Dielectric properties of fluorinated polymers

SynopsisThe evaluation of the permeation parameters of water for Teflon FEP has shown that permeation is a dual mode process: Water is initially adsorbed onto the polymer surface in a layer; because the residence time of the layer is short, little is ultimately absorbed. The diffusion process is disrupted a t the onset of molecular motion, a t the glass transition, due to an increase in effective tortuosity. Variations of the permeation parameters with thickness suggest a skin, of total thickness near 25 pm, whose permeation parameters differ from those of the bulk.

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Thermal analysis of poly(vinyl fluoride)

Hanes

Lando

1993

J of Applied Polymer Sci

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SYNOPSISA sub-T,,, transition at approximately 50°C in poly( vinyl fluoride) has been attributed to a number of physical factors. We have studied this effect using differential scanning calorimetry. The rate dependence of the endothermic peak at approximately 50°C indicates that it is a second order transition. However, the recovery behavior is time dependent. It is observed in perfect head-to-tail, perfectly linear polymer and thus is not a consequence of head-to-head or tail-to-tail defects or branch points. The transition appears to be a time dependent rearrangement of the polymer chains.

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Dielectric properties of fluorinated polymers

Cited by 14 publications

References 41 publications

Pulsed-laser-deposited and plasma-polymerized polytetrafluoroethylene (PTFE)-like thin films: A comparative study on PTFE-specific properties

Pulsed-laser-deposited and plasma-polymerized polytetrafluoroethylene (PTFE)-like thin films: A comparative study on PTFE-specific properties

Water permeation of polymer films. IV. Teflon FEP

Thermal analysis of poly(vinyl fluoride)

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