polycarbonate


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Related to polycarbonate: polycarbonate glasses

polycarbonate

(pŏl″ē-kăr′bĭ-nāt, -nĭt) [″ + ″]
A transparent polymer used to manufacture eye protectors, shields, and other medical devices.

Polycarbonate

A very strong type of plastic often used in safety glasses, sport glasses, and children's eyeglasses. Polycarbonate lenses have approximately 50 times the impact resistance of glass lenses.

index of refraction

The ratio of the speed of light in a vacuum or in air, c, to the speed of light in a given medium, v. Symbol: n. Hence,
n = c/v
The speed of light in a given medium depends upon its wavelength. Consequently, the index of refraction varies accordingly, being greater for short wavelengths (blue) than for longer wavelengths (red). The index of refraction forms the basis of Snell's law, which quantitatively determines the deviation of light rays traversing a surface separating two media of different refractive indices. Syn. refractive index. Plural: indices. See dispersion; law of refraction; gradient-index lens; high index lens; speed of light; refractometer.
Table I3 Refractive indices of some transparent media at selected wavelengths
spectral lineGFDCA
OriginCalciumHydrogenSodiumHydrogenOxygen
wavelength (nm)430.8486.1589.3656.3759.4
aqueous or vitreous humour1.34401.34041.33601.33411.3317
crystalline lens1.43071.42591.42001.41751.4144
spectacle crown1.53481.52931.52301.52041.5163
dense flint1.63971.62901.61701.61221.6062

Table I4 Index of refraction n of various media for sodium light (λ = 589.3)
air1.00
water (at 20ºC)1.333
spectacle crown glass1.523
flint glass (dense)1.62
flint glass (extra dense)1.65-1.70
titanium oxide glass1.701
calcite crystal
ordinary ray1.658
extraordinary ray1.486
quartz crystal
ordinary ray1.544
extraordinary ray1.553
diamond2.42
Canada balsam1.53-1.54
CR-391.498
polycarbonate1.586
silicone rubber1.44
CAB1.47
PMMA1.49
HEMA1.43
hydrogel polymer
20% water content1.46-1.48
75% water content1.37-1.38
eye
tears1.336
cornea1.376
aqueous humour1.336
crystalline lens (average effect)1.42
vitreous humour1.336

plastic 

Various organic or synthetic materials (e.g. CR-39, HEMA, polymethyl methacrylate, polycarbonate, etc.) that can be transformed into solid shapes to make spectacle frames, contact lenses, ophthalmic lenses, etc. and can be made to have good optical surfaces, high light transmission and refractive indices and dispersions similar to that of crown or flint glass. See acetone; index of refraction; plastic spectacle frame.
References in periodicals archive ?
The most basic types are end-cap additives, which control the length of the polycarbonate molecule by stopping the polymerization process.
After 1 week, the water samples were collected and analyzed to determine whether BPA had leached from the polycarbonate cages or was present in any of the negative control materials.
Polycarbonate market forecast for next five years, including market volumes and prices is also provided.
In addition to signage, the company's broad portfolio of Makrolon polycarbonate sheet products has been proven in the architectural, security, transportation, industrial and recreational markets.
In a less extreme experiment, distilled water was held in large polycarbonate containers for 39 weeks at room temperature.
Also debuting at Strategies in Light is Makrolon[R] Lumen XT LC0 polycarbonate sheet.
The study analyzes four key automotive applications of polycarbonate glazing namely, sidelite, backlite, sunroof, and lighting.
Especially lightweight, highly transparent, break-proof and easy to shape, polycarbonate is used in many areas of modern life from electronic and IT appliances to automotive parts to medical devices and LED lighting.
Sumika Styron Polycarbonate currently produces polycarbonate resins at production facilities in Niihama City, Ehime, Japan, and serves customers and markets throughout Asia.
Makrolon[R] SL polycarbonate sheet is used for the pedicab siding and canopy, which provide structure, protection from the elements and a backing surface for applying advertisements.
The Lexan Multiwall Polycarbonate Sheets from the Kapoor Plastics are the ideal solution for your roofing systems and for glazing.
USPRwire, Tue Apr 07 2015] North America Polycarbonate Market by Applications (Automotive, Consumer, Electrical & Electronic, Medical, Optical Media, Packaging & Sheet & Film) & Geography - Trends & Forecasts to 2019