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ABSTRACT: A dynamic mechanical study has been carried out on· a polypentenamer and its hydrogenated de­rivatives. The temperature range was from -160 to 130° and frequencies of 3.5, 11, and 110 Hz were employed. The starting polypentenamer was amorphous and the completely hydrogenated derivative resembled linear poly­ethylene with a melting point of 130° and a degree of crystallinity of 85%. Three relaxation regions were found in the temperature and frequency range investigated and these are labeled a, {:J, and -y in order of decreasing tem­perature. The a relaxation (5-115°, 3.5 Hz) is absent in the amorphous polymers and those of …