Effect of Montmorillonite K10 clay as mechanical reinforcement in thermoplastic cassava starch
DOI:
https://doi.org/10.15649/2346030X.2989Keywords:
montmorillonite, starch, cassava, mechanical propertiesAbstract
A wide range of plastic products of petrochemical origin are in the market due to their good mechanical properties and low cost, however, it is of public knowledge the high negative impact that these materials are causing in the environment that end up affecting biological life in every aspect. Thus, the search for new alternatives to replace these plastics has become of interest for both the industrial sector and scientists, so in the present work the researchers explored the initiative of obtaining biopolymer nanocomposites in the form of thin film from thermoplastic cassava starch and Montmorillonite K10 type clays, the latter being used as mechanical reinforcement of the final product. The main objective of the research was to evaluate the effect of clay insertion in the biopolymeric matrix on the mechanical properties of the thermoplastic films. The preparation of the samples was carried out by the starch gelatinization process, where the baseline formulation (BPG), also known as thermoplastic matrix, was made of glycerin (plasticizer) 30% by weight. This matrix was subsequently reinforced with three different percentages of montmorillonite K10 clay (MMT): 3%, 5% and 10%, called BPGK-3%, BPGK-5% and BPGK-10%, respectively. Mechanical properties were measured and all thermoplastic films were observed by optical microscopy. The formulation with the best mechanical properties was BPGK-5% with maximum stress, elongation at break and Young's modulus values of: 1.9 Mpa, 34% and 15.3 Mpa, respectively, as a consequence of the distribution of the clay particles in the thermoplastic matrix.
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