Solubility and diffusivity of CO2 and N2 in polymers and polymer swelling, glass transition, melting, and crystallization at high pressure: A critical review and perspectives on experimental methods, data, and modeling

Kiran, Erdoǧan; Sarver, Joseph A.; Hassler, J. C.

doi:10.1016/j.supflu.2021.105378

Cited by 35 publications

(30 citation statements)

References 202 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the swelling degree for TPU was higher than for PLA. The carbonyl groups present in the polyester units of PLA ( Figure 9 a) can interact with the electron-deficient carbon atom of CO 2 via Lewis acid-base interaction [ 41 , 42 ]. However, stronger interactions may occur between TPU and CO 2 via intermolecular hydrogen bonding between the N-H in the urethane groups of TPU ( Figure 9 b) and the oxygen in CO 2 [ 41 ].…”

Section: Discussionmentioning

confidence: 99%

“…The carbonyl groups present in the polyester units of PLA ( Figure 9 a) can interact with the electron-deficient carbon atom of CO 2 via Lewis acid-base interaction [ 41 , 42 ]. However, stronger interactions may occur between TPU and CO 2 via intermolecular hydrogen bonding between the N-H in the urethane groups of TPU ( Figure 9 b) and the oxygen in CO 2 [ 41 ]. Moreover, the addition of ethanol as cosolvent increased the swelling of TPU, indicating that the presence of a polar cosolvent capable of forming hydrogen bonding improved the interaction between the fluid phase and the polymer urethane groups, inducing a higher swelling degree.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Screening of the Supercritical Impregnation of Olea europaea Leaves Extract into Filaments of Thermoplastic Polyurethane (TPU) and Polylactic Acid (PLA) Intended for Biomedical Applications

et al. 2022

View full text Add to dashboard Cite

The leaves of Olea europaea as agricultural waste represent a convenient source of antioxidants. In combination with supercritical CO2 (scCO2), assisted impregnation is an interesting strategy for the preparation of biomedical devices with specific bioactivity. For this purpose, 3D-printable filaments of thermoplastic polyurethane (TPU) and polylactic acid (PLA) were employed for the supercritical impregnation of ethanolic olive leaves extract (OLE) for biomedical application. The extraction of OLE was performed using pressurized liquids. The effect of pressure (100–400 bar), temperature (35–55 °C), and the polymer type on the OLE impregnation and the swelling degree were studied including a morphological analysis and the measurement of the final antioxidant activity. All the studied variables as well as their interactions showed significant effects on the OLE loading. Higher temperatures favored the OLE loading while the pressure presented opposite effects at values higher than 250 bar. Thus, the highest OLE loadings were achieved at 250 bar and 55 °C for both polymers. However, TPU showed c.a. 4 times higher OLE loading and antioxidant activity in comparison with PLA at the optimal conditions. To the best of our knowledge, this is the first report using TPU for the supercritical impregnation of a natural extract with bioactivity.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Screening of the Supercritical Impregnation of Olea europaea Leaves Extract into Filaments of Thermoplastic Polyurethane (TPU) and Polylactic Acid (PLA) Intended for Biomedical Applications

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Second, the hydrogen bonding network between TPU and polyurea promotes the crystallization of polymers 35,36 . However, when the amount of MDI exceeded 8%, the diffusion of excessive CO 2 interfered with the crystallization of macromolecules and inhibited the growth of crystalline grain 37 . The crystalline degree of T/P‐MDI10 dropped to 16.5% and the crystallization peak at 20.6° shifted to 19.9°.…”

Section: Resultsmentioning

confidence: 99%

Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

Wang

Chi

Liu

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

Passive warm‐keeping textiles could reduce carbon emissions by turning down indoor heating in winter. Polar bear hair exhibits a unique structure composed of a hollow core and an aligned porous shell, which extremely helps to resist heat transport. Great interest has arisen in the development of thermo‐insulating textiles with this biomimetic structure. In this work, cellular hollow fibers were made by a large‐scalable wet spinning‐foaming process. This efficient method achieved rapid formation of polar bear hair‐like fiber as well as facile turning properties of the fibers. The structure and properties of biomimetic fibers depended on the content of foaming agent. As‐prepared porous thermoplastic polyurethane (TPU)/polyacrylonitrile (PAN) composited fiber showed excellent ductility. The maximum tensile strength and breaking elongation was 4.31 MPa and 121%, respectively. The corresponding woven textile exhibited excellent thermal insulation properties even under deformation by compression or tension. The temperature difference across the thickness of textile was 17.9 and 34.9°C under a background temperature of 0 and 80°C, respectively. It may pave the way to fabricate new structure–function integrated fiber materials for warm‐keeping textiles.

show abstract

“…The tests were carried out at a constant temperature of 200 C, where, at a N 2 saturation pressure of 6.0 MPa, ω BA = 0.04. 25,26…”

Section: Visual Observation Apparatusmentioning

confidence: 99%

A design tool for core‐back timing in foam injection molding

Taki

Menale

Pisante

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

A visual observation experiment mimicking the pressure history in foam injection molding was utilized to infer the bubbles formation in core‐back operations. The different stages of bubble nucleation, dissolution, and re‐nucleation, corresponding to injection, packing, and core‐back opening, respectively, were studied. A reduction of the number density of re‐nucleated bubbles with respect to first nucleation was observed. In order to understand this observation, the evolution of the blowing agent concentration around the dissolved bubbles was analyzed. A characteristic time was introduced, required to achieve blowing agent uniformity or, equivalently, required to cancel the mass transport‐mediated memory of the system. A numerical model, assuming Fickian behavior, was derived and validated with the experimental results. The study allowed for the development of a predictive tool to design core‐back operations in foam injection molding.

show abstract

Solubility and diffusivity of CO2 and N2 in polymers and polymer swelling, glass transition, melting, and crystallization at high pressure: A critical review and perspectives on experimental methods, data, and modeling

Cited by 35 publications

References 202 publications

Screening of the Supercritical Impregnation of Olea europaea Leaves Extract into Filaments of Thermoplastic Polyurethane (TPU) and Polylactic Acid (PLA) Intended for Biomedical Applications

Screening of the Supercritical Impregnation of Olea europaea Leaves Extract into Filaments of Thermoplastic Polyurethane (TPU) and Polylactic Acid (PLA) Intended for Biomedical Applications

Large‐scalable polar bear hair‐like cellular hollow fibers with excellent thermal insulation and ductility

A design tool for core‐back timing in foam injection molding

Contact Info

Product

Resources

About