Evaluation of reaction factors for deposition of silica (SiO2) nanoparticles on cellulose fibers

• Published in: Carbohydrate polymers 2014-12, Vol.114, p.424-431
• Main Authors: Raabe, Joabel, de Souza Fonseca, Alessandra, Bufalino, Lina, Ribeiro, Caue, Martins, Maria Alice, Marconcini, José Manoel, Tonoli, Gustavo Henrique Denzin
• Format: Article
• Language: English
• Subjects: Applied sciences; Cellulose treatment; Exact sciences and technology; Fibers and threads; Forms of application and semi-finished materials; Hybrid nanocomposites; Moisture adsorption; Polymer industry, paints, wood; Technology of polymers; Vegetable fibers
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2014.08.042

•SiO2 nanoparticles were deposited on the surface of cellulose fibers.•Chemical interaction between SiO2 nanoparticles and cellulose fibers was achieved.•SiO2 modification improved thermal properties of the cellulose fibers.•Moisture adsorption of the modified fibers decreased up to 50%. This study aimed to evaluate reaction conditions for deposition of SiO2 nanoparticles on the surface of cellulose fibers and their influence on moisture adsorption of the hybrid organic–inorganic material formed. SiO2 nanoparticle deposition was carried out with the sol–gel process testing four reaction times (2, 12, 18, and 24h) and three contents of the tetraethyl-orthosilicate (TEOS) precursor (1.9, 4.2 and 8.4gg−1 of cellulose fiber). Modification time and TEOS content directly influence the amount of Si deposited on the fiber surface, nanoparticle diameter distribution, thermal stability, and resistance to moisture adsorption. There is a tendency of slight increase of nanoparticle size and the amount of Si deposited with increasing reaction time. SiO2 nanoparticles were bonded on the surface of the cellulose fibers and are able to improve thermal stability of the material, increasing onset degradation temperature. The moisture adsorption capacity of the modified cellulose fiber was reduced up to 50%.