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Proceedings Paper

All-polymeric infrared reflecting films
Author(s): Walter J. Schrenk; Ray A. Lewis; John A. Wheatley; Charles B. Arends
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Paper Abstract

Coextruded multilayer films consisting of 657 layers of three different polymers have been made which reflect near infrared wavelengths while transmitting visible light. A repeating multilayer stack of the three polymers in layer sequence A/B/C/B with optical thickness ratios of 2/1/2/1 suppress second through fourth order reflectance when refractive indices of the polymers are chosen so that nB = (nAnC)11/2. Broadband reflectance of solar infrared can be obtained by imposing a layer thickness gradient through the crossection of the film. Compared to conventional vacuum deposited multilayer interference stacks, all-polymeric films can be tough and thermoformable. They do not corrode and there is no metal waste. Potential applications include solar energy management. Multilayer film design, polymer specification and coextrusion of initial films to demonstrate feasibility are described.

Paper Details

Date Published: 1 January 1992
PDF: 15 pages
Proc. SPIE 10261, Infrared Thin Films: A Critical Review, 1026103 (1 January 1992); doi: 10.1117/12.58687
Show Author Affiliations
Walter J. Schrenk, Dow Chemical Co. (United States)
Ray A. Lewis, Dow Chemical Co. (United States)
John A. Wheatley, Dow Chemical Co. (United States)
Charles B. Arends, Dow Chemical Co. (United States)


Published in SPIE Proceedings Vol. 10261:
Infrared Thin Films: A Critical Review
Ric P. Shimshock, Editor(s)

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