High-pressure phase equilibria of polyethylene glycol-carbon dioxide systems

Daneshvar, Manouchehr; Kim, Seecheol.; Gulari, Esin

doi:10.1021/j100368a071

Cited by 77 publications

(44 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These are applied to both solid and molten polymers. An overview of the various methods is given in Table 1 [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42], and a brief discussion is given here of the more commonly used methods.…”

Section: Solubility Experimentsmentioning

confidence: 99%

Supercritical carbon dioxide as a green solvent for processing polymer melts: Processing aspects and applications

Nalawade

Picchioni

Janssen

2006

Progress in Polymer Science

568

181

View full text Add to dashboard Cite

Supercritical carbon dioxide (CO 2) is well established for use as a processing solvent in polymer applications such as polymer modification, formation of polymer composites, polymer blending, microcellular foaming, particle production and polymerization. Its gas-like diffusivity and liquid-like density in the supercritical phase allow replacing conventional, often noxious, solvents with supercritical CO 2. Though only a few polymers are soluble in supercritical CO 2 , it is quite soluble in many molten polymers. CO 2 dissolution in a polymer has been interpreted physically but FT-IR studies lead to an explanation in terms of weak interactions between basic and acidic sites. Various experimental methods and equations of state are available to measure or predict the solubility of CO 2. Dissolved CO 2 causes a considerable reduction in the viscosity of molten polymer, a very important property for the applications stated above. CO 2 mainly acts as a plasticizer or solvent when contacted with a polymer. Gas solubility and viscosity reduction can be predicted theoretically from purecomponent properties. In this review, experimental and theoretical studies of solubility and viscosity of several polymer melts are discussed in detail. Detailed attention is also given to recently reported applications along with aspects related to polymer processing.

show abstract

Section: Solubility Experimentsmentioning

confidence: 99%

Supercritical carbon dioxide as a green solvent for processing polymer melts: Processing aspects and applications

Nalawade

Picchioni

Janssen

2006

Progress in Polymer Science

568

181

View full text Add to dashboard Cite

show abstract

“…Gleichgewichte für PEG-Kohlendioxid wurden bisher über-wiegend nach der Probenahmemethode gemessen [11,12]. …”

Section: Bestimmung Der Zusammensetzung Und Der Dynamischen Viskositäunclassified

Phasenverhalten (S‐L‐G) und Transporteigenschaften binärer Systeme aus hochviskosen Polyethylenglykolen und komprimiertem Kohlendioxid

Kukova

Petermann

Weidner³

2004

Chemie Ingenieur Technik

View full text Add to dashboard Cite

show abstract

“…27 The preparation of polymer-gas solutions is described el~ewhere.~ T*( p ) dependences for a number of fixed concentrations x of PEG-COz solution at a chosen heating time t* were determined experimentally. These data were used to plot the T* (x; p = const) curves.…”

Section: Appendixmentioning

confidence: 99%

Spontaneous boiling up as a specific relaxation process in polymer-solvent systems

Скрипов

Puchinskis

1996

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

SYNOPSISThe phenomenon of spontaneous bubble nucleation in extremely supersaturated (superheated) polymer-solvent systems has been studied experimentally. Spontaneous boilingup temperatures T* for polystyrene and poly(ethy1ene glycol) solutions in a number of solvents have been measured at different values of pressure p and weight fraction of polymer c by the pulse heating method. The heating rate T varied from 10' to lo7 K/s. For all systems studied, the values of T* have been found to increase with increasingp and c. The T*(p, c) dependence is discussed with the use of the data on the degree of compatibility of components. The peculiarities of polymeric solutions manifest themselves in the region c + 1, as follows: (i) an abrupt increase (by 1-2 orders of magnitude) in the slope of the T*(c) dependence, and (ii) the appearance of the dependence of T* values on the heating rate. Our approach to the interpretation of this result assumes a change in the initial composition of a solution in the course of heating due to polymer decomposition. An example of the extended phase diagram of a polymer-solvent system including the kinetic surface of T*(p, c ) is given.

show abstract

High-pressure phase equilibria of polyethylene glycol-carbon dioxide systems

Cited by 77 publications

References 0 publications

Supercritical carbon dioxide as a green solvent for processing polymer melts: Processing aspects and applications

Supercritical carbon dioxide as a green solvent for processing polymer melts: Processing aspects and applications

Phasenverhalten (S‐L‐G) und Transporteigenschaften binärer Systeme aus hochviskosen Polyethylenglykolen und komprimiertem Kohlendioxid

Spontaneous boiling up as a specific relaxation process in polymer-solvent systems

Contact Info

Product

Resources

About