Analysis of the retrograde behavior in PMMA-CO2 systems by measuring the (effective) glass transition temperature using refractive index variations.
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| Title: | Analysis of the retrograde behavior in PMMA-CO2 systems by measuring the (effective) glass transition temperature using refractive index variations. |
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| Authors: | Rodríguez, D. Cuadra1 (AUTHOR) dcuadra@fmc.uva.es, Carrascal, D.1 (AUTHOR), Solórzano, E.2 (AUTHOR), Pérez, M.A. Rodríguez1 (AUTHOR), Pinto, J.1 (AUTHOR) jpinto@fmc.uva.es |
| Source: | Journal of Supercritical Fluids. Apr2021, Vol. 170, pN.PAG-N.PAG. 1p. |
| Subjects: | Refractive index, Behavioral assessment, Glass transition temperature, Manufacturing processes, Low temperatures |
| Abstract: | • A new optical-based method allows determining the effective T g of PMMA-CO 2 systems. • Retrograde behavior was experimentally confirmed at low pressures and temperatures. • The physical properties of the PMMA strongly influence the effective Tg evolution. • The obtained results clarified previous discrepancies found in the literature. • PMMA industrial processing could be performed at mild conditions introducing CO 2. ga1 The physical behavior of polymethyl methacrylate-carbon dioxide (PMMA-CO 2) system was studied in a wide range of temperatures (0–100 °C) and pressures (0.1–10 MPa). The glass transition temperature of the systems was determined by a new optical observation methodology. The developed procedure is based on the refraction index variations between rubbery and glassy states, which allowed to differentiate both PMMA states for each pair of temperature and pressure conditions. Following this procedure, retrograde behavior was confirmed for three different grades of PMMA, finding significant differences in their behavior. In addition, the study of the glass transition temperature of the PMMA-CO 2 systems included the low-pressure and low-temperature region, scarcely studied before. The new results obtained in the low pressure-temperature region are critical to design advanced foaming approaches and manufacturing processes at low temperatures. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Supercritical Fluids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 148503599 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Analysis of the retrograde behavior in PMMA-CO2 systems by measuring the (effective) glass transition temperature using refractive index variations. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rodríguez%2C+D%2E+Cuadra%22">Rodríguez, D. Cuadra</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dcuadra@fmc.uva.es</i><br /><searchLink fieldCode="AR" term="%22Carrascal%2C+D%2E%22">Carrascal, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Solórzano%2C+E%2E%22">Solórzano, E.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pérez%2C+M%2EA%2E+Rodríguez%22">Pérez, M.A. Rodríguez</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pinto%2C+J%2E%22">Pinto, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jpinto@fmc.uva.es</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Supercritical+Fluids%22">Journal of Supercritical Fluids</searchLink>. Apr2021, Vol. 170, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Refractive+index%22">Refractive index</searchLink><br /><searchLink fieldCode="DE" term="%22Behavioral+assessment%22">Behavioral assessment</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Manufacturing+processes%22">Manufacturing processes</searchLink><br /><searchLink fieldCode="DE" term="%22Low+temperatures%22">Low temperatures</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: • A new optical-based method allows determining the effective T g of PMMA-CO 2 systems. • Retrograde behavior was experimentally confirmed at low pressures and temperatures. • The physical properties of the PMMA strongly influence the effective Tg evolution. • The obtained results clarified previous discrepancies found in the literature. • PMMA industrial processing could be performed at mild conditions introducing CO 2. ga1 The physical behavior of polymethyl methacrylate-carbon dioxide (PMMA-CO 2) system was studied in a wide range of temperatures (0–100 °C) and pressures (0.1–10 MPa). The glass transition temperature of the systems was determined by a new optical observation methodology. The developed procedure is based on the refraction index variations between rubbery and glassy states, which allowed to differentiate both PMMA states for each pair of temperature and pressure conditions. Following this procedure, retrograde behavior was confirmed for three different grades of PMMA, finding significant differences in their behavior. In addition, the study of the glass transition temperature of the PMMA-CO 2 systems included the low-pressure and low-temperature region, scarcely studied before. The new results obtained in the low pressure-temperature region are critical to design advanced foaming approaches and manufacturing processes at low temperatures. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Supercritical Fluids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.supflu.2020.105159 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Refractive index Type: general – SubjectFull: Behavioral assessment Type: general – SubjectFull: Glass transition temperature Type: general – SubjectFull: Manufacturing processes Type: general – SubjectFull: Low temperatures Type: general Titles: – TitleFull: Analysis of the retrograde behavior in PMMA-CO2 systems by measuring the (effective) glass transition temperature using refractive index variations. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rodríguez, D. Cuadra – PersonEntity: Name: NameFull: Carrascal, D. – PersonEntity: Name: NameFull: Solórzano, E. – PersonEntity: Name: NameFull: Pérez, M.A. Rodríguez – PersonEntity: Name: NameFull: Pinto, J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 08968446 Numbering: – Type: volume Value: 170 Titles: – TitleFull: Journal of Supercritical Fluids Type: main |
| ResultId | 1 |
