Effect of γ-irradiation on bisphenol-a based unsaturated polyesters-part II

Unsaturated polyesters made by using bisphenol‐A, dimethyl‐di‐(3,5‐dichloro‐4‐hydroxyphenyl) methane, and dimethyl‐di‐(3,5‐dibromo‐4‐hydroxyphenyl) methane, respectively, were exposed to a does of 18 Mrad from a Co60 source. On irradiation, there is very little change in the halogen content in the p...

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Bibliographic Details
Published in:Die Angewandte makromolekulare Chemie 1977-09, Vol.64 (1), p.169-177
Main Authors: Gupta, S. K., Thampy, R. T.
Format: Article
Language:English
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Summary:Unsaturated polyesters made by using bisphenol‐A, dimethyl‐di‐(3,5‐dichloro‐4‐hydroxyphenyl) methane, and dimethyl‐di‐(3,5‐dibromo‐4‐hydroxyphenyl) methane, respectively, were exposed to a does of 18 Mrad from a Co60 source. On irradiation, there is very little change in the halogen content in the polyesters, determined by Parr Bomb method. This indicates their stability to γ‐irradiation. Study of acid value, intrinsic viscosity and isomerisation of these polyesters before and after irradiation corroborates to some extent that incorporation of aromatic rings in the polyester chain stabilises it against radiation. Minor changes in acid values and intrinsic viscosities are discussed. Ungesättigte Polyester aus Bisphenol‐A bzw. dimethyl‐di‐3,5‐dichlor‐4‐hydroxyphenyl‐methan und Dimethyl‐di‐3,5‐dibrom‐4‐hydroxyphenyl‐methan wurden einer 18 Mrad Dosis aus einer Co60‐Quelle ausgesetze. Untersuchungen des Halogengehalts, der Säurezahl, der Grenzviskosität und des Isomerengehalts vor und nach der Bestrahlung deuten auf eine verhältnismäßig hohe Strahlungsbeständigkeit hin.
ISSN:0003-3146
1522-9505
DOI:10.1002/apmc.1977.050640115