Abstract
The low-temperature graft polymerization of tetrafluoroethylene (TFE) on mineral supports (SiO2, Al2O3, TiO2, and activated charcoal) has been investigated by the microcalorimetry, ESR, and IR spectroscopy techniques. It has been shown that polymerization of TFE is initiated by radical ion centers formed upon radiolysis of the support. The initiation stage includes the interaction of a radical ion particle of the support with a monomer molecule yielding a growing neutral radical. The radical growth of polymer chains has been confirmed by the appearnce of the ESR spectrum of terminal fluoroalkyl radicals ∼CF2−CF2, and the covalent C-Si bonds of the polymer with the support have been detected by means of IR spectroscopy. The efficiency of the low-temperature graft polymerization depends on the monomer sorption and the sorbent nature: the highest efficiency is observed for Al2O3 and, then, macroporous glasses; grafting proceeds to the least extent (yield below 5%) on the carbon supports, which do not the form radical ion centers during radiation activation.
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