Sorption Thermodynamics and Mutual Diffusivity of Carbon Dioxide in Molten Polycaprolactone

Cotugno, S.; Maio, Ernesto Di; Ciardiello, Carmine; Iannace, Salvatore; Mensitieri, Giuseppe; Nicolais, L.

doi:10.1021/ie030092b

Cited by 37 publications

(35 citation statements)

References 29 publications

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“…The depression in melting point (T m ) or glass transition (T g ) temperature in polymers due to the sorption of CO 2 is a well-known phenomenon which is dependent on various factors such as crystallinity and presence of CO 2 -philic moieties [9][10][11][12][13][14] . Amorphous polymers are reported to show higher interactions with CO 2 than crystalline polymers 15,16 .…”

Section: Introduction-mentioning

confidence: 99%

Effect of Pressure on the Melting Point of Pluronics in Pressurized Carbon Dioxide

Bhomia

Trivedi

Mitchell

et al. 2014

Ind. Eng. Chem. Res.

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Abstract-The melting points of Pluronic® F-77, F-127, F-68, F-38 and F-108 were investigated in pressurised CO 2 between a pressure range of (2.0 to 50.0) MPa. Unprocessed and CO 2 -processed Pluronic® samples were analysed by differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD). A melting point depression in the range of (18.1± 0.5 to 19.3± 0.3) K was observed for all Pluronics® studied in this work. The melting point of Pluronics® in pressurised CO 2 was found to be independent of their molecular weight and poly (propylene oxide) [PPO] content. Analysis by DSC and PXRD revealed that CO 2 processing had no impact on the morphology of Pluronics®.

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Section: Introduction-mentioning

confidence: 99%

Effect of Pressure on the Melting Point of Pluronics in Pressurized Carbon Dioxide

Bhomia

Trivedi

Mitchell

et al. 2014

Ind. Eng. Chem. Res.

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“…Full details about the experimental procedure are given elsewhere (see Supporting Information Fig. S1) . The spring (Ruska, Houston, TX), whose sensibility is 0.0005 g/mm, is inserted in a water jacketed glass column, to keep the temperature constant within to ±0.1°C.…”

Section: Methodsmentioning

confidence: 99%

Improving surface and transport properties of macroporous hydrogels for bone regeneration

Guarino

Galizia

Álvarez-Pérez

et al. 2014

J Biomedical Materials Res

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Hydrogels have been frequently considered as suitable materials for hard tissue engineering as mineralized extracellular matrix analogue. However, major lacks in bone-substitution still concern the mimicking of native microenvironment for promoting cell differentiation into osteogenic way. Here, we propose the study of mineralized macroporous hydrogels (mMHs) made of poly(ethylenglycol)diacrylate fabricated by the combination of ultraviolet photopolymerization/salt leaching technique and treated by osteopromotive medium. We demonstrate that peculiar morphological and chemical features of mMH are crucial to create a reservoir system able to efficiently recruit environmental signals to cells. In particular, mass transport mechanisms are regulated by the coupling of a Knudsen-type diffusion within the void space of the pores with a standard diffusion mechanism through the pores walls. Meanwhile, the deposition of hydrophilic mineral phases onto the pore surface further affects transport mechanisms, in view of their capability to establish interactions with water molecules and to exert mechanical constrains on the swelling of the hydrogel network, thus promoting slower diffusion kinetics. These properties concur to influence in vitro human mesenchymal stem cells activities: macropore architecture of the hydrogel-like network positively affects cell recognition as compared to nonporous scaffolds, while osteopromotive treatment mainly allows to guide differentiation in osteogenic way as proved by staining of in vitro formed Ca-rich mineral deposits (i.e., alizarin red) and expression via reverse transcription-polymerase chain reaction of main bone markers. Hence, mMH is promising to develop three-dimensional scaffolds as experimental model to study in vitro cell events during bone regeneration.

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“…As expected, the rheological curves of both the mixture containing 2.3% of CO 2 and the mixture containing 1.5% of N 2 are shifted to lower values with respect to pure PCL, maintaining a similar dependence on shear rate. To use eq 15 to predict these experimental data, the following parameters were used for the pure PCL T = 100 °C, P = 40bar, V 1 = 0.9609 cm 3 /g, from experimental data ( T is set in the capillary zone of the extrusion line, P is the mean pressure inside of the capillary, V 1 is measured by PVT tests51) h 1 = 0.1049, obtained from the experimental PVT data and eq 10, h = 1− y for the mixture with ω c = 2.3 wt % of CO 2 T = 100 °C, P = 80 bar, from experimental, extrusion data V 2 = 0.9585; h 2 = 0.1092, obtained theoretically using the SS‐EOS For the mixture with ω c = 1.5 wt % of N 2 T = 100 °C, P = 120 bar, from experimental, extrusion data V 2 = 0.9647; h 2 = 0.1064, obtained theoretically using the SS‐EOS …”

Section: Methodsmentioning

confidence: 99%

“…for the pure PCL T = 100 °C, P = 40bar, V 1 = 0.9609 cm 3 /g, from experimental data ( T is set in the capillary zone of the extrusion line, P is the mean pressure inside of the capillary, V 1 is measured by PVT tests51) h 1 = 0.1049, obtained from the experimental PVT data and eq 10, h = 1− y …”

Section: Methodsmentioning

confidence: 99%

A predictive approach based on the Simha–Somcynsky free‐volume theory for the effect of dissolved gas on viscosity and glass transition temperature of polymeric mixtures

Maio¹,

Iannace²,

Mensitieri³

et al. 2006

J Polym Sci B Polym Phys

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The gas concentration and pressure effects on the shear viscosity of molten polymers were modeled by using a unified approach based on a free volume theory. A concentration and pressure dependent “shift factor,” which accounts for free volume changes associated with polymer‐gas mixing and with variation of absolute pressure as well as for dilution effects, has been herein used to scale the pure polymer viscosity, as evaluated at the same temperature and atmospheric pressure. The expression of the free volume of the polymer/gas mixture was obtained by using the Simha and Somcynsky equation of state for multicomponent fluids. Experimental shear viscosity data, obtained for poly(ε‐caprolactone) with nitrogen and carbon dioxide were successfully predicted by using this approach. Good agreement with predictions was also found in the case of viscosity data reported in the literature for polystyrene and poly(dimethylsiloxane) with carbon dioxide. Free volume arguments have also been used to predict the Tg depression for polystyrene/carbon dioxide and for poly(methyl methacrylate)/carbon dioxide mixtures, based on calculations performed, again, with the Simha and Somcynsky theory. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 1863–1873, 2006

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Sorption Thermodynamics and Mutual Diffusivity of Carbon Dioxide in Molten Polycaprolactone

Cited by 37 publications

References 29 publications

Effect of Pressure on the Melting Point of Pluronics in Pressurized Carbon Dioxide

Effect of Pressure on the Melting Point of Pluronics in Pressurized Carbon Dioxide

Improving surface and transport properties of macroporous hydrogels for bone regeneration

A predictive approach based on the Simha–Somcynsky free‐volume theory for the effect of dissolved gas on viscosity and glass transition temperature of polymeric mixtures

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