Supercritical processing of CO 2 -philic polyhedral oligomeric silsesquioxane (POSS)-poly( l -lactic acid) composites

Novendra, Novendra; Hasırcı, Nesrin; Dilek, Çerağ

doi:10.1016/j.supflu.2016.06.022

Cited by 9 publications

(23 citation statements)

References 46 publications

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“…A large number of nanofillers have been used for preparation, characterization, and foaming studies of biodegradable and nonbiodegradable thermoplastics. These include clays (layered silicates), [ 32,90–92 ] carbon nanotubes (CNTs), [ 93–96 ] graphene, [ 97–99 ] polyhedral oligomeric silsesquioxane (POSS), [ 100,101 ] and ceramics. [ 102–104 ]…”

Section: Thermoplastic Polymeric Materials Used For Foamingmentioning

confidence: 99%

Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

Banerjee¹,

Ray

2020

Macro Materials & Eng

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Figure 6. a) Schematic of underwater pelletization as a following unit of a foam extrusion system. For expandable beads, the water pressure is set above the vapor pressure of the blowing agent; for expanded, it lies at atmospheric pressure. b) Bead foam processing in a steam-chest molding machine: 1: closing and 2: filling the mold, 3: steaming, 4: cooling, 5: ejection of molded part. Reproduced with permission. [53] Copyright 2015, Elsevier.

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Section: Thermoplastic Polymeric Materials Used For Foamingmentioning

confidence: 99%

Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

Banerjee¹,

Ray

2020

Macro Materials & Eng

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“…These nanoparticles can be modified with different functional groups to have the desired properties, 40 which can be very advantageous in scCO 2 foaming process, if they are functionalized with CO 2 -philic groups. [41][42][43][44] The effects of highly CO 2 -philic POSS as cell nucleators on the scCO 2 foaming performance of the polymer were studied for the first time by Novendra et al 45 In this study, highly crystalline poly(Llactic acid) (P L LA) was used as the matrix material. P L LA is known to require high processing temperature close to its melting temperature and pressure around or above 20 MPa to be foamed with scCO 2 .…”

Section: Introductionmentioning

confidence: 99%

Controlling the foam morphology of supercritical CO₂‐processed poly(methyl methacrylate) with CO₂‐philic hybrid nanoparticles

Ozkutlu

Bayram

Dilek

2021

J of Applied Polymer Sci

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Highly CO 2 -philic nanoparticles, octatrimethylsiloxy polyhedral oligomeric silsesquioxanes (POSS) are used to increase the affinity of poly(methyl methacrylate) (PMMA) to CO 2 in supercritical carbon dioxide (scCO 2 ) foaming, thus to improve its foaming performance and the foam morphology. PMMA and PMMA-POSS composite foams were produced based on the two-factorial design, at the upper and lower experimental conditions of pressure, temperature, processing time, and venting rate. The foams of PMMA-5% POSS composites exhibited smaller average pore sizes and higher pore densities than neat PMMA and PMMA-0.5% POSS composites. The smallest average pore diameter (0.3 μm) and the highest pore density (6.33 × 10 12 cm −3 ) were obtained with this composite processed at 35 C, 32 MPa, for 24 h and depressurized with fast-venting rate (0.4 MPa/s). ScCO 2 processing decreased the density of the polymer by more than 50%.

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“…However, aggregation of POSS materials and the limitation of their solubility are important hindrances of the POSS applications . Recently it was shown that POSS can be CO 2 ‐philic and solubilized in supercritical CO 2 provided that it has certain functional groups, which allows applications of POSS in environmentally benign supercritical processing of materials …”

Section: Introductionmentioning

confidence: 99%

“…In previous solubility studies, trifluoropropyl POSS was found to be highly soluble in scCO 2 , while octamethyl POSS was insoluble . In a recent study trifluoropropyl POSS was used as a pore inducer in supercritical foaming of poly( L ‐lactic acid) (P L LA) with crystallinity greater than 30% . Such semicrystalline polymers are known to require processing temperatures close to the melting temperatures of the polymers during supercritical CO 2 processing.…”

Section: Introductionmentioning

confidence: 99%

“…[8] In a recent study trifluoropropyl POSS was used as a pore inducer in supercritical foaming of poly( L -lactic acid) (P L LA) with crystallinity greater than 30%. [11] Such semicrystalline polymers are known to require processing temperatures close to the melting temperatures of the polymers during supercritical CO 2 processing. Using 30% trifluoropropyl POSS by weight in P L LA, a porous P L LA with porosity of 40% was obtained at 408C and 20.7 MPa.…”

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Density functional theory study of interactions between carbon dioxide and functionalized polyhedral oligomeric silsesquioxanes

Tezsevin

Demirtas

Önal

et al. 2017

Int J of Quantum Chemistry

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Polyhedral Oligomeric Silsesquioxanes (POSS) are cage‐structured inorganic–organic hybrid materials which can be used in various industrial applications. It is recently discovered that POSS structures with certain functional groups can be solubilized in supercritical CO2 allowing their applications in environmentally benign supercritical processing of materials. In this theoretical study, nature and energetics of the interactions of octatrifluoropropyl POSS, octatrifluoromethyl POSS, and octamethyl POSS with CO2 are investigated according to the principles of density functional theory (DFT) by use of Gaussian 09 software. Simulations show that CO2‐octamethyl POSS pair has hydrogen bonding between the O atom of CO2 and the H atom of the methyl group, and CO2‐octatrifluoromethyl POSS pair has interactions between the C atom of CO2 and the F atom of the trifluoromethyl group. CO2‐octatrifluoropropyl POSS pair is found to have both interaction types. The octamethyl, the octatrifluoromethyl and the octatrifluoropropyl POSS structures have interaction energies of −2.18 kcal/mol, −3.10 kcal/mol, and −3.77 kcal/mol, respectively. This shows that the presence of Lewis acid–Lewis base interaction between C and F instead of hydrogen bonding between O and H atoms enhances the interaction of the molecule with CO2, while the presence of both interactions between the octatrifluoropropyl POSS‐CO2 pair makes the intermolecular interaction even stronger.

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Supercritical processing of CO 2 -philic polyhedral oligomeric silsesquioxane (POSS)-poly( l -lactic acid) composites

Cited by 9 publications

References 46 publications

Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

Controlling the foam morphology of supercritical CO₂‐processed poly(methyl methacrylate) with CO₂‐philic hybrid nanoparticles

Density functional theory study of interactions between carbon dioxide and functionalized polyhedral oligomeric silsesquioxanes

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Supercritical processing of CO 2 -philic polyhedral oligomeric silsesquioxane (POSS)-poly( l -lactic acid) composites

Cited by 9 publications

References 46 publications

Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

Foamability and Special Applications of Microcellular Thermoplastic Polymers: A Review on Recent Advances and Future Direction

Controlling the foam morphology of supercritical CO2‐processed poly(methyl methacrylate) with CO2‐philic hybrid nanoparticles

Density functional theory study of interactions between carbon dioxide and functionalized polyhedral oligomeric silsesquioxanes

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Controlling the foam morphology of supercritical CO₂‐processed poly(methyl methacrylate) with CO₂‐philic hybrid nanoparticles