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Stabilization of gamma‐irradiated poly(vinyl chloride) by epoxy compounds. I. Radiation yield of hydrogen chloride and changes of epoxy group concentration in gamma‐irradiated PVC–stabilizer mixtures
Author(s) -
Lerke G.,
Lerke I.,
Szymański W.
Publication year - 1983
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.1983.070280206
Subject(s) - epoxy , diglycidyl ether , epoxide , polymer chemistry , propane , benzene , styrene , bisphenol a , polyvinyl chloride , materials science , oxide , chemistry , polymer , nuclear chemistry , organic chemistry , catalysis , copolymer
The G HCl values of γ‐irradiated PVC mixtures and the changes of the epoxy group concentration were studied after addition of various amounts of five epoxy stabilizers: diglycidyl ether of 2, 2‐bis(4‐hydroxy‐3‐methyl phenyl)propane (I), diglycidyl ether of 2, 2‐bis(4‐hydroxy‐3‐nitrophenyl)‐propane (II), styrene oxide (1, 2‐epoxy ethyl benzene) (IV), epoxidized ricinus oil (VI), and epoxidized soybean oil (Drapex 6.8.) (VII). It is stated that only about 50% of epoxy groups, declining in the system, take part in binding of HCl; the rest of these groups disappear as a consequence of other reactions. In connection with the data of the previous paper, 1 the results presented indicate that the process of stabilization goes in two stages. In the first stage the process consists of the HCl capture by the epoxy groups; in the second stage, due to the remaining part of the stabilizer molecule, a protective effect occurs. This effect consists, for the stabilizers I, II, IV, of gaining the energy by the benzene ring and, for the stabilizers VI, VII, of a mechanical drawing of polymer chains, which makes the energy transfer more difficult. Having the greatest content of epoxy oxygen (about 10%), the styrene oxide (IV) stabilizes best.