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Polymers 2018, 10(9), 985; https://doi.org/10.3390/polym10090985

Reinforcement of Thermoplastic Corn Starch with Crosslinked Starch/Chitosan Microparticles

1
LEPABE, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
2
IFIMUP and IN—Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
3
DEMad—Instituto Politécnico de Viseu, Campus Politécnico de Repeses 3504-510 Viseu, Portugal
*
Author to whom correspondence should be addressed.
Received: 25 July 2018 / Revised: 30 August 2018 / Accepted: 31 August 2018 / Published: 4 September 2018
(This article belongs to the Special Issue Recent Advances in Bioplastics)
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Abstract

Microparticles of corn starch and chitosan crosslinked with glutaraldehyde, produced by the solvent exchange technique, are studied as reinforcement fillers for thermoplastic corn starch plasticized with glycerol. The presence of 10% w/w chitosan in the microparticles is shown to be essential to guaranteeing effective crosslinking, as demonstrated by water solubility assays. Crosslinked chitosan forms an interpenetrating polymer network with starch chains, producing microparticles with a very low solubility. The thermal stability of the microparticles is in agreement with their polysaccharide composition. An XRD analysis showed that they have crystalline fraction of 32% with Va-type structure, and have no tendency to undergