Poly(butadiene) (PBD), polyisoprene and poly(2-methyl pentadiene) (PMPD) tethered on a poly(tetrafluoroerhylene) (PTFE) surface were produced by a mechanical fracture of PTFE powder with butadiene, isoprene and 2-methyl-1,3-pentadiene monomer at 77 K, respectively. The tethered polymer has an unpaired electron (allyl radical) at the chain end. The allyl radical was used as a label of molecular motions of the end. The e.s.r. spectral change was observed in the temperature range of 77-223 K and assigned to molecular motions which were a conformation exchange and a rotational motion of allyl radicals (around C-C bond). The rotational motion of PBD radicals was the most vigorous among the three polymers. In contrast the e.s.r. spectral change for PMPD radicals was little observed and the mobility was the least. Moreover, the motions of end allyl radicals were accelerated by the residual monomer.