najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2022-13-6-698-708najo-285Research ArticleСтатьиHigh lignin content cellulose nanofibrils obtained from thermomechanical pulpНанофибриллы целлюлозы с высоким содержанием лигнина, полученные из термомеханической массыhttps://orcid.org/0000-0002-6564-5729ЛугининаА. А.LugininaA. A.ana@lst.gpi.ruhttps://orcid.org/0000-0002-7669-1106КузнецовС. В.KuznetsovS. V.kouznetzovsv@gmail.comhttps://orcid.org/0000-0001-7874-7284АлександровА. А.AlexandrovA. A.alexandrov1996@yandex.ruhttps://orcid.org/0000-0002-5384-4026ГайнутдиновР. В.GainutdinovR. V.rgaynutdinov@gmail.comhttps://orcid.org/0000-0002-0956-5820ПетуховД. И.PetukhovD. I.di.petukhov@gmail.comhttps://orcid.org/0000-0001-5029-8560ВороновВ. В.VoronovV. V.voronov@lst.gpi.ruhttps://orcid.org/0000-0001-7401-5019ЧерноваЕ. В.ChernovaE. V.e-chernova@yandex.ruhttps://orcid.org/0000-0002-2918-3926ФедоровП. П.FedorovP. P.ppfedorov@yandex.ruИнститут общей физики им. А. М. Прохорова Российской академии наукProkhorov General Physics Institute of the Russian Academy of SciencesИнститут кристаллографии имени А. В. Шубникова РАНShubnikov Institute of CrystallographyМосковский государственный университет имени М.В. ЛомоносоваLomonosov Moscow State University202206062025136698708Copyright © Luginina A.A., Kuznetsov S.V., Alexandrov A.A., Gainutdinov R.V., Petukhov D.I., Voronov V.V., Chernova E.V., Fedorov P.P., 20252025Лугинина А.А., Кузнецов С.В., Александров А.А., Гайнутдинов Р.В., Петухов Д.И., Воронов В.В., Чернова Е.В., Федоров П.П.Luginina A.A., Kuznetsov S.V., Alexandrov A.A., Gainutdinov R.V., Petukhov D.I., Voronov V.V., Chernova E.V., Fedorov P.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/285

High-lignin content cellulose nanofibrils (LCNF) were successfully prepared from thermomechanical pulp through TEMPO-catalyzed oxidation, followed by ultrasonic treatment. Preparation protocols of the LCNFs included use of the mild pre-hydrolysis of the thermomechanical pulp and adjustment of sodium hypochlorite loading for the samples with the 23.8 and 14.1 wt.% lignin content, resulting in the increase of the carboxyl group content from 0.70 to 1.24 mmol/g. LCNFs had a diameter of 14 5 nm (AFM evaluation); and the LCNF morphology was affected by contents of both lignin and carboxyl groups. The translucent LCNF films were prepared by solution casting technique. They exhibited the heightened water contact angle of 75-82 °, an increased thermal stability up to 275 °C compared to lignin-free cellulose nanofibril films (39 ° and 203 °C, respectively), and excellent UV-blocking ability in a wide spectrum range from 200 to 375 nm. The said LCNFs can be successfully used for manufacturing the packaging materials and/or making the biopolymer composites.

Нанофибриллы целлюлозы с высоким содержанием лигнина (ЛЦНФ) были успешно получены из термомеханической массы путем ТЕМПО-окисления с последующей ультразвуковой обработкой. Процесс получения ЛЦНФ с содержанием лигнина 23,8 и 14,1 мас.% включал в себя использование мягкого предварительного гидролиза термомеханической массы и регулирование загрузки гипохлорита натрия, что позволило увеличить содержание в них карбоксильных групп с 0,70 до 1,24 ммоль/г. По оценке методом атомно-силовой микроскопии ЛЦНФ имели диаметр 14 ± 5 нм. Морфология ЛЦНФ определялась как содержанием лигнина, так и содержанием карбоксильных групп. Полупрозрачные пленки ЛЦНФ были изготовлены методом литья из раствора. Они показали повышенный краевой угол смачивания водой 75-82°, повышенную термостабильность до 275°С по сравнению с пленками из нанофибрилл ТЕМПО-окисленной чистой целлюлозы 39° и 203°С, соответственно, и превосходную УФ-блокирующую способность в широком диапазоне спектра от 200 до 375 нм. Указанные ЛЦНФ могут быть успешно использованы для изготовления упаковочных материалов и биополимерных композитов.

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