Simultaneous viscosity and density measurement of supercritical CO2-saturated PEG 400

Gourgouillon, Didier; Avelino, Helena Maria da Nóbrega Teixeira; Fareleira, João M. N. A.; Ponte, Manuel Nunes da

doi:10.1016/s0896-8446(98)00050-3

Cited by 85 publications

(60 citation statements)

References 14 publications

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“…The zero shear viscosity is dramatically decreased under CO 2 , in agreement with results obtained on other polymers such as amorphous poly(lactic acid) [31], poly(ethylene glycol) [19], and poly(dimethylsiloxane) [59]. At pressures above 120 bar the shear thinning region was less detectable in this shear rate range.…”

Section: Effect Of Pressure and Molecular Weight On The Viscosity Of Pclsupporting

confidence: 89%

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High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone)

Curia

Focatiis

Howdle

2015

Polymer

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(2015) High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone). Polymer, Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/45413/1/curia_polymer2015_preprint.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the Creative Commons Attribution Non-commercial No Derivatives licence and may be reused according to the conditions of the licence. For more details see: http://creativecommons.org/licenses/by-nc-nd/2.5/ A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Furthermore, a significant decrease in the viscosity of two PCL grades with different molecular weight (M n~1 0 kDa and 80 kDa) was also detected upon increasing the CO 2 pressure to 300 bar.Experimental viscosity data were fitted to the Carreau model to quantify the extent of the plasticising effects on the zero-shear viscosity and relaxation time under different conditions. Similar analyses were conducted under high-pressure nitrogen, to compare the effects obtained in the presence of a non-plasticising gas.

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Section: Effect Of Pressure and Molecular Weight On The Viscosity Of Pclsupporting

confidence: 89%

“…High-pressure CO 2 is able to plasticise and effectively liquefy many polymers at temperatures below their glass transition temperatures (T g ) and melting points (T m ) [2,16,[18][19][20][21][22][23][24][25][26][27], thereby opening up opportunities for new processes and incorporation of thermally labile molecules [17,28].…”

Section: Introductionmentioning

confidence: 99%

High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone)

Curia

Focatiis

Howdle

2015

Polymer

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“…Although high molecular weight molten PEG is normally quite viscous, the viscosity drops upon expansion of the PEG with CO2. 43 More volatile and CO2-soluble fractions of PEG with methoxy end-groups were used by Kobayashi as surfactants to create emulsions in scCO2 for homogeneous catalysis.…”

Section: Co2-expanded Ionic Liquidsmentioning

confidence: 99%

Homogeneous Catalysis and Catalyst Recovery Using Supercritical Carbon Dioxide and Ionic Liquids

Jessop

2003

J. Syn. Org. Chem., Jpn.

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The combination of scCO2 with a non-volatile liquid such as ionic liquids, water, or poly(ethylene glycol) creates a biphasic mixture suitable for homogeneous catalysis with facile catalyst/product separation and catalyst recycling. Continuous-flow processes are also possible. Dissolution of the CO2 into the nonvolatile liquid during the reaction can have desirable or undesirable effects on the properties of the liquid phase and the reaction performance. Examples of the use of these biphasic systems are described, with an emphasis on systems involving ionic liquids.

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“…CO2 has been exploited as a solvent for polymerisations (36,37), as a foaming agent (32,38), for precipitation/separation (39), particle formation (40,41) and encapsulation (42). High-pressure CO2 is a good solvent for many small molecules and it is very effective at plasticising and effectively liquefying many polymers at temperatures below their glass transition temperature (Tg) and melting point (Tm) (33,41,(43)(44)(45)(46)(47)(48)(49)(50)(51)(52), therefore opening up new opportunities for polymer synthesis and modification.…”

Section: Introductionmentioning

confidence: 99%

Green process for green materials: viable low-temperature lipase-catalysed synthesis of renewable telechelics in supercritical CO ₂

Curia

Barclay

Torrón

et al. 2015

Phil. Trans. R. Soc. A.

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SummaryWe present a novel near ambient temperature approach to telechelic renewable polyesters by exploiting the unique properties of supercritical CO2 (scCO2). Bio-based commercially available monomers have been polymerised and functional telechelic materials with targeted molecular weight were prepared by end-capping the chains with molecules containing reactive moieties in a one-pot reaction. The use of scCO2 as a reaction medium facilitates the effective use of Candida Antarctica Lipase B (CaLB) as a catalyst at a temperature as low as 35°C, hence avoiding side reactions, maintaining the end-capper functionality and preserving the enzyme activity. The functionalised polymer products have been characterised by 1 H-NMR, MALDI-TOF, GPC and DSC in order to carefully assess their structural and thermal properties. We demonstrate that telechelic materials can be produced enzymatically at mild temperatures, in a solvent-free system and using renewably sourced monomers without pre-modification, by exploiting the unique properties of scCO2. The macromolecules we prepare are ideal green precursors that can be further reacted to prepare useful bio-derived films and coatings.

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Simultaneous viscosity and density measurement of supercritical CO2-saturated PEG 400

Cited by 85 publications

References 14 publications

High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone)

High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone)

Homogeneous Catalysis and Catalyst Recovery Using Supercritical Carbon Dioxide and Ionic Liquids

Green process for green materials: viable low-temperature lipase-catalysed synthesis of renewable telechelics in supercritical CO ₂

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Simultaneous viscosity and density measurement of supercritical CO2-saturated PEG 400

Cited by 85 publications

References 14 publications

High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone)

High-pressure rheological analysis of CO2-induced melting point depression and viscosity reduction of poly(ε-caprolactone)

Homogeneous Catalysis and Catalyst Recovery Using Supercritical Carbon Dioxide and Ionic Liquids

Green process for green materials: viable low-temperature lipase-catalysed synthesis of renewable telechelics in supercritical CO 2

Contact Info

Product

Resources

About

Green process for green materials: viable low-temperature lipase-catalysed synthesis of renewable telechelics in supercritical CO ₂