Formation of porous epoxy monolith via concentrated emulsion polymerization

Wang, Jianli; Zhang, Chen; Du, Zhongjie; Xiang, Aiming; Li, Hangquan

doi:10.1016/j.jcis.2008.06.012

Cited by 24 publications

(14 citation statements)

References 18 publications

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“…System A appears to contain minimal phase separation such that the epoxy network is continuously plasticized over most electrolyte concentrations. For System B, the 26% PEG sample appears homogenous, while above 45% PEG the porous epoxy microstructure suggests excess PEG has phase separated, with higher PEG content leading to a connected‐sphere morphology typically of liquid‐rich phase separated systems . These observations indicate that the PEG has limited miscibility with the epoxy monomer or resulting network.…”

Section: Discussionmentioning

confidence: 99%

“…We present here a new approach towards developing structural electrolytes in which formation of the structure and introduction of the electrolyte are done in sequence to better optimize each material. We use polyethylene glycol (PEG) as a porogen to generate an epoxy foam, then remove the PEG and backfill the voids with a more conductive propylene carbonate (PC) based electrolyte. Compared with previous approaches, this methodology allows for the microstructure to be tailored independently from liquid electrolyte selection, which greatly widens the range of materials, processing conditions, and microstructures that can be tailored to achieve optimal final properties.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and multifunctional properties of liquid + polymer bicomponent structural electrolytes: Epoxy gels and porous monoliths

Gienger

Nguyen

Chin

et al. 2015

J of Applied Polymer Sci

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Multifunctional structural batteries and supercapacitors have the potential to improve performance and efficiency in advanced lightweight systems. A critical requirement is a structural electrolyte with superior multifunctional performance. We present here structural electrolytes prepared by the integration of liquid electrolytes with structural epoxy networks. Two distinct approaches were investigated: direct blending of an epoxy resin with a poly(ethylene-glycol) (PEG)-or propylene carbonate (PC)-based liquid electrolyte followed by in-situ cure of the resin; and formation of a porous neat epoxy sample followed by backfill with a PC-based electrolyte. The results show that in situ cure of the electrolytes within the epoxy network does not lead to good multifunctional performance due to a combination of plasticization of the structural network and limited percolation of the liquid network. In contrast, addition of a liquid electrolyte to a porous monolith results in both good stiffness and high ionic conductivity that approach multifunctional goals.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and multifunctional properties of liquid + polymer bicomponent structural electrolytes: Epoxy gels and porous monoliths

Gienger

Nguyen

Chin

et al. 2015

J of Applied Polymer Sci

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“…The high‐diffusion constant of the gas precludes the control of the pore size, and foams with high porosities are usually obtained. The second technique is termed as “concentrated emulsion”7, 8 or “high internal phase emulsion”,9, 10 usually used for the synthesis of organic and inorganic foams. The system mainly includes a continuous or outer phase, a dispersed or inner phase and a surfactant that ensures the miscibility between the continuous and dispersed phase.…”

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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“…Although step polymerization was reported by a few authors [18,19], the curing of an epoxy system in a concentrated emulsion was first put forward by Wang et al [20]. In the present study, glycidyl amino epoxy (GAE) monomers were introduced to the concentrated emulsion successfully.…”

Section: Introductionmentioning

confidence: 81%

Formation of porous epoxy monolith via concentrated emulsion polymerization

Cited by 24 publications

References 18 publications

Microstructure and multifunctional properties of liquid + polymer bicomponent structural electrolytes: Epoxy gels and porous monoliths

Microstructure and multifunctional properties of liquid + polymer bicomponent structural electrolytes: Epoxy gels and porous monoliths

Chemically induced phase separation in the preparation of porous epoxy monolith

Interconnected porous epoxy monoliths prepared by concentrated emulsion templating

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