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
FlammabilityV0-V2
Limiting oxygen index25–27%
Water absorptionEquilibrium (ASTM)0.16–0.35%
Water absorption—over 24 hours0.1%
Radiation resistanceFair
Ultraviolet (1–380 nm) resistanceFair
Mechanical properties
Young's modulus (E)2.0–2.4 GPa
Tensile strengtht)55–75 MPa
Elongation (ε) at break80–150%
Compressive strength (σc)>80 MPa
Poisson's ratio (ν)0.37
HardnessRockwellM70
Izod impact strength600–850 J/m
Notch test20–35 kJ/m2
Abrasive resistance ASTM D104410–15 mg/1000 cycles
Coefficient of friction (μ)0.31
Speed of sound2270 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 N145–150 °C (293–302 °F)[1]
Upper working temperature115–130 °C (239–266 °F)
Lower working temperature−40 °C (−40 °F)[2]
Thermal conductivity (k) at 23 °C0.19–0.22 W/(m·K)
Thermal diffusivity (a) at 25 °C0.144 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 MHz2.9
Permittivity (ε)2.568 × 10−11 F/m
Relative permeability (μr) at 1 MHz0.866(2)
Permeability (μ) at 1 MHz1.089(2) μN/A2
Dissipation factor at 1 MHz0.01
Surface resistivity1015 Ω/sq
Volume resistivity (ρ)1012–1014 Ω·m
Chemical resistance
AcidsconcentratedPoor
AcidsdiluteGood
AlcoholsGood
AlkalisGood-Poor
Aromatic hydrocarbonsPoor
Greases and oilsGood-fair
Halogenated hydrocarbonsGood-poor
HalogensPoor
KetonesPoor
Gas permeation at 20 °C
Nitrogen10–25 cm3·mm/(m2·day·Bar)
Oxygen70–130 cm3·mm/(m2·day·Bar)
Carbon dioxide400–800 cm3·mm/(m2·day·Bar)
Water vapour1–2 gram·mm/(m2·day) @ 85%–0% RH gradient
Economics
Price2.6–2.8 /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