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The mechanism of ozone cracking. I. Ozone cracking of plastic films
Author(s) -
Salomon G.,
Van Bloois F.
Publication year - 1963
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1963.070070325
Subject(s) - ozone , natural rubber , composite material , cracking , materials science , stress relaxation , stress (linguistics) , thermoplastic , chemistry , creep , organic chemistry , linguistics , philosophy
Stretched films from partly unsaturated natural rubber hydrochloride develop cracks and fracture in ozonized oxygen. Cracking occurs only above a minimum stress level of about 70 kg./cm. 2 . Ozone sensitivity increases exponentially with stress, but goes through a maximum near the yield point of the thermoplastic films. Contrary to rubbers, these high‐modulus materials do not undergo overall stress relaxation prior to fracturing induced by ozone. The rate of surface ozonization of an unstretched film is estimated gravimetrically and volumetrically; it is found to be similar to that of rubber surfaces. Physical and chemical changes of the ozonized surface are reported. Results are briefly compared with ozone attack on other (nonrubber) materials.