Chemically induced phase separation: a new technique for the synthesis of macroporous epoxy networks

Kiefer, J.; Hilborn, Jöns; Hedrick, James L.

doi:10.1016/s0032-3861(96)00436-3

Cited by 67 publications

(66 citation statements)

References 41 publications

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“…Regarding phase separation techniques, phase separation can be produced during polymerization and cross-linking in different ways: (1) by the addition of a non-solvent to a polymer/solvent mixture (immersion techniques) [22,23], (2) by chemical induction (i.e., the polymerization is performed in a monomer/non-solvent mixture, the polymerization itself depletes the monomer, and insolubility is induced) [24], and (3) by thermal induction phase separation (TIPS) [25,26]. For the latter, three different mechanisms can be distinguished: spinodal decomposition (liquid-liquid phase separation), physical gelation, crystallization (solid-liquid phase separation), or combinations of these.…”

Section: Fabrication Processmentioning

confidence: 99%

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Nanoporous polymeric materials: A new class of materials with enhanced properties

Notario

Pinto

Rodríguez‐Pérez

2016

Progress in Materials Science

181

125

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a b s t r a c tNanoporous polymeric materials are porous materials with pore sizes in the nanometer range (i.e., below 200 nm), processed as bulk or film materials, and from a wide set of polymers. Over the last several years, research and development on these novel materials have progressed significantly, because it is believed that the reduction of the pore size to the nanometer range could strongly influence some of the properties of porous polymers, providing unexpected and improved properties compared to conventional porous and microporous polymers and non-porous solids.In this review, the key properties of these nanoporous polymeric materials (mechanical, thermal, dielectric, optical, filtration, sensing, etc.) are analyzed. The experimental and theoretical results obtained up to date related to the structure-property relations are presented. In several sections, in order to present a more compressive approach, the trends obtained for nanoporous polymers are compared to those for metallic and ceramic nanoporous systems. Moreover, some specific characteristics of these materials, such as the consequences of the confinement of both gas and solid phases, are described. Likewise, the main production methods are briefly described. Finally, some of the potential applications of these materials are also discussed in this paper.

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Section: Fabrication Processmentioning

confidence: 99%

“…Upon a thermal treatment or chemical attack with solvents the unstable block is removed, leaving pores where the size and shape are dictated by the initial copolymer morphology [19,24,35].…”

Section: Fabrication Processmentioning

confidence: 99%

Nanoporous polymeric materials: A new class of materials with enhanced properties

Notario

Pinto

Rodríguez‐Pérez

2016

Progress in Materials Science

181

125

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“…Thermodynamics is the driving force for RIPS, but diffusion kinetics between phases is the controlling factor from the gel point on (Kiefer et al, 1996;Rajagopalan et al, 2000).…”

Section: Epoxy Blends Reaction Induced Phase Separationmentioning

confidence: 99%

Infrared Spectroscopy - Materials Science, Engineering and Technology

2012

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“…24 -27 Epoxy and cyanate systems with well-defined porosity have been produced after extraction of the separated substance (low molecular weight liquids can be extracted by drying for example). [28][29][30][31] This substance is, in such cases, often referred to as a porogen, as it will template the final porosity.…”

Section: Introductionmentioning

confidence: 99%

Gradient porosity poly(dicyclopentadiene)

Martina

Hilborn

2001

J. Mater. Res.

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This article describes the preparation of gradient porosity thermoset polymers. The technique used is based on polymerizing a solution of cross-linkable dicyclopentadiene and 2-propanol. The forming polymer being insoluble in 2-propanol, phase separation occurs. Subsequent drying of the 2-propanol gives porosities up to 80%. An apparatus was built to produce a gradient in 2-propanol concentration in a flask, resulting in polymerized gradient porosity rods. The resulting materials have been characterized by scanning electron microscopy (SEM) and density measurements. A mathematical model which allows prediction of the gradient produced is also presented.

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Chemically induced phase separation: a new technique for the synthesis of macroporous epoxy networks

Cited by 67 publications

References 41 publications

Nanoporous polymeric materials: A new class of materials with enhanced properties

Nanoporous polymeric materials: A new class of materials with enhanced properties

Infrared Spectroscopy - Materials Science, Engineering and Technology

Gradient porosity poly(dicyclopentadiene)

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