Egon Petersohn Junior, Angelo Cezar Lucizani, Victor Veríssimo, Cassiano Pires, Alan Sulato de Andrade, Mailson de Matos, Gisele Perissutti, Washington Luiz Esteves Magalhaes, Rilton Alves de Freitas
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引用次数: 0
Abstract
Microfibrillated cellulose (MFC) and hydroxypropyl methylcellulose (HPMC) were employed as gelling agents in hydroalcoholic solutions. However, a limited number of studies have explored the interactions between MFC and cellulose derivatives in organic solvents. Most of these studies have primarily focused on either the interactions between MFC and polymers in aqueous solutions. To investigate their collaborative effect, phase diagrams were constructed by varying the concentration of the constituent elements, confirming phase separation, and identifying liquid-like and gel-like properties through oscillatory rheological measurements. Oscillatory amplitude, frequency, oscillatory swing temperature and viscosity were performed. Additionally, aerogels were fabricated with and without ethanol for microscopic analysis. It was demonstrated that ethanol significantly influences the rheological characteristics of MFC and MFC + HPMC dispersions, resulting in an increase in the elastic modulus (G'), decreased thixotropic behavior, and increased stability. Tests were also conducted with urea, a strongly chaotropic agent, providing evidence of the types of interactions governing the systems, and demonstrating that intermolecular hydrogen bond interactions play a predominant role.
期刊介绍:
Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.