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Aerogels of Hierarchically Porous Syndiotactic Polystyrene with Dielectric Constant Near to Air

Abstract

Herein ultralow density aerogels were developed through a feasible freeze casting technique. Briefly, the syndiotactic polystyrene (sPS) gel was prepared using xylene and subjected to successive steps of solvent exchange using non-solvents like ethanol and water. These samples were freeze-dried to obtain the aerogels of same shape and size as that of gels. Aerogels, so obtained were exhibited lowest ever dielectric constant for any polymer aerogel (κ=1.03±0.02), which is very close to that of air. Moreover, while analyzing the crystal structure, it was observed that the water derived sPS aerogel existed in the empty δ (δe) form, with microcavities in the crystal lattice in addition to meso and macroporosity. However, annealing at different temperatures yielded aerogels with different polymorphic forms without microporosity leading to slight variations in the dielectric constant. The microporosity in the crystalline state along with the lower density of the material are proved to be the major contributing factors for the lowest ever reported dielectric constant of sPS aerogel. The sPS aerogels with ultra low dielectric constant, very high hydrophobicity and adequate mechanical strength can stand as an alternative to conventional brittle inorganic aerogels.

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Publication details

The article was received on 08 Nov 2017, accepted on 01 Dec 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC05102F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Aerogels of Hierarchically Porous Syndiotactic Polystyrene with Dielectric Constant Near to Air

    A. M. Joseph, N. Baku, S. P, K. P. Surendran and B. Gowd, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC05102F

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