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    Preparation and Characterization of Cellulose Acetate Propionate Films Functionalized with Reactive Ionic Liquids

    Year: 2019

    Journal: Polymers, Volume 11, JUL

    Authors: Kujawa, Joanna; Rynkowska, Edyta; Fatyeyeva, Kateryna; Knozowska, Katarzyna; Wolan, Andrzej; Dzieszkowski, Krzysztof; Li, Guoqiang; Kujawski, Wojciech

    Organizations: Polish National Science Centre [2015/18/M/ST5/00635]; Hubert Curien's Partnership Program "Polonium [35501/2016]; French Government; French Embassy in Poland [848642E, 878205J, 912422E]

    Keywords: polymer membranes; cellulose acetate propionate; reactive ionic liquid; transesterification reaction; material characterization; water transport

    1-(1,3-diethoxy-1,3-dioxopropan-2-ylo)-3-methylimidazolium bromide (RIL1_ Br), 1-(2-etoxy-2 -oxoethyl)-3-methylimidazolium bromide (RIL2_ Br), 1-(2-etoxy-2-oxoethyl)-3 -methylimidazolium tetrafluoroborate (RIL3_ BF4) ionic liquids were synthesized. Subsequently, the dense cellulose acetate propionate (CAP)-based materials containing from 9 to 28.6 wt % of these reactive ionic liquids were elaborated. Reactive ionic liquids (RILs) were immobilized in CAP as a result of the transesterification reaction. The yield of this reaction was over 90% with respect to the used RIL. The physicochemical properties of resultant films were studied using nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), atomic force microscopy (AFM), and thermogravimetric analysis (TGA). The RIL incorporation influenced the morphology of films by increasing their surface roughness with the rise of RIL content. The thermal stability of CAP-based membranes was dependent on the nature of the ionic liquid. Nevertheless, it was proven that CAP films containing RILs were stable up to 120-150 ffi C. Transport properties were characterized by water permeation tests. It was found that the type and the amount of the ionic liquid in the CAP matrix substantially influenced the transport properties of the prepared hybrid materials.
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