A New Refractometric Method for Obtaining the Amorphous Density of Crystalline Polymers

Kaneko, Rokuro; Kitazaki, Yasuaki; Sakuma, Kenichi

doi:10.1295/koron1944.24.459

Cited by 3 publications

(2 citation statements)

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“…Experimental refractive indices were obtained at temperature T 1 , n D (exptl). Experimental densities, at T 2 , d ( T 2 , exptl), were taken from refs and − . Corrected densities, d ( T 1 )= d ( T 2 , exptl) × d ( T 1 ,QSPR)/ d ( T 2 ,QSPR), with, d ( T 1 ,QSPR), d ( T 2 ,QSPR), were estimated according to ref .…”

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confidence: 99%

Polymer Optical Constants from Long-Range Corrected DFT Calculations

Maekawa

Moorthi

2016

J. Phys. Chem. B

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A methodology to calculate refractive indices of plastics based on the Lorentz-Lorenz equation has been proposed. The polarizability of the nonconjugated polymer repeat units is predicted using the long-range corrected functionals. The end effect corrections in repeat unit models are essential to achieve accuracy similar to that observed for molecular liquids (ca. 1% in mean absolute deviation). The functionals with 100% Hartree-Fock (HF) exchange in the long-range limit perform best for aromatic and other hydrogen-deficient compounds; the Coulomb-attenuated hybrid exchange-correlation functional (CAM-B3LYP) performs very well for hydrogen-rich (usually, fully saturated) compounds. Exceptionally good agreement is observed for the sets of wavelength-dependent refractive index data for polystyrene, poly(methyl methacrylate), and for poly(perfluoro-4-vinyloxy-1-butene) (CYTOP), for which the root-mean-square deviations are 0.004, 0.002, and 0.004, respectively.

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confidence: 99%

Polymer Optical Constants from Long-Range Corrected DFT Calculations

Maekawa

Moorthi

2016

J. Phys. Chem. B

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“…Oxygen (a) and carbon dioxide (b) permeability as a function of refractive index: blend polymer and triblock copolymer in this study (); other polymers with π electrons (); without π electrons () …”

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confidence: 93%

Gas transport and optical properties of ABA-type triblock copolymers designed using fluorine-containing polyimide macroinitiators with methyl methacrylate

et al. 2013

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Abstract4,4'-(Hexafluoroisopropylidene) diphthalic anhydride 2,3,5,6-tetramethyl-1,4-phenylenediamine (6FDA-TeMPD) polyimide macroinitiator was synthesized and reacted with poly(methyl methacrylate) (PMMA) to form an ABA-type triblock copolymer by atom transfer radical polymerization. The effect of the ABA-type triblock copolymer structure on solid, thermal, optical and gas transport properties was systematically investigated and compared with the physical blend polymer. The blend polymer was cloudy, whereas the triblock copolymer was colorless and transparent. The PMMA component decomposition temperature for the triblock copolymer slightly shifted to higher temperature, while its gas barrier property was higher than the blend polymer. The refractive index and the gas permeability decreased while maintaining the heat resistance by a high nanoscale distribution of both polymer components. The 6FDA-TeMPD/PMMA ABA-type triblock copolymer can be described as a polymer material with high heat resistance, high gas barrier property and low refractive index amongst existing polymers.

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