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    Nanofibrous, porous monoliths formed from gelating high internal phase emulsions using syndiotactic polystyrene

    Year: 2020

    Journal: Polymer, Volume 202, AUG 12

    Authors: Gui, Haoguan; Zhang, Tao; Ji, Sha; Guan, Guangwu; Guo, Qipeng

    Organizations: Deakin University Postgraduate Research Scholarship (DUPRS); Natural Science Foundation of Jiangsu ProvinceNatural Science Foundation of Jiangsu Province [BK20180847]

    Keywords: High internal phase emulsion; Nanofiber; Absorption

    Gelating high internal phase emulsions (HIPEs) is critical for the preparation of emulsion-templated porous polymers, and the gelation is conventionally realized through chemical crosslinking of monomers or through physical interaction of a HIPE stabilizer. Here, we present a new method to gelate HIPEs and to fabricate emulsion-templated porous monoliths by incorporating a gelating polymer, syndiotactic polystyrene (sPS), into the continuous phase of an HIPE, without using any chemical crosslinker or any gelating stabilizer. The emulsiontemplated sPSs exhibited controllable shapes, nanofibers (with average diameters of around 24 nm) on void walls, emulsion-templated macropores, and windows in two different scales (interconnecting pores from emulsion-templating and interconnecting pores among nanofibers), robust mechanical property (without failure even at a high compressive strain of 70%) and large surface areas (up to 325 m(2) g(-1)), facilitating rapid absorption of airborne volatile organic compounds. After absorption, the porous sPSs could be easily regenerated under vacuum. Therefore, the porous monoliths can be excellent candidates for removal of airborne volatile organic compounds.
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