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Polymer Foams (polymer + foam)

Distribution by Scientific Domains
Polymers and Materials Science85%

Selected Abstracts

Nanocomposite Foams: Conducting Nanocomposite Polymer Foams from Ice-Crystal-Templated Assembly of Mixtures of Colloids (Adv. Mater.

ADVANCED MATERIALS, Issue 28 2009
28/2009)
The cover shows an electron microscopy image of a nanocomposite "soft" polymer foam reinforced with armored cell walls of "hard" nanoparticles obtained by freeze-drying a mixture of colloids dispersed in water. On p. 2894 Stefan Bon and co-workers demonstrate the versatility of their ice-crystal templating assembly strategy by fabricating a gas sensor from a "soft" polymer latex, silica nanoparticles, and colloidal carbon black. [source]

Conducting Nanocomposite Polymer Foams from Ice-Crystal-Templated Assembly of Mixtures of Colloids

ADVANCED MATERIALS, Issue 28 2009
Catheline A. L. Colard
Fabrication of conducting nanocomposite- reinforced soft polymer foams is demonstrated. These multicomponent cellular materials are built from a mixture of colloids dispersed in water by freeze,drying, thereby using ice crystals as template for the porous structure. An excluded-volume effect armors the "soft"-polymer cell walls with "hard" nanoparticles, thereby enhancing the mechanical robustness of the foams. [source]

Polymer Foams Stabilized by Particles Adsorbed at the Air/Polymer Interface

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 15 2008
Prachi Thareja
Abstract In aqueous systems, partially hydrophobic particles are known to stabilize foams even in the absence of any added surfactant. This paper shows that the same principle can be applied to polymeric systems: particles that are partially wetted by a polymer melt can stabilize a foam of that polymer. The foam stability is attributable to the adsorption of the particles at the air/polymer interface. Remarkably, stable foams are realized even from polymers that are liquid at room temperature, and hence are otherwise unfoamable. The implications of this result to practical foaming operations are discussed. [source]

Nanocomposite Foams: Conducting Nanocomposite Polymer Foams from Ice-Crystal-Templated Assembly of Mixtures of Colloids (Adv. Mater.

ADVANCED MATERIALS, Issue 28 2009
28/2009)
The cover shows an electron microscopy image of a nanocomposite "soft" polymer foam reinforced with armored cell walls of "hard" nanoparticles obtained by freeze-drying a mixture of colloids dispersed in water. On p. 2894 Stefan Bon and co-workers demonstrate the versatility of their ice-crystal templating assembly strategy by fabricating a gas sensor from a "soft" polymer latex, silica nanoparticles, and colloidal carbon black. [source]

Thermoreversible Poly(vinylidene fluoride) Gels: A Precursor to Multiporous Polymeric Materials

MACROMOLECULAR SYMPOSIA, Issue 1 2008
D. Dasgupta
Abstract Summary: The thermodynamics of gelation of poly(vinylidene fluoride)(PVF2) with camphor (CP) and ethylene carbonate (EC) suggest polymer-solvent compound formation. The presence of solvent molecules in the polymer crystalline phase of the gel is accordingly shown by wide angle X-ray diffraction studies. The dried gels exhibit porous network morphology. Thermoreversible gel of PVF2 in diethyl azelate is also exploited to create multiporous polymer foam. Porosity measurements with the dried PVF2 gels using Mercury intrusion porosimetry and nitrogen sorption ensure the presence of macro and mesopores in the same matrix although the mesoporosity in dried PVF2 -CP gels strongly depend on method of drying. [source]

Conducting Nanocomposite Polymer Foams from Ice-Crystal-Templated Assembly of Mixtures of Colloids

ADVANCED MATERIALS, Issue 28 2009
Catheline A. L. Colard
Fabrication of conducting nanocomposite- reinforced soft polymer foams is demonstrated. These multicomponent cellular materials are built from a mixture of colloids dispersed in water by freeze,drying, thereby using ice crystals as template for the porous structure. An excluded-volume effect armors the "soft"-polymer cell walls with "hard" nanoparticles, thereby enhancing the mechanical robustness of the foams. [source]

Aqueous Foams: A Field of Investigation at the Frontier Between Chemistry and Physics

CHEMPHYSCHEM, Issue 4 2008
Dominique Langevin Dr.
Abstract This paper reviews the properties of aqueous foams. The current state of knowledge is summarized briefly and the interdisciplinary aspects of this field of investigation are emphasized. Many phenomena are controlled by physical laws, but they are highly dependent upon the chemicals used as foam stabilizers: surfactants, polymers, particles. Most of the existing work is related to surfactants and polymer foams, and little is known yet for particle foams although research in this field is becoming popular. This article presents the general concepts used to describe the monolayers and the films and also some of the recent advances being made in this area. [source]