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The three molar refractions, R V, R GD and V ( n 2 - 1) / ( n 2 + 2) = R LL = ∑ i R LL,iįinally, in the 1950s, Vogel suggested a simpler expression that Power” of the material and the ratio (n – 1)/ ρ theĪnother expression for the molar refraction was developed by Lorentz and Lorenz (1880), which has also additivite properties: The quantity ( n - 1) is sometimes called the “brake This property is called molar refraction, R. The product of the specific refraction and the molar mass ( M) has addititive properties in regard to the structural groups in the molecule: In 1858 Gladstone and Dale observed that the ratio ( n - 1) / ρ is a characteristic constant for all organic substances which is called the Refractive index of the incident and refractive medium. Θ r are the angles of incident and refracted light.Ī similar law can be applied to light that crosses frome one material Where n is the index of refraction and θ i and The first law of optical refraction was discoverd by Snellius (1618)Īnd (independently) by Descartes (1637). With a weighted mean of 589.26 nm and symbolized by the letter D. It is usually reported for the the yellow sodium doublet line, Is directly related to the polarizability and depends on the wavelength of light. The refractive index is defined as the velocity of light in vacuum relative to the velocity in the polymer. The determination of the molecular weight,Īnd the size and shape of polymers in solutions. Measured in light scattering experiments, is needed in The specific refractive index increment (d n/d c) of dilute polymer solutions, Undergoes a second-order transition at the glass transition temperature,Īnd thus can be used to determine its value. Since it is characteristic forĮach material, it can be used for identification purposes or for the The knowledge of the refractive index is crucial in all opticalĪpplications of transparent polymers. Polymers and is widely used in material science. Deltech Polymers makes no warranties, express or implied, including merchantability or fitness for purpose nor is freedom from any patent owned by Deltech Polymers or other to be inferred and Deltech Polymers disclaims all liability for any resulting loss or damage.The refractive index ( n) is an important optical property of Since the foregoing is provided without charge and since use conditions and disposal are not within its control, Deltech Polymers assumes no obligation or liability for such information and recommendations and does not guarantee results from the use of products described or other information contained herein.
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They are intended as guidelines only.ĭELTECH POLYMERS CUSTOMER SERVICE: (800) 245-3150 These properties represent typical values obtained on specimens prepared and performed according to ASTM testing conditions. Products made using Deltech Polymer resins exhibit a clarity and gloss that is unsurpassed by competitive materials. Deltech Polymers produces resins with melt flow rates between 1.8 – 18.0 g/10 min for use in molding, compounding, blow molding and extrusion processes. Deltech Polymer’s multi-train production facility produces various crystal polystyrene products with high, medium and low melt processing characteristics combined with premium physical properties.