Accession Number : AD0676186

Title :   INVESTIGATION OF THE CHANGE IN PROPERTIES OF POLYMETHYLMETHACRYLATE TRANSPARENCIES UNDER THE ACTION OF ULTRA-VIOLET IRRADIATION, VACUUM AND TEMPERATURE,

Corporate Author : MINISTRY OF TECHNOLOGY LONDON (ENGLAND) TECHNICAL INFORMATION AND LIBRARY SERVICES

Personal Author(s) : Sentyurin,E. G. ; Osikina,E. S. ; Perov,B. V. ; Gudimov,M. M.

Report Date : 1968

Pagination or Media Count : 7

Abstract : Ultra-violet irradiation with I = 14 milliwatt/sq cm results in damage to the surface of ST1 polymethylmethacrylate transparencies (perspex), with the result that the further use of this perspex as an optical material is impossible. Ageing of the perspex in air and in a vacuum at t = 80C has practically no effect on the ultimate strength. However, the specific elongation may be reduced under these conditions. The relationships obtained for the strength properties of the surface layers of the perspex as a function of time of UV irradiation show the advantage of oriented perspex as compared with unoriented perspex. (Author)

Descriptors :   (*ACRYLIC RESINS, OPTICAL PROPERTIES), SURFACE PROPERTIES, DEGRADATION, ULTRAVIOLET RADIATION, MECHANICAL PROPERTIES, VACUUM, AGING(MATERIALS), ELONGATION, USSR

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE