Pressure-volume-temperature-viscosity relations in fluorinated polymers

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Journal titleJournal of Applied Polymer Science
Pages11011105; # of pages: 5
AbstractRecently, Mekhilef published new data on the pressure– volume–temperature (PVT) behavior of fluorinated polymers, polyvinylidenefluoride (PVDF), and copolymers of poly(vinylidene-co-hexafluoropropylene) (PVDF-HFP). The author also reported on the viscoelastic performance of these resins in the solid and molten states. Since 1969, PVT dependencies have been analyzed by means of the Simha–Somcynsky (S–S) equation of state (EoS). The EoS has the formof coupled equations written in terms of the reduced variables: P˜ = P/P*, V˜ = V/V*, and T˜ = T/T*. According to Rodgers’s evaluation of several EoSs, the S–S EoS has provided the best description of the PVT behavior in the whole range of independent variables. From the fundamental point of view, the S–S EoS has a significant advantage over other EoS relations; simultaneously with V = V(T, P), it provides the hole fraction (h) as a function of P and T: h = h(T, P). The latter function has been shown4 to be directly related to the free volume fraction (f), for example, as determined by positron annihilation lifetime spectroscopy. The knowledge of h has been found useful in many applications, namely, the correlation of surface tension with bulk properties. Furthermore, it relates the equilibriumwith transport properties, for example, the constant stress viscosity of melts and their mixtures and other viscoelastic functions. Analysis of the new PVT data for fluoropolymers is of interest for several reasons. Because the tested samples were well characterized,1 it would be interesting to know how the changes of molecular weight and composition affect the reducing parameters, P*, V*, and T*. Once these parameters are known, the compressibility, thermal expansion coefficient, and cohesive energy density (or the solubility parameter) can easily be calculated. Furthermore, the interrelation between the melt viscosity and h should be examined.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number45047
NPARC number18382811
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Record identifier4937b1f5-19f6-4f77-baf6-26921e424a3b
Record created2011-08-05
Record modified2016-05-09
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