Study of the influence of environmental factors on the optical parameters of transparent thermoplasts

by

V.P. Rudnev

Branch of Institute of Natural and Technical Systems in Sochi, Kurortny Av., 99/18

E–mail: stc-sochi@mail.ru

DOI: 10.33075/2220-5861-2021-3-127-132

UDC 620.193.21

Abstract:

   Every year the volume, assortment and areas of application of transparent thermoplastics, including as construction materials in modern high-tech products and devices, are expanding. At the same time, parts of products made of these materials are one of the most sensitive elements of the product exposed to the environment. In this work, we investigated the impact of the influencing factors of the coastal atmosphere in the region of a warm humid climate on the optical properties of transparent thermoplastics based on polymethyl methacrylate (PMMA) in non-oriented and oriented states. The spectral dependences of the exposed materials obtained after different periods of aging made it possible to determine the light transmission coefficients for fixed wavelengths, the transmission threshold and its stability, as well as to calculate the yellowness coefficient.

   Orientation has the most noticeable effect on the retention of the optical properties of PMMA polymers. For oriented polymers (AO-120), the yellowness coefficient reaches only 7–11% after a three-year exposure in an open atmospheric area, for non-oriented organic glasses (CO-120) this indicator for the same test period is 48–51%.

   The data obtained in this work are of undoubted interest for specialists involved in the creation and operation optical devices and technical systems, where the studied optical parameters are important physical parameters. A decrease in light transmission, a shift in the transmission threshold, a change in the transmission limit and optical density of transparent thermoplastics can significantly affect the performance characteristics of technical devices.

Keywords: full-scale climatic tests, transparent thermoplastics, polymethylmethycrylate, destruction, light transmission.

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