Poly Vinyl Ethyl Ether Research Articles

Effects of polymers as direct CO2 thickeners on the mutual interactions between a light crude oil and CO2

In this paper, two commercial polymers with relatively low molecular weights, poly vinyl ethyl ether (PVEE) and poly 1-decene (P-1-D), are tested as direct thickeners for CO2 and their detailed effects on the mutual interactions between a light crude oil and polymer-thickened CO2 are experimentally studied under different reservoir pressures. More specifically, the polymer cloud-point pressures are measured at different known polymer solubilities in supercritical CO2. The equilibrium interfacial tensions (IFTs) and onset pressures of quick polymer dissolution into CO2 are measured for the polymer−pure CO2 systems. The polymer-swelling effect due to pure CO2 dissolution is observed and examined. To study the mutual interactions between the light crude oil and polymer-thickened CO2, their equilibrium IFTs are measured and their so-called minimum miscibility pressures (MMPs) and onset pressures of the initial quick light-hydrocarbons extraction by CO2 are determined. The oil-swelling effect due to polymer-thickened CO2 dissolution is also visualized and analyzed. All the experimental data for polymer-thickened CO2 are compared with those for pure CO2.

Inverse gas chromatographic study of the surface properties of talc impregnated with different acidic and basic polymers

A severe limitation of inverse gas chromatography at infinite dilution (IGC-ID) is that it is mainly sensitive to high-energy sites making it difficult to obtain information about the surface of heterogeneous solids, e.g. the talc. In this paper, it is shown that a progressive impregnation of the talc surface with a suitable polymer can saturate the high-energy sites making the probes access less energetic free sites, specifically the basal surfaces of talc. Here, such impregnations are carried out using a surfactant (cetyltrimethylammonium bromide (CTAB)), different molecular weights polymers (polyethylene glycol (PEG) 2000, 20 000, 35 000, and 100 000) and polymers with different acidic or basic character (polyethylvinylether (PEVE), polyvinyl chloride (PVC), polymethylvinylketone (PMVK), and polystyrene (PS)). One of the aims of this study is to estimate the ratio of lateral and basal surfaces.

Synthesis of conducting block and graft copolymers with polyether segments

Synthesis of block and graft copolymers containing polyether and conducting polypyrrole sequences were described. Pyrrole moieties were incorporated at the chain ends of polytetrahydrofuran and polysiloxane and at the side chains of polyethyl vinylether by ionic polymerization and appropriate chemical reactions. Subsequent electropolymerization with pyrrole through these moities yielded free standing films of the corresponding block and graft copolymers. The formation copolymers was evidenced by FTIR spectroscopy and extraction with solvent of the precursor homopolymers. The thermal and morphological properties were also characterized. The two surface of the copolymer films generally differ in appearance, the surface at the solution side being cauliflowerlike or wrinkled, whereas the surface at the electrode side smooth. Conductivies of the copolymers were comparable with that of the pure polypyrrole.

Near-IR spectra of polyethylene, polyethylene glycol, and polyvinylethyl ether

The near-IR spectrum of polyethylene, polyethylene glycol, and polyvinylethyl ether have been measured. The CH and OH stretch and bend absorptions have been assigned using local mode theory. The CH stretch anharmonicities are about 57 cm−1, typical of CH anharmonicities in molecular samples. The CH bend anharmonicities are 7, 10, and 11 cm−1, respectively, for polyethylene, polyethylene glycol, and polyvinylethyl ether. The CH bend absorption intensities decrease by about a factor of 4 allowing these bending transitions to be observed up to the fourth overtone transition. © 1996 John Wiley & Sons, Inc.

Coupling of living polystyryllithium anions and living polyethyl vinyl ether cations

Living polystyryllithium anions and living polyethyl vinyl ether cations have been successfully coupled. Indeed, no residue of any of the two original homopolymers is observed in the final product, when they are used in a stoichiometric amount. This method has been exploited in order to synthesize AB and ABA polyethyl vinyl ether (PEVE) (A)/polystyrene (PSt) (B) block copolymers with a high efficiency.

Polyethyl vinyl ether as a viscosity additive to lubricating oils

1. The possibility of using polymers of ethyl vinyl ether as viscosity additives, which permits increasing the viscosity index of the thickened oils by 1.5–2 times and improving the viscosity-temperature properties of lubricating oils, has been demonstrated. 2. Additives based on polymers of ethyl vinyl ether, with an identical thickening capacity to that of the additive Vinypol, are superior to the latter in resistance to depolymerization. 3. In their capacity to increase the viscosity index, the additives obtained are on the same level as the best additives of this type.