Premium
Crosslinking poly(ethylene oxide) in dilute solutions by gamma rays
Author(s) -
Van Brederode R. A.,
Rodriguez F.,
Cocks G. G.
Publication year - 1968
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.1968.070120912
Subject(s) - torsion pendulum clock , materials science , modulus , ethylene oxide , plateau (mathematics) , dynamic modulus , irradiation , composite material , polymer , natural rubber , young's modulus , radiation , dynamic mechanical analysis , oxide , bulk modulus , polymer chemistry , analytical chemistry (journal) , chemistry , copolymer , optics , organic chemistry , mathematical analysis , physics , mathematics , quantum mechanics , nuclear physics , metallurgy
Abstract A high molecular weight poly(ethylene oxide) is gelled by radiation from a 60 Co source. At concentrations of 0.25 to 1 wt‐%, doses of 4.5 to 7.5 × 10 4 rad cause gelation. The storage modulus of the gel formed increases linearly with additional dose to a plateau value and then remains constant during further irradiation. The does needed to reach the plateau, D p in rads, and the plateau modulus G p in dynes per square centimeter, are related to the concentration c , in weight per cent: D p = 1.05 × 10 6 c and G p = 1.75 × 10 4 c 2.5 . The energy absorbed by the polymer per crosslink formed is about 80 ± 10 kcal/mol. The crosslink density produced by radiation is calculated from the measured modulus by using the theory of rubber elasticity. Both modulus and loss are measured in a special air‐bearing, recording torsion pendulum with a coneplate geometry.