Absorption coefficient of unpigmented poly(methyl methacrylate), polystyrene, polycarbonate, and poly(4‐methylpentene‐1) sheets

Progelhof, R. C.; Franey, J. P.; Haas, Thomas

doi:10.1002/app.1971.070150724

Cited by 18 publications

(11 citation statements)

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“…The absorption of radiation in semi‐transparent media is a complex but well‐studied phenomena . In‐depth absorption of radiation has applications to ablative materials for reentry bodies and hypersonic vehicles , thermoforming and processing of polymers , thin‐film glazing for solar thermal systems , and prediction of polymer burning rates in fires .…”

Section: Introductionmentioning

confidence: 99%

Absorption and reflection of infrared radiation by polymers in fire‐like environments

et al. 2011

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SUMMARY In large‐scale fires, the input of energy to burning materials occurs predominantly by radiative transfer. The in‐depth (rather than just surface) absorption of radiant energy by a polymer influences its ignition time and burning rate. The present investigation examines two methods for obtaining the absorption coefficient of polymers for infrared radiation from high‐temperature sources: a broadband method and a spectral method. Data on the total average broadband transmittance for 11 thermoplastics are presented (as are reflectance data), and the absorption coefficient is found to vary with thickness. Implications for modeling of mass loss experiments are discussed. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Absorption and reflection of infrared radiation by polymers in fire‐like environments

et al. 2011

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“…In this plot, the following objects have been considered: a homogeneous sphere made of gold Q Au a (special case with ratio r/d = 0) and three designs of a layered sphere, where the core is made of silicon, and it is coated by gold. The absorption of the layered sphere is based on the normalization of (42) simi- larly as in the previous examples, but here, the scattering coefficients f τ ml (43) are expressed in terms of the transition matrices t (i) τ l for layered spherical objects, see (B20) in Appendix B 5. The designs have been considered for three different ratios between the radius of core r and the thickness of shell d: r/d ∈ {2, 3, 5}.…”

Section: Numerical Examplesmentioning

confidence: 99%

“…Surface-enhanced biological sensing with molecular monolayer spectroscopy is another related application, see e.g., 26 . In photonic applications and in plasmonics, dielectric substrates based on polymeric media are usually considered to be lossless at optical frequencies 21,43 . However, some of the substances that are used can also show significant losses such as with z-doped PMMA materials 3 .…”

Section: Introductionmentioning

confidence: 99%

Optical theorems and physical bounds on absorption in lossy media

Ivanenko¹,

Gustafsson²,

Nordebo³

2019

Opt. Express

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Two different versions of an optical theorem for a scattering body embedded inside a lossy background medium are derived in this paper. The corresponding fundamental upper bounds on absorption are then obtained in closed form by elementary optimization techniques. The first version is formulated in terms of polarization currents (or equivalent currents) inside the scatterer and generalizes previous results given for a lossless medium. The corresponding bound is referred to here as a variational bound and is valid for an arbitrary geometry with a given material property. The second version is formulated in terms of the T-matrix parameters of an arbitrary linear scatterer circumscribed by a spherical volume and gives a new fundamental upper bound on the total absorption of an inclusion with an arbitrary material property (including general bianisotropic materials). The two bounds are fundamentally different as they are based on different assumptions regarding the structure and the material property. Numerical examples including homogeneous and layered (coreshell) spheres are given to demonstrate that the two bounds provide complimentary information in a given scattering problem.

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“…[28,34] In fact, the calculated extinction by scattering corresponded to an attenuation coefficient in the range of 10 4 -10 5 cm À1 while the bulk absorption coefficient of, e.g., PS, is as low as 0.1 cm À1 at l ¼ 1000 nm and <50 cm À1 at l ¼ 300 nm. [35] We included the effect of the QDs on the refractive index of the QD-loaded PS core by using a weighted average of the refractive indices of PS and bulk CdSe. Absorption by the QDs was also included in the calculation, however, the contribution of the QDs to extinction due to scattering and absorption was negligible owing to the small volume fraction of QDs.…”

Section: Extinction Properties Of Hybrid Microspheresmentioning

confidence: 99%

Polymer Multilayer Microspheres Loaded with Semiconductor Quantum Dots

Petukhova

Paton

Wei

et al. 2008

Adv Funct Materials

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Optically active nanostructures comprised of polymer multilayer microspheres surrounding semiconductor quantum dots are studied. Comparative analysis of the optical properties of the microspheres with four alternating layers with different refractive indices is performed. Photoluminescence and extinction characteristics of the microspheres are determined by the dimensions, internal structure, and the average refractive index of the particles.

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Absorption coefficient of unpigmented poly(methyl methacrylate), polystyrene, polycarbonate, and poly(4‐methylpentene‐1) sheets

Cited by 18 publications

References 1 publication

Absorption and reflection of infrared radiation by polymers in fire‐like environments

Absorption and reflection of infrared radiation by polymers in fire‐like environments

Optical theorems and physical bounds on absorption in lossy media

Polymer Multilayer Microspheres Loaded with Semiconductor Quantum Dots

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