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1 January 1992 All-polymeric infrared reflecting films
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Proceedings Volume 10261, Infrared Thin Films: A Critical Review; 1026103 (1992)
Event: Critical Reviews, 1991, San Jose, CA, United States
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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Walter J. Schrenk, Ray A. Lewis, John A. Wheatley, and Charles B. Arends "All-polymeric infrared reflecting films", Proc. SPIE 10261, Infrared Thin Films: A Critical Review, 1026103 (1 January 1992);

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