - n 1 constituent mer main
H Hydrogen element 2 1 constituent element main
Composition comments
The formula is n repeting units + 2 −H terminal functions
Chemical functions
  Function Number
R−C(=O)−O−R 1
Chemical bonds
  Bond Number
≥C−C≤ n
≥C−C≤ 2
⪖ 1
>C=O 1
\eqslantgtr C-O- 1
\geq C-O- 1
\geq C-H 8
Class
molecular solids with apolar molecules (01)
Type
with polyatomic organic apolar molecules (CnHm...) (01.06)
Phase type
unknown
Molar mass
100.115 g/mol
Density
1.17 - 1.20 g/cm^3
State NTP
solid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid 160 °C (433 K)
Refringence type
unknown
Refraction index n_{\alpha}
1.4905 @ 589nm
Pure color
colorless
Diaphaneity
transparent
Luster
vitreous
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