Nanocomposites based on banana starch reinforced with cellulose nanofibers isolated from banana peels

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:505

Article

Pelissari, Franciele Maria¹  Andrade-Mahecha, Margarita Maria²  do Amaral Sobral, Paulo Jose³  Menegalli, Florencia Cecilia⁴ 

[1] Univ Jequitinhonha & Mucuri, Inst Sci & Technol, Food Engn, BR-39100000 Diamantina, MG, Brazil

[2] Univ Nacl Colombia, Dept Ingn, Cra 32 12-00 Chapinero, Palmira, Valle Del Cauca, Colombia

[3] Univ Estadual Campinas, Sch Food Engn, Dept Food Engn, BR-13083862 Campinas, SP, Brazil

[4] Univ Sao Paulo, Sch Anim Sci & Food Engn, Dept Food Engn, BR-13635900 Pirassununga, SP, Brazil

关键词: Banana starch;    Cellulose nanofibers;    High-pressure homogenizer;    Biodegradable films;    Mechanical properties;   

DOI  :  10.1016/j.jcis.2017.05.106

来源: Elsevier

【 摘 要 】

Cellulose nanofibers were isolated from banana peel using a combination of chemical and mechanical treatments with different number of passages through the high-pressure homogenizer (0, 3, 5, and 7 passages). New nanocomposites were then prepared from a mixed suspension of banana starch and cellulose nanofibers using the casting method and the effect of the addition of these nanofibers on the properties of the resulting nanocomposites was investigated. The cellulose nanofibers homogeneously dispersed in the starch matrix increased the glass transition temperature, due to the strong intermolecular interactions occurring between the starch and cellulose. The nanocomposites exhibited significantly increased the tensile strength, Young's modulus, water-resistance, opacity, and crystallinity as the number of passages through the homogenizer augmented. However, a more drastic mechanical treatment (seven passages) caused defects in nanofibers, deteriorating the nanocomposite properties. The most suitable mechanical treatment condition for the preparation of cellulose nanofibers and the corresponding nanocomposite was five passages through the high-pressure homogenizer. In general, the cellulose nanofibers improved the features of the starch-based material and are potentially applicable as reinforcing elements in a variety of polymer composites. (c) 2017 Elsevier Inc. All rights reserved.

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