Radiation yield of hydrogen chloride in gamma‐irradiated poly(vinyl chloride) stabilized by epoxy compounds

Abstract

SynopsisThe G H C~ values of 7-irradiated PVC mixtures were studied after addition of various amounts of three epoxy stabilizers: diglycidyl ether of 2,2-bis(4-hydroxy-3-methylphenyl)propane (I); diglycidyl ether of l,l-bis(4-hydroxyphenyl)cyclohexane (II), and butyl-cis-9,lO-epoxystearate (111). The results indicated that two processes are essential for the stabilization: HC1 capture by the epoxy groups, and an external protective effect, due to the remaining part of the stabilizer molecule. The role of the benzene rings in stabilizers I and 11, as compared with the protective effect due to the long chains of stabilizer 111, is not as dominant as one would expect.

Synthesis and application of a novel environmental plasticizer based on cardanol for poly(vinyl chloride)

“…In addition, the HCl concentration decreased with the increase of ECPhP. This result was in agreement with literature results [48][49][50] which pointed out that epoxy groups could scavenge for HCl and delay the degradation events. Besides, small quantities of benzene were also emitted.…”

Radiation‐induced oxidative degradation of poly(vinyl chloride)

“…There are few practical results concerning the effects of plasticizers and stabilizers in the radiation oxidation of PVC. 4 The few articles published on the subject of irradiated epoxy compounds concern only practical methods of producing improved plastic^.^ It is our aim to study the effect of such additives on the gas evolution and oxidative degradation in y-irradiation of PVC, which is widely used for disposable medical supplies.…”

Effect of Di(2‐ethyl hexyl phthalate)/Epoxidized Soybean Oil and Calcium Stearate/Zinc Stearate Ratios on the Tensile Properties of Plasticized PVC Formulations. A Study for Calcium Stearate Rich Formulations

“…Epoxidized compounds are recognized as HCl scavengers. [1,[17][18] However, it has also been proposed that epoxidized soybean oil (ESO) participates in other stabilization reactions, where it reacts simultaneously with HCl and zinc stearate (''free'' or complexed). [18] Besides, in the catalytic presence of ZnCl 2 , epoxidized compounds react with such chloride to produce a chemical compound that is able to remove allylic chlorine atoms in PVC chains through an etherification reaction.…”