Pore size modification of macroporous crosslinked poly(dicyclopentadiene)

Martina, Alberto Della; Garamszegi, László Zsolt; Hilborn, Jöns

doi:10.1002/pola.10749

Cited by 19 publications

(26 citation statements)

References 27 publications

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“…The same procedure could also be used onto templates prepared via different techniques in order to produce ultraporous structures with various morphologies. [31] In addition, a wide range of polymers can be assembled onto the template, providing the path to a variety of potential uses including biomedical, chromatography, catalysis, and electronic applications.…”

Section: Mass Increase (%)mentioning

confidence: 99%

Ultraporous Nanosheath Materials by Layer‐by‐Layer Deposition onto Co‐continuous Polymer‐Blend Templates

2006

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Porous polymer materials with interconnected porosity have recently received great attention due to their wide range of possible applications and the challenges they pose in preparation. Their potential applications range from use in the biomedical and pharmaceutical fields (tissue engineering and drug delivery) [1][2][3] to chromatographic materials, [4] to catalysis of chemical and biochemical reactions, [5] and to electronic devices.[6] For tissue-engineering applications, for instance, at least four different techniques for fabricating interconnected porous polymer substrates have been developed: fiber bonding of unwoven meshes, [7] solvent casting/particulate leaching, [8] gas foaming, [9] and phase separation.[10] However, every one of these approaches suffers from severe limitations including low levels of interconnectivity, low void volume, poor control of pore size and distribution, and difficulties in obtaining materials of reproducible porosities. Previously, we advanced an approach to preparing microporous materials based on the melt-blending of two immiscible polymers [11] and demonstrated that selective extraction of one of two components in a co-continuous mixture can result in a single-component structure of fully interconnected porosity with highly controlled porosity, morphology, and pore diameters ranging from 100 nm to hundreds of micrometers. [12,13] However, this method was found to be limited in the void volume that can be attained, and able to be used to prepare only relatively low-void-volume substrates (75 %). Layer-by-layer (LbL) deposition is a simple and effective approach to deposit ultrathin and uniform molecular layers onto surfaces in which polyelectrolytes are adsorbed on an oppositely charged surface, reversing the surface charge and leaving it primed for the next deposition cycle. [14][15][16] Originally exclusively investigated on macroscopically flat surfaces, this technique has been recently used to fabricate hollow spheres by assembling multilayered films onto colloidal particles and subsequently removing the core.[17] Hollow micro-and nanoparticles have also been prepared by removing the core of different crosslinked polymer brush surface-modified particles. [18,19] Macromolecular self-assembly techniques such as block-copolymer templates have already been used to prepare porous materials, [20,21] but to date no work has been reported on the use of LbL techniques to create 3D fully interconnected substrates.Here we report the use of LbL deposition onto a porous co-continuous blend template as a novel route towards ultrahigh-void-volume materials of high internal surface and closely controlled pore size. As an illustrative case, we selected bovine serum albumin (BSA) as a bioactive compound to be incorporated in the protocol. The present process is shown in Figure 1.First, co-continuous poly(L-lactic acid)/poly(e-caprolactone) (PLLA/PCL 50:50 wt.-%) blends are produced via melt-processing. In order to demonstrate the preparation of materials of different pore sizes, two pre...

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Section: Mass Increase (%)mentioning

confidence: 99%

Ultraporous Nanosheath Materials by Layer‐by‐Layer Deposition onto Co‐continuous Polymer‐Blend Templates

2006

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“…Recently, open porosity, macroporous crosslinked poly(dicyclopentadiene) (PDCPD) has been produced via chemically induced phase separation (CIPS) [1][2][3]. These materials could serve as bases for applications such as membranes, ion-exchange and chromatographic media, solid support resins, carriers, catalysts or adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Surface functionalization of cross-linked poly(dicyclopentadiene)

Martina

Garamszegi

Hilborn

2003

Reactive and Functional Polymers

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“…Kiefer et al12–14 had first proposed an improved method for the preparation of porous epoxy network via polymerization‐induced phase separation in 1996, also termed as chemically induced phase separation (CIPS), or reaction‐induced phase separation. This method can also be used to prepare porous thermosetting polymers such as cyanurate13 or dicyclopentadiene thermosets 15, 16. The initial system consists of polymeric precursors and a low‐molecular weight liquid having a low boiling point,14, 17 which will form a second phase on the formation of a cross‐linked network.…”

Section: Introductionmentioning

confidence: 99%

Chemically induced phase separation in the preparation of porous epoxy monolith

et al. 2010

J Polym Sci B Polym Phys

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A methodology for preparing porous epoxy monolith via chemically induced phase separation was proposed. The starting system was a mixture of an epoxy precursor, diglycidyl ether of bisphenol‐A (DGEBA), a curing agent, 4,4′‐diaminodiphenylmethane (DDM), and a thermoplastic polymer, polypropylene carbonate (PPC). As DGEBA was cured with DDM, the system became phase‐separated having PPC particles dispersed in epoxy matrix. After PPC particles were removed by thermal degradation, a porous structure was obtained. The phase separation mechanism was determined by the initial composition and illustrated by a pseudophase diagram. The pore size increased with increasing the concentration of PPC and raising the curing temperature. The intermediate and final morphologies of the system were studied using optical and scanning electron microscopy, respectively. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2010

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Pore size modification of macroporous crosslinked poly(dicyclopentadiene)

Cited by 19 publications

References 27 publications

Ultraporous Nanosheath Materials by Layer‐by‐Layer Deposition onto Co‐continuous Polymer‐Blend Templates

Ultraporous Nanosheath Materials by Layer‐by‐Layer Deposition onto Co‐continuous Polymer‐Blend Templates

Surface functionalization of cross-linked poly(dicyclopentadiene)

Chemically induced phase separation in the preparation of porous epoxy monolith

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