Evolution of the morphology of dispersed particles of various molecular weight poly(tetrafluorethylenedispersion particles has been examined as a function of sintering time and temperature. Substantialmolecular motion on the substrate occurs: large, angular particles form first for short melt times,followed by development of both planar, folded-chain single crystals, and single-molecule single crystalsand banded structures with parallel double striations oriented along their long axis. The moleculesin the latter two are parallel to the substrate. Deformation of the particles results in indefinitelength nanofibrils; sintering results in the growth of shish kebabs, again by individual moleculemobility. Tentatively it is suggested that the morphology develops in a mesomorphic “melt”,the morphology depending primarily on sintering time and temperature rather than the rate of cooling.Consideration is also given to the morphology of the nascent particles; chain folding during polymerizationis indicated for nanoemulsion particles.