Polycarbonate

Polycarbonate
Lexan.svg
Repeating chemical structure unit of
Polycarbonate made from bisphenol A
VisibleLightSpectrum2.svg
Transmission spectrum of polycarbonate
Physical properties
Density (ρ) 1.20–1.22 g/cm3
Abbe number (V) 34.0
Refractive index (n) 1.584–1.586
Flammability V0-V2
Limiting oxygen index 25–27%
Water absorptionEquilibrium (ASTM) 0.16–0.35%
Water absorption—over 24 hours 0.1%
Radiation resistance Fair
Ultraviolet (1–380 nm) resistance Fair
Mechanical properties
Young's modulus (E) 2.0–2.4 G Pa
Tensile strengtht) 55–75 MPa
Elongation (ε) at break 80–150%
Compressive strength (σc) >80 MPa
Poisson's ratio (ν) 0.37
HardnessRockwell M70
Izod impact strength 600–850 J/m
Notch test 20–35 kJ/m2
Abrasive resistance ASTM D1044 10–15 m g/1000 cycles
Coefficient of friction (μ) 0.31
Speed of sound 2270 m/s
Thermal properties
Glass transition temperature (Tg) 147 °C (297 °F)
Heat deflection temperature
  • 0.45 MPa: 140 °C (284 °F)
  • 1.8 MPa: 128–138 °C (262–280 °F)
Vicat softening point at 50 N 145–150 °C (293–302 °F) [1]
Upper working temperature 115–130 °C (239–266 °F)
Lower working temperature −40 °C (−40 °F) [2]
Thermal conductivity (k) at 23 °C 0.19–0.22 W/(m·K)
Thermal diffusivity (a) at 25 °C 0.144 mm²/s [3]
Linear thermal expansion coefficient (α) 65–70 × 10−6/ K
Specific heat capacity (c) 1.2–1.3 kJ/( kg·K)
Electrical properties
Dielectric constant (εr) at 1 M Hz 2.9
Permittivity (ε) 2.568 × 10−11 F/m
Relative permeability (μr) at 1 MHz 0.866(2)
Permeability (μ) at 1 MHz 1.089(2) μN/ A2
Dissipation factor at 1 MHz 0.01
Surface resistivity 1015 Ω/sq
Volume resistivity (ρ) 1012–1014 Ω·m
Chemical resistance
Acidsconcentrated Poor
Acidsdilute Good
Alcohols Good
Alkalis Good-Poor
Aromatic hydrocarbons Poor
Greases and oils Good-fair
Halogenated hydrocarbons Good-poor
Halogens Poor
Ketones Poor
Gas permeation at 20 °C
Nitrogen 10–25 cm3·mm/(m2·day· Bar)
Oxygen 70–130 cm3·mm/(m2·day·Bar)
Carbon dioxide 400–800 cm3·mm/(m2·day·Bar)
Water vapour 1–2 gram·mm/(m2·day) @ 85%–0% RH gradient
Economics
Price 2.6–2.8 /kg [4]

Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique resin identification code (RIC) and are identified as "Other", 7 on the RIC list. Products made from polycarbonate can contain the precursor monomer bisphenol A (BPA).

Structure

Polycarbonates received their name because they are polymers containing carbonate groups (−O−(C=O)−O−). A balance of useful features, including temperature resistance, impact resistance and optical properties, positions polycarbonates between commodity plastics and engineering plastics.

Other Languages
العربية: بولي كربونات
български: Поликарбонат
bosanski: Polikarbonat
català: Policarbonat
čeština: Polykarbonát
Deutsch: Polycarbonate
español: Policarbonato
français: Polycarbonate
Bahasa Indonesia: Polikarbonat
íslenska: Pólýkarbónat
italiano: Policarbonato
Bahasa Melayu: Polikarbonat
Nederlands: Polycarbonaat
Nordfriisk: Polycarbonaat
norsk nynorsk: Polykarbonat
polski: Poliwęglany
português: Policarbonato
română: Policarbonat
Simple English: Polycarbonate
svenska: Polykarbonat
Türkçe: Polikarbonat
українська: Полікарбонат
Tiếng Việt: Polycacbonat
中文: 聚碳酸酯