Pwcp. Kluit et al., REPLACEMENT OF ACETONE IN ACETONE-SWOLLEN POLYETHERIMIDE (PEI) FOILS WITH 1,1,1-TRICHLOROETHANE OR ETHANOL - AN [C-14] ACETONE AIDED RADIOTRACER STUDY, Journal of radioanalytical and nuclear chemistry, 219(1), 1997, pp. 47-50
A radiotracer based method for the determination of the rate of expel
of a swelling agent from a swelling agent saturated polymer foil induc
ed by a second organic liquid (i.e., blowing agent for foaming of poly
mers) has been set up and tested. The method was applied to acetone sw
ollen polyetherimide (PEI) foil and 1,1,1-trichloroethane and ethanol
(blowing agents) systems. By combining the results of radiotracer meas
urements with those obtained by measuring foil weights, the amount of
the respective blowing agents that replaced acetone in the PEI foil wa
s determined.