Rheological effect of the concentration of nanoparticles in cassava starch
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.26
Rheological effect of the concentration of nanoparticles in cassava starch César de Jesús Alarcón-Hernández1, Esteban A. González-García1, Luis Medina-Torres2, Patricio Morales-Pacheco1 1 Ingeniería en Nanotecnología, Instituto Tecnológico Superior de Poza Rica (ITSPR), Cd. Poza Rica, Veracruz (93230) México
2
Departamento de farmacia, Universidad Nacional Autónoma de México (UNAM), Cd. Universitaria, Coyoacán, México D.F. (04510) México
ABSTRACT
Biodegradable material was prepared from cassava starch in combination with zinc oxide nanoparticles (ZnO NPs) to give the properties of microbial growth resistance, glycerin concentrations were varied to 5%, 10%, and 20% (w/v) for the study of the rheological properties. The nanoparticles were characterized by a spectrophotometer where an exciton peak at 370 nm was obtained. The different samples were subjected to a thermomechanical study through an AR-G2 hybrid rheometer, using a parallel plane geometry of 20 mm, a weak gel behavior is observed, it is a slimming material and it is thermostable, it is also established that the zinc oxide concentration nanoparticles do not affect the mechanical behavior of the material.
INTRODUCTION Plastics consumption is increasing, they are used to manufacture and wrap many of the products we buy and consume. The problem begins when we already occupy them, this happens especially with disposable plastic. Plastic is used because it is easy and cheap to manufacture and has a long life. Unfortunately, these same advantages are those that make it one of the main problems of pollution because its low cost makes one quickly get rid of them and its long existence makes it last in the environment for many years in which it can cause large damage since its degradation is slow, in addition, that they are mostly plastics from petroleum, and depends on non-renewable resources for its production [1]. Given this, there is a need and concern for the conservation of the
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environment by conducting research on biodegradable polymers based on renewable resources of natural origin [2]. Bioplastics are currently a field of growing interest in industrial sectors because biodegradable plastic waste can be treated as organic waste and disposed of in sanitary warehouses and all natural carbon-based polymers, such as starch, cellulose, lignin, are very abundant and renewable, in addition, the monomers on which they are based are biodegradable [3,1]. Properties such as the mechanical strength and flexibility of the starch are important due to the intended use of the material; these depend on the ratio of amylose and amylopectin, whose molecules contain glycosidic bonds (see Figure 1). The molecular weight of the amylose is about one million g/mol, and that of am
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