Templating effects in dye-containing polypyrrole-gelatin cryogels

0559885 - ÚMCH 2023 RIV CH eng J - Článek v odborném periodiku
Milakin, Konstantin A. - Morávková, Zuzana - Acharya, Udit - Lhotka, M. - Hlídková, Helena - Hodan, Jiří - Bober, Patrycja
Templating effects in dye-containing polypyrrole-gelatin cryogels.
Materials Chemistry and Physics. Roč. 290, 15 October (2022), č. článku 126596. ISSN 0254-0584. E-ISSN 1879-3312
Grant CEP: GA ČR(CZ) GA21-01401S
Institucionální podpora: RVO:61389013
Klíčová slova: polypyrrole * gelatin * cryogel
Obor OECD: Polymer science
Impakt faktor: 4.6, rok: 2022
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0254058422009026

Polypyrrole-gelatin cryogels were prepared by cryopolymerization in the presence of safranin, methyl orange and Acid Blue 25 dyes. The macroporous morphology (pore size <55 μm) of the obtained materials was not affected by the introduction of the dyes. The used dyes are known to form templates and change polypyrrole morphology in similar polymerization conditions without gelatin. However, optical microscopy showed that the anionic dyes (Acid Blue 25 and methyl orange) did not precipitate and form morphology-guiding templates after addition of iron(III) chloride in the presence of gelatin. In contrast, the template-forming behavior of the cationic dye (safranin) was found to be preserved. Starting from 0.5 mol% of safranin (compared to the monomer) in the polymerization medium, the safranin templates were presumably incorporated into pore walls of the cryogels, reinforcing them, and increasing tensile modulus by ≈ 6 times (up to ≈400 kPa) compared to the cryogel without a dye. According to TGA, introduction of the dyes to the polypyrrole-gelatin aerogels resulted in decrease of their thermal stability. Molecular structure of the aerogels was studied by vibrational spectroscopy. The aerogel prepared in the presence of Acid Blue 25 had the highest conductivity (10.4 S cm−1) and specific surface area (37.5 m2 g−1) as well as porosity (95.1%) and pore volume (13 cm3 g−1). In general, incorporation of the dyes resulted in higher specific surface area (up to ≈10 times) of the materials, compared to the cryogels without a dye. Therefore, the preparation of polypyrrole-gelatin cryogels/aerogels in the presence of the dyes can be a promising approach for enhancement of their properties.
Trvalý link: https://hdl.handle.net/11104/0333435