P‐V‐T properties of alternating poly(ethylene‐propylene) liquids

Abstract

The pressure‐volume‐temperature (P‐V‐T) properties of monodisperse alternating poly(ethylene‐propylene) (hydrogenated polyisoprene) melts of varying molecular weights are measured at 0.1 MPa < P < 200.1 MPa, and 290 K < T < 510 K in a dilatometer‐type apparatus. The Flory‐Orwoll‐Vrij (FOV), Modified Cell Model (MCM), Sanchez‐Lacombe (SL), and the Statistical Associating Fluid Theory (SAFT) equations of state are found to correlate the experimental data with excellent accuracy, except either at low pressures and high temperatures, or at high pressures and low temperatures. On average, MCM and SAFT fit the data slightly better than FOV and SL. The equation‐of‐state parameters are found to be independent of molecular weight, especially for SAFT, as required by the theory. © 1994 John Wiley & Sons, Inc.

PVT properties of polyethylene copolymer melts

“…The SAFT EOS parameters characterize the effective chain segment of copolymer, and especially, are independent of molecular weight [2]. The modified cell model (MCM) and the Simha-Somcynsky (SS) EOS are the most accurate relations for representation of polymer melts PVT as considered by Rodgers [6].…”

“…Zoller et al [1] measured PVT of poly(vinyl acetate)/polyethylene copolymer and discussed in terms of the sequential structure of the copolymer chain. PVT properties of monodisperse alternating poly(ethylene-propylene) (hydrogenated polyisoprene) melt of varying molecular weights were measured by Chen et al [2]. They reported that parameters of the statistical associating fluid theory (SAFT) equation of state were independent of molecular weight.…”

Phase structural analyses of polyethylene extrusion coatings on high‐density papers. I. Monoclinic crystallinity

“…During the line fitting, phases were fixed to 31.0 and 34.4 ppm, respectively, relative to the orthorhombic crystalline peak that was set to 33.0 ppm. [3][4][5][6] The program fitted the chemical shift of the interfacial PE. Estimated error in the measurements of mass fractions derived from measurements in the present work is of the order of Ϯ 0.02.…”

“…The detection of monoclinic phases of polyethylene with similar CP MAS 13 C NMR spectra is reported. [3][4][5][6][7]13 The quantification of the monoclinic fraction through line-fitting procedures depend on setting a fixed chemical shift of this monoclinic fraction due to this lack of resolution. In the present work the size of the monoclinic fraction will be somewhat sensitive to the chemical shift chosen.…”

Structural and dynamic study of chemically modified polyHIPE by solid‐state 13C NMR spectroscopy

“…In this way, a wide range of polyHIPE-supported functional groups was obtained, from alkyl or aryl amines to acids through halogens, alcohols, aldehydes, esters, and many other derivatives obtained by solid-phase chemical modification. 2 Cross-polarity/magic-angle spinning (CP/MAS) 13 C NMR is a good tool to evaluate a polymer's structure because it has many intrinsic advantages. Cross-polarization enables a spectrum to be acquired very quickly, with a better signal-to-noise ratio.…”