Untitled

Shieh, Yeong‐Tarng; Liu, Kuan-Han

doi:10.1023/a:1021189800844

Cited by 39 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…of 32.2% and 8.9%, respectively). These results agree with those found in literature,12, 13, 28, 34 in which it is showed that solubility of fluorinated polymers is much higher than styrene‐based polymers. This indicates that fluorinated blocks are acting as CO 2 trapping sites, leading to a great increase in the CO 2 solubility with respect to neat PS.…”

Section: Resultssupporting

confidence: 93%

See 1 more Smart Citation

Investigation of the nanocellular foaming of polystyrene in supercritical CO₂ by adding a CO₂‐philic perfluorinated block copolymer

Ruiz

Cloutet

Dumon

2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

Nanocellular foaming of polystyrene (PS) and a polystyrene copolymer (PS‐b‐PFDA) with fluorinated block (1,1,2,2‐tetrahydroperfluorodecyl acrylate block, PFDA) was studied in supercritical CO2 (scCO2) via a one‐step foaming batch process. Atom Transfer Radical Polymerization (ATRP) was used to synthesize all the polymers. Neat PS and PS‐b‐PFDA copolymer samples were produced by extrusion and solid thick plaques were shaped in a hot‐press, and then subsequently foamed in a single‐step foaming process using scCO2 to analyze the effect of the addition of the fluorinated block copolymer in the foaming behaviour of neat PS. Samples were saturated under high pressures of CO2 (30 MPa) at low temperatures (e.g., 0°C) followed by a depressurization at a rate of 5 MPa/min. Foamed materials of neat PS and PS‐b‐PFDA copolymer were produced in the same conditions showing that the presence of high CO2‐philic perfluoro blocks, in the form of submicrometric separated domains in the PS matrix, acts as nucleating agents during the foaming process. The preponderance of the fluorinated blocks in the foaming behavior is evidenced, leading to PS‐b‐PFDA nanocellular foams with cell sizes in the order of 100 nm, and bulk densities about 0.7 g/cm3. The use of fluorinated blocks improve drastically the foam morphology, leading to ultramicro cellular and possibly nanocellular foams with a great homogeneity of the porous structure directly related to the dispersion of highly CO2‐philic fluorinated blocks in the PS matrix. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

show abstract

Section: Resultssupporting

confidence: 93%

“…In the range of micro cellular foams, several porous amorphous polymers such as polystyrene, polycarbonate or semicrystalline polymers (polyethylene, polypropylene) have been obtained9–12 via a scCO 2 process.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the nanocellular foaming of polystyrene in supercritical CO₂ by adding a CO₂‐philic perfluorinated block copolymer

Ruiz

Cloutet

Dumon

2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…This yields Δ H a = −8.3 kJ/mol. In contrast to PBMA, PS does not show any shift in FTIR spectra that corresponds to the absence of the acid–base interaction. , The same logic was used to explain the higher swelling of PMMA compared to that of PS . Notably, they have comparable T g values.…”

Section: Resultsmentioning

confidence: 92%

Swelling of Poly(n-butyl methacrylate) Films Exposed to Supercritical Carbon Dioxide: A Comparative Study with Polystyrene

et al. 2016

View full text Add to dashboard Cite

We report here the swelling and relaxation properties of confined poly(n-butyl methacrylate) (PBMA) films having thicknesses of less than 70 nm under supercritical carbon dioxide (scCO2) using the X-ray reflectivity technique. Swellability is found to be dominant in thinner films compared to thicker ones as a consequence of the confinement-induced densification of the former. Swellability is proportionately increased with the density of the film. PBMA films exhibit a more significant swelling than do PS films, and their differences become more prominent with the increase in film thickness. A comparison between the results obtained for polystyrene (PS) and PBMA ultrathin films reveals that the swellability is dependent upon the specific intermolecular interaction between CO2 and the chemical groups available in the polymers. Owing to strong Lewis acid-base interactions with scCO2 and the lower glass-transition temperature (bulk Tg ≈ 29 °C), PBMA films exhibit a greater amount of swelling than do PS films (bulk Tg ≈ 100 °C). Though they reach to the different swollen state upon exposition, identical relaxation behavior as a function of aging time is evidenced. This unprecedented behavior can be ascribed to the strong bonding between trapped CO2 and PBMA that probably impedes the release of CO2 molecules from the swollen PBMA films manifested in suppressed relaxation.

