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Protective effect of nitrous oxide on radiation‐induced degradation of polyisobutylene
Author(s) -
Okada Yoichi
Publication year - 1963
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.1963.070070518
Subject(s) - nitrous oxide , irradiation , oxide , viscosity , materials science , branching (polymer chemistry) , intrinsic viscosity , degradation (telecommunications) , radiation , composite material , chemistry , polymer chemistry , organic chemistry , polymer , metallurgy , optics , physics , telecommunications , computer science , nuclear physics
Polyisobutylene was irradiated by γ‐rays from a Co 60 source in vacuum and in nitrous oxide atmosphere. The irradiated specimens in N 2 O were damaged to a lesser extent than those in vacuum. Irradiated specimens were dissolved in CCl 4 and their viscosity was measured at 30°C. A plot of reciprocal of viscosity‐average molecular weight against dose gives a straight line in each case for specimens irradiated in vacuum and in N 2 O. Moreover, the presence of nitrous oxide reduces the extent of main‐chain fracture to 63%. The degree of branching is nearly the same for all of the specimens, since Huggins' constant k' is constant ( k' = 0.40) throughout our experiments. It can be concluded that the N 2 O has a protective effect for main‐chain fracture of polyisobutylene.