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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.8b01513
|2 doi
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|a eng
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| 100 |
1 |
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|a Teo, Nicholas
|e verfasserin
|4 aut
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| 245 |
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|a Solvent Effects on Tuning Pore Structures in Polyimide Aerogels
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|c 2018
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 26.09.2018
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|a Date Revised 26.09.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a This work evaluates the effects of solvents and a block copolymer surfactant on pore structures in polyimide aerogels synthesized via sol-gel reaction process. Specifically, cross-linked polyimide gel networks are synthesized in single or mixed solvents from a combination of dimethylformamide, N-methylpyrrolidone, and dimethylacetamide and supercritically dried to obtain aerogels. The bulk density, pore size, and mechanical properties of aerogels are determined. The results show that gel times are strongly dependent on the electron acceptance ability of the solvent system and concentration of the surfactant. At longer gel times, the polyimide strands coarsen and the pores in aerogel shift from predominantly mesoporous to macroporous state with corresponding reduction in compressive modulus. The block copolymer surfactant also slows down gelation and coarsens the polyimide strands but only weakly affects the compressive modulus of the aerogels
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|a Journal Article
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|a Jana, Sadhan C
|e verfasserin
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 34(2018), 29 vom: 24. Juli, Seite 8581-8590
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|g volume:34
|g year:2018
|g number:29
|g day:24
|g month:07
|g pages:8581-8590
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|u http://dx.doi.org/10.1021/acs.langmuir.8b01513
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