show abstract

“…In contrast to an approach where thin films of nanofoam are obtained from foaming thin polymer films after several hours of saturation with sc-CO 2 [27,28], the saturation time is considerably reduced to seconds due to the enormous surface area of the colloidal crystal-like structures made of nanoparticles [29]. As the polymer nanoparticles are saturated by the sc-blowing agent, their glass transition temperature T g is reduced [30,31]. A temperature increase above the reduced glass transition temperature T g * initiates an inversion of the particles towards a viscous polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Adjustable polystyrene nanoparticle templates for the production of mesoporous foams and ZnO inverse opals

et al. 2020

View full text Add to dashboard Cite

The manifold applications of porous materials, such as in storage, separation, and catalysis, have led to an enormous interest in their cost-efficient preparation. A promising strategy to obtain porous materials with adjustable pore size and morphology is to use templates exhibiting the appropriate nanostructure. In this study, close-packed polystyrene (PS) nanoparticles, synthesized by emulsion polymerization, were used to produce porous PS and ZnO inverse opals. The size and distribution of the polystyrene nanoparticles, characterized by dynamic light scattering (DLS), small-angle neutron scattering (SANS), and scanning electron microscopy (SEM), were controlled via the concentration of sodium dodecyl sulfate (SDS). Systematic measurements of the water/styrene-interfacial tension show that the critical micelle concentration (CMC) of the ternary water–styrene–SDS system, which determines whether monodisperse or polydisperse PS particles are obtained, is considerably lower than that of the binary water–SDS system. The assemblies of close-packed PS nanoparticles obtained via drying were then studied by small-angle X-ray scattering (SAXS) and SEM. Both techniques prove that PS nanoparticles synthesized above the CMC result in a significantly unordered but denser packing of the particles. The polystyrene particles were subsequently used to produce porous polystyrene and ZnO inverse opals. While the former consists of micrometer-sized spherical pores surrounded by extended open-cellular regions of mesopores (Rpore ≈ 25 nm), the latter are made of ZnO-nanoparticles forming a structure of well-aligned interconnected pores.

show abstract

Untitled

Cited by 39 publications

References 15 publications

Investigation of the nanocellular foaming of polystyrene in supercritical CO₂ by adding a CO₂‐philic perfluorinated block copolymer

Investigation of the nanocellular foaming of polystyrene in supercritical CO₂ by adding a CO₂‐philic perfluorinated block copolymer

Swelling of Poly(n-butyl methacrylate) Films Exposed to Supercritical Carbon Dioxide: A Comparative Study with Polystyrene

Adjustable polystyrene nanoparticle templates for the production of mesoporous foams and ZnO inverse opals

Contact Info

Product

Resources

About

Untitled

Cited by 39 publications

References 15 publications

Investigation of the nanocellular foaming of polystyrene in supercritical CO2 by adding a CO2‐philic perfluorinated block copolymer

Investigation of the nanocellular foaming of polystyrene in supercritical CO2 by adding a CO2‐philic perfluorinated block copolymer

Swelling of Poly(n-butyl methacrylate) Films Exposed to Supercritical Carbon Dioxide: A Comparative Study with Polystyrene

Adjustable polystyrene nanoparticle templates for the production of mesoporous foams and ZnO inverse opals

Contact Info

Product

Resources

About

Investigation of the nanocellular foaming of polystyrene in supercritical CO₂ by adding a CO₂‐philic perfluorinated block copolymer

Investigation of the nanocellular foaming of polystyrene in supercritical CO₂ by adding a CO₂‐philic perfluorinated block copolymer