Дисперсность лиофилизированных немодифицированных и модифицированных TEMPО-окисленных нанофибрилл целлюлозы в органических растворителях

Нанофибриллы целлюлозы (TOCNF) шириной 20 ± 6 нм и длиной 809 ± 98 нм были получены с помощью 2,2,6,6-тетраметилпиперидинил-1-оксил (TEMPO)-опосредованного окисления. Для функционализации поверхности TOCNF в водной среде использовали два модифицирующих агента: димер алкилкетена (AKD) и 3-аминопропилтриэтоксисилан (APS). Гидрофильный аэрогель L-TOCNF, гидрофобные аэрогели L-TOCNF-AKD и L-TOCNF-APS с краевыми углами смачивания водой 0, 139 ± 2 и 133 ± 2° соответственно получали лиофильной сушкой водных дисперсий. Элементный состав, морфологию, размеры и кристаллическую структуру определяли с помощью EDX-анализа, сканирующей электронной микроскопии и рентгеноструктурного анализа соответственно. Исследован процесс редиспергирования лиофилизированных образцов в воде и четырех органических растворителях. Выявлено влияние модификации ТОКНФ и полярности растворителя на редиспергируемость лиофилизированных образцов: значительно улучшилась диспергируемость гидрофобных L-TOCNF-AKD и L-TOCNF-AKD в органических растворителях.

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