Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

The rapid progress in development of new materials has also created more demands on their testing and characterization methods. In spite of the wide use of different plastics, there is a lack of methods to measure thermal diffusivity of polymers and other low-diffusivity materials. The diffusivity determination of oriented polymers is of particular interest: the drawing of a polymer foil orients the molecular chains, which strengthens the foil mechanically and also causes anisotropy to thermal conductivity making it higher parallel to the drawing direction than perpendicular to it. Anisotropy ratios as high as 100 have been reported [1]. The diffusivity through the foil could be measured by standard methods, like the flash method [2], but this way the diffusivity parallel to the foil surface can not be obtained. However, this can be measured by the optical beam deflection (OBD, mirage) technique [3]. Already the method has been applied to higher diffusivity samples than polymers, covering the range between 20 - 0.02 cm2/s [4, 5, 6, 7].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 6: Material Properties

Section

Thin Films and Coatings

Pages

1939-1946

DOI

10.1007/978-1-4615-2848-7_248

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

The Use of Optical beam Deflection (OBD) Technique in the Thermal Diffusivity Characterization of Polymer Foils

La Jolla, CA

The rapid progress in development of new materials has also created more demands on their testing and characterization methods. In spite of the wide use of different plastics, there is a lack of methods to measure thermal diffusivity of polymers and other low-diffusivity materials. The diffusivity determination of oriented polymers is of particular interest: the drawing of a polymer foil orients the molecular chains, which strengthens the foil mechanically and also causes anisotropy to thermal conductivity making it higher parallel to the drawing direction than perpendicular to it. Anisotropy ratios as high as 100 have been reported [1]. The diffusivity through the foil could be measured by standard methods, like the flash method [2], but this way the diffusivity parallel to the foil surface can not be obtained. However, this can be measured by the optical beam deflection (OBD, mirage) technique [3]. Already the method has been applied to higher diffusivity samples than polymers, covering the range between 20 - 0.02 cm2/s [4, 5, 6, 7].