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Study of unsaturated polyester and vinylester morphologies using excimer laser surface treatment
Author(s) -
Mortaigne B.,
Feltz B.,
Laurens P.
Publication year - 1997
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/(sici)1097-4628(19971128)66:9<1703::aid-app8>3.0.co;2-h
Subject(s) - polyester , materials science , polystyrene , crazing , phase (matter) , excimer laser , fluence , composite material , polymer chemistry , scanning electron microscope , excimer , chemical engineering , laser , polymer , optics , chemistry , organic chemistry , physics , engineering
A technique based on the use of an ArF excimer laser (193 nm) to analyze the morphology of the unsaturated polyester and vinylester networks has been developed. This method is based on the use of the differences between the thresholds at which ablation of the various constituent phases of the materials occurs. After having determined the ablation threshold of a polystyrene, various surface treatments using excimer lasers fluence around this threshold were applied to unsaturated polyesters and vinylester. In the latter case, a two‐phase structure consisting of microgels in a polystyrene phase was shown by scanning electron microscopy observations, allowing us to conclude that the mechanisms by which vinylester and unsaturated polyester networks are formed are similar. We also observed that the two‐phase structure of the vinylester matrixes, unlike that of the unsaturated polyesters, is organized rather than random‐structured, which could represent a major parameter contributing to the very good hydrolysis stability of these materials. In the event of degradation by osmotic mechanisms, the organized structure network would enable limiting of the development of the osmotic pressures by distributing the forces within the material, thus avoiding crazing. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 1703–1714, 1997