Rheological studies of polycaprolactone in supercritical CO2

Kelly, Catherine A.; Murphy, Shona; Leeke, Gary A.; Howdle, Steven M.; Shakesheff, Kevin M.; Jenkins, Michael J.

doi:10.1016/j.eurpolymj.2012.11.021

Cited by 17 publications

(19 citation statements)

References 25 publications

(17 reference statements)

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“…This transition is associated with the melting of crystal spherulites in the polymer. The T m at atmospheric pressure, as measured by rheology, is therefore 68.1 ± 0.6 °C, in good agreement with T m reported elsewhere in the literature [37,45] and with that measured by DSC in this work (64.6 ± 0.2 °C). This is a powerful demonstration of the ability of CO 2 to act as a temporary plasticiser for PCL, by diffusing into the polymer and interacting through Lewis acid/base interactions with the carbonyl groups of the backbone.…”

Section: Effect Of Pressure On T M Of Pcl10supporting

confidence: 92%

“…A change in the morphology of the polymer under CO 2 was also observed by Kelly et althrough infrared (IR) analysis by monitoring the carbonyl peak at 1720 cm -1 [44], and a decrease in the reptation time in the presence of high-pressure CO 2 was also found by the same group [45]. The plasticisation of this polymer under CO 2 was also studied optically [46,47] and through high-pressure calorimetry [48].…”

Section: Introductionmentioning

confidence: 54%

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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 On T M Of Pcl10supporting

confidence: 92%

Section: Introductionmentioning

confidence: 54%

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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“…Therefore, the viscosity is found to decrease, which indicates a shear-shinning behavior in all the regions [22,35]. Figure 3 shows the temperature shift factors and the Arrhenius (Eq.…”

Section: Feasibility Analysis Of the Measurementmentioning

confidence: 99%

“…However, the Couette geometry was not recommended for the rheological characterization of the polymer/CO 2 solution because the poor melt fluidity impeded the filling process and the geometry's large contact region limited the test range. Recently, researchers have been using a plate-plate geometry loaded in a high-pressure cell [21][22][23]. This configuration is beneficial for gas diffusion because the gap is just 1-2 mm and the sample can be easily cleaned.…”

Section: Introductionmentioning

confidence: 99%

Rheological properties of HDPE and LDPE at the low-frequency range under supercritical CO2

Wan

Sun

Liu

et al. 2017

The Journal of Supercritical Fluids

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The effects of temperature, pressure (using helium as the pressurizing medium) and dissolved CO 2 concentration on the rheological properties of linear high-density polyethylene (HDPE) and branched-chain low-density polyethylene (LDPE) were carefully investigated using a high-pressure rheometer. The results showed that at low pressure, the rheology of the PEs was sensitive to pressure increase. As the pressure increased to higher values, the rheology leveled off for HDPE and increased for LDPE. Under supercritical CO 2 , the plasticization of the dissolved gas contributed primarily to the thickening effect of pressure. Furthermore, the loss factors decreased with increasing pressure and increased with increasing CO 2 pressure. Lastly, the effect of gas concentration was described by the Fujita-Kishimoto model on the assumption that the coupled effect of pressure and CO 2 concentration could be separated.

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“…process intensification) is also attractive when making allowance for possible industrial applications. This is true for polymer blends where the effect of scCO 2 on the interfacial tension between the two polymers and the rheological behavior, both crucial in determining the final morphology, can be accurately measured . Even more interesting, from a scientific point of view, is the preparation of polymer composites, where scCO 2 can positively influence the dispersion of the filler or even help in exfoliating it (e.g.…”

Section: Functionalization and Blendingmentioning

confidence: 99%

Supercritical carbon dioxide and polymers: an interplay of science and technology

Picchioni

2014

Polym. Int.

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The increasing use of supercritical carbon dioxide (scCO 2 ) as a green solvent for polymer synthesis and processing reflects a still growing interest at academic and industrial level. The peculiar characteristics of scCO 2 , namely its plasticizing effect on polymeric structures and the enhanced chain mobility, render it an ideal medium for polymer synthesis and processing. The broad range of processes as well as of the polymeric structures often requires a deeper understanding of the effect of scCO 2 on polymeric structures at microscopic, mesoscopic and macroscopic levels. The aim of the present paper is to offer a perspective on this topic by outlining current and future challenges in this field.

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Rheological studies of polycaprolactone in supercritical CO2

Cited by 17 publications

References 25 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)

Rheological properties of HDPE and LDPE at the low-frequency range under supercritical CO2

Supercritical carbon dioxide and polymers: an interplay of science and technology

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