INVESTIGADORES
FANOVICH Maria alejandra
artículos
Título:
Behavior of poly(methyl methacrylate)-based systems in supercritical CO2 and CO2 plus cosolvent: Solubility measurements and process assessment.
Autor/es:
C. DOMINGO, A. VEGA, M. A. FANOVICH, C. ELVIRA, P. SUBRA
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
Wiley
Referencias:
Año: 2003 p. 3652 - 3659
ISSN:
0021-8995
Resumen:
ABSTRACT: Microspheres based on synthetic polymers
such as poly(methyl methacrylate) (PMMA) and PMMA
blends are known for their medical and optical applications.
The development of methods for processing polymeric microspheres
using a nontoxic solvent, like supercritical carbon
dioxide (SCCO2), is desirable. This work investigates the
solubility and behavior of polymers (PMMA and PMMA/
polycaprolactone blend) and solutes (cholesterol and albumin)
in SCCO2 and SCCO2 cosolvent (acetone, ethanol,
and methylene chloride). The knowledge of solubility behavior
of materials in SCCO2 aids in the selection and/or
design of the most appropriate technique for materials processing.
Processing PMMA-based polymers with pure
SCCO2 leads to polymer swelling. The lack of polymer solubility
in pure CO2 precludes their micronization by the
RESS (rapid expansion of supercritical solutions) process,
but on the other hand allows their impregnation. Polymer
plasticization caused by CO2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
Microspheres based on synthetic polymers
such as poly(methyl methacrylate) (PMMA) and PMMA
blends are known for their medical and optical applications.
The development of methods for processing polymeric microspheres
using a nontoxic solvent, like supercritical carbon
dioxide (SCCO2), is desirable. This work investigates the
solubility and behavior of polymers (PMMA and PMMA/
polycaprolactone blend) and solutes (cholesterol and albumin)
in SCCO2 and SCCO2 cosolvent (acetone, ethanol,
and methylene chloride). The knowledge of solubility behavior
of materials in SCCO2 aids in the selection and/or
design of the most appropriate technique for materials processing.
Processing PMMA-based polymers with pure
SCCO2 leads to polymer swelling. The lack of polymer solubility
in pure CO2 precludes their micronization by the
RESS (rapid expansion of supercritical solutions) process,
but on the other hand allows their impregnation. Polymer
plasticization caused by CO2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
2), is desirable. This work investigates the
solubility and behavior of polymers (PMMA and PMMA/
polycaprolactone blend) and solutes (cholesterol and albumin)
in SCCO2 and SCCO2 cosolvent (acetone, ethanol,
and methylene chloride). The knowledge of solubility behavior
of materials in SCCO2 aids in the selection and/or
design of the most appropriate technique for materials processing.
Processing PMMA-based polymers with pure
SCCO2 leads to polymer swelling. The lack of polymer solubility
in pure CO2 precludes their micronization by the
RESS (rapid expansion of supercritical solutions) process,
but on the other hand allows their impregnation. Polymer
plasticization caused by CO2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
2 and SCCO2 cosolvent (acetone, ethanol,
and methylene chloride). The knowledge of solubility behavior
of materials in SCCO2 aids in the selection and/or
design of the most appropriate technique for materials processing.
Processing PMMA-based polymers with pure
SCCO2 leads to polymer swelling. The lack of polymer solubility
in pure CO2 precludes their micronization by the
RESS (rapid expansion of supercritical solutions) process,
but on the other hand allows their impregnation. Polymer
plasticization caused by CO2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
2 aids in the selection and/or
design of the most appropriate technique for materials processing.
Processing PMMA-based polymers with pure
SCCO2 leads to polymer swelling. The lack of polymer solubility
in pure CO2 precludes their micronization by the
RESS (rapid expansion of supercritical solutions) process,
but on the other hand allows their impregnation. Polymer
plasticization caused by CO2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
2 leads to polymer swelling. The lack of polymer solubility
in pure CO2 precludes their micronization by the
RESS (rapid expansion of supercritical solutions) process,
but on the other hand allows their impregnation. Polymer
plasticization caused by CO2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
2 precludes their micronization by the
RESS (rapid expansion of supercritical solutions) process,
but on the other hand allows their impregnation. Polymer
plasticization caused by CO2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
2 can be exploited in the PGSS
(particles from gas-saturated solutions) process. Addition of
a liquid cosolvent to CO2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2
2 enhances the dissolution of solutes
and polymers. Precipitation of the studied polymers by antisolvent
techniques seems feasible only by use of CO2 2
methylene chloride. © 2003 Wiley Periodicals, Inc. J Appl Polym
Sci 90: 36523659, 2003
© 2003 Wiley Periodicals, Inc. J Appl Polym
Sci 90: 36523659, 2003
Key words: amorphous PMMA; PMMA/PCL blends; supercritical
CO2; swelling; solubility
amorphous PMMA; PMMA/PCL blends; supercritical
CO2; swelling; solubility2; swelling; solubility