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Characteristics and radiolysis behavior of polyvinylchloride under accelerated proton and γ-irradiation

Journal Article · · Radiation Physics and Chemistry
 [1];  [2];  [3];  [4];  [4];  [3];  [4];  [4];  [4];  [4];  [5];  [4];  [2]
  1. Russian Academy of Sciences (RAS), Moscow (Russian Federation). Institute for Problems of Chemical Physics; OSTI
  2. Univ. of Alabama, Tuscaloosa, AL (United States)
  3. Kazan National Research Technological University (Russian Federation)
  4. Russian Academy of Sciences (RAS), Moscow (Russian Federation). Institute for Problems of Chemical Physics
  5. Moscow State Univ., Moscow (Russian Federation)

Here the effect of high energy protons and γ-irradiation on the structural properties, surface-energies, and toxicological properties of polyvinyl chloride (PVC) were studied due to the role PVC products play in many technologies including the nuclear industry. Accelerated 1–4 MeV protons impacting on PVC in vacuum lead to the formation of polyenyl radicals as shown by EPR and to an increase in free surface energy due to functionalization of the surface of the irradiated polymer. γ-irradiation leads to the formation of unsaturated bonds, carbonyl and hydroxyl groups as shown by IR and to the release of HCl. Correlated molecular orbital theory calculations of reaction thermodynamics were used to aid in the development of a mechanism in the absence of oxygen. The formation and accumulation of chromophores and auxochromic groups during γ-radiolysis of PVC leads to a gradual change of the initial white color of the polymer to yellow and then to brown and black with high sensitivity. A mixture of powdered PVC and silicate glue was used to determine the profile of a 60Co γ-radiation beam on targets with a complex relief. γ-irradiated polymer does not have a local irritating effect due to a single application to the skin of mice in an adhesive mixture at a concentration of up to 5000 mg/kg. γ-radiolysis of PVC powder in air with a dose of up to 1400 kGy does not affect its acute toxicity when administered intragastrically to BDF1 mice. PVC and its γ-irradiated analogs are non-toxic at doses ≤5000 mg/kg.

Research Organization:
Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
SC0018921
OSTI ID:
2420875
Journal Information:
Radiation Physics and Chemistry, Journal Name: Radiation Physics and Chemistry Vol. 201; ISSN 0969-806X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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