Effect of exfoliating agent on rheological behavior of β-chitin fibrils in aqueous suspensions and on mechanical properties of poly(acrylic acid)/β-chitin composites.

Autor: Bogdanova OI; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia; Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, Profsoyuznaya ul. 70, 117393 Moscow, Russia. Electronic address: pishi.olge@gmail.com., Istomina AP; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia; Moscow Technological University, Vernadsky pr. 78, 119454 Moscow, Russia., Glushkova NA; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia; Moscow Institute of Physics and Technology, Institutskiy per. 9, 141701 Dolgoprudny, Moscow Region, Russia. Electronic address: natalya.glushkova@phystech.edu., Belousov SI; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia., Kuznetsov NM; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia., Polyakov DK; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia., Malakhov SN; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia., Krasheninnikov SV; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia., Bakirov AV; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia; Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, Profsoyuznaya ul. 70, 117393 Moscow, Russia., Kamyshinsky RA; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia; Moscow Institute of Physics and Technology, Institutskiy per. 9, 141701 Dolgoprudny, Moscow Region, Russia; Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky pr. 59, 119333 Moscow, Russia., Vasiliev AL; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia; Moscow Institute of Physics and Technology, Institutskiy per. 9, 141701 Dolgoprudny, Moscow Region, Russia; Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky pr. 59, 119333 Moscow, Russia., Streltsov DR; Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, Profsoyuznaya ul. 70, 117393 Moscow, Russia; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia., Chvalun SN; National Research Center 'Kurchatov Institute', Akademika Kurchatova pl. 1, 123182 Moscow, Russia; Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, Profsoyuznaya ul. 70, 117393 Moscow, Russia.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2019 Oct 15; Vol. 139, pp. 161-169. Date of Electronic Publication: 2019 Jul 29.
DOI: 10.1016/j.ijbiomac.2019.07.194
Abstrakt: Chitin whiskers are promising reinforcing filler for composites due to their mechanical properties, renewable nature and low cost. A new method for preparation of β-chitin fibrils from squid pens in ascorbic acid aqueous solutions (AscA) was developed. Stirring of the solution with 2 g/l AscA for 2 h disperses the swollen chitin to individualized fibrils with an aspect ratio > 250. The optimal conditions of β-chitin exfoliation in acrylic acid (AcrA) aqueous solution were found (0.75-2 g/l, 3-4 h). TEMPO-oxidized β-chitin fibrils were chosen as a reference sample for comparison of different methods. 0.1% chitin suspensions exfoliated in AscA and AcrA solutions show similar gel-like behavior with a storage modulus (G') of 98 ± 23 and 34 ± 12 Pa, respectively, whereas G' of 0.1% dispersion of the TEMPO-oxidized β-chitin fibrils was 0.015 ± 0.005 Pa only. Composites based on poly(acrylic acid) comprising 1-3 wt% of β-chitin fibrils were fabricated by polymerization filling. Mechanical properties of the composites were investigated in dry state in the temperature range of 25-250 °C and at controlled relative humidity in the range from 53.6% to 100%. It was revealed that the maximum reinforcing effect is achieved at high temperature (>120 °C) and high relative humidity (≥75.3%RH).
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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