Abstract
The behavior of probe molecules of different sizes (1,2-bromofluoroethane, 1,2-dichloroethane, dichloromethoxyphosphine oxide, 1,2-di-p-bromophenylethane) in PMMA and PVAC was considered. There is a linear correlation between the freezing temperature of conformational transitions of probe molecules and the size of the rotating groups of the probe. Processes that lead to the freezing-in of conformational equilibria of probes in polymers with a decrease in temperature are discussed on the basis of these results. The free-volume distribution and the nature of secondary relaxation processes in glassy polyvinyltrimethylsilane and polytrimethylsilylpropyne were studied by means of the conformation-probe technique.
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Original Russian Text © A.B. Remizov, D.I. Kamalova, 2007, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2007, Vol. 49, No. 5, pp. 779–785.
This work was supported by the Russian Foundation for Basic Research, project no. 05-03-33010, and the INTAS Foundation, grant no. 01-172.
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Remizov, A.B., Kamalova, D.I. Freezing-in of molecular mobility of small molecules (probes) in glassy polymers and secondary relaxation transitions. Polym. Sci. Ser. A 49, 503–508 (2007). https://doi.org/10.1134/S0965545X07050033
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DOI: https://doi.org/10.1134/S0965545X07050033