TY - JOUR
T1 - Study of high permeability polymers by means of the spin probe technique
AU - Yampolskii, Y. P.
AU - Motyakin, M. V.
AU - Wasserman, A. M.
AU - Masuda, T.
AU - Teraguchi, M.
AU - Khotimskii, V. S.
AU - Freeman, B. D.
N1 - Funding Information:
The authors are grateful to Professors K.L. Makovetskii and E.Sh. Finkelshtein who kindly provided norbornene polymers for this study. The research described in this publication was made possible in part by Award no. RC2-347 of the US Civilian Research and Development Foundation for the Independent States of the Former Soviet Union (CRDF).
PY - 1999/3
Y1 - 1999/3
N2 - The spin probe technique was systematically applied to study a family of high permeability and high free volume glassy polymers. Rotation correlation times τc or frequencies v = 1/τc of 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) were measured in amorphous teflons - random copolymers of tetrafluoroethylene and 2,2-bistrifluoromethyle-4,5-difluoro-1,3-dioxole, polyacetylenes and polynorbornenes. Polymers distinguished by unusually high, for the glassy state, permeability and free volume exhibit large rotational mobility of TEMPO. The correlation times correspond to fast rotation of the spin probe previously observed only in rubbery polymers. Correlations between the frequency v and gas permeability and diffusion coefficients were observed. However, in some polymers, the spin probe's rotation rate is also sensitive to side-chain local mobility, which does not affect translational diffusion coefficients of gas molecules in polymers.
AB - The spin probe technique was systematically applied to study a family of high permeability and high free volume glassy polymers. Rotation correlation times τc or frequencies v = 1/τc of 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) were measured in amorphous teflons - random copolymers of tetrafluoroethylene and 2,2-bistrifluoromethyle-4,5-difluoro-1,3-dioxole, polyacetylenes and polynorbornenes. Polymers distinguished by unusually high, for the glassy state, permeability and free volume exhibit large rotational mobility of TEMPO. The correlation times correspond to fast rotation of the spin probe previously observed only in rubbery polymers. Correlations between the frequency v and gas permeability and diffusion coefficients were observed. However, in some polymers, the spin probe's rotation rate is also sensitive to side-chain local mobility, which does not affect translational diffusion coefficients of gas molecules in polymers.
KW - Glassy polymers
KW - High permeability polymers
KW - Spin probe technique
UR - http://www.scopus.com/inward/record.url?scp=0033102355&partnerID=8YFLogxK
U2 - 10.1016/S0032-3861(98)00395-4
DO - 10.1016/S0032-3861(98)00395-4
M3 - Article
AN - SCOPUS:0033102355
SN - 0032-3861
VL - 40
SP - 1745
EP - 1752
JO - Polymer
JF - Polymer
IS - 7
ER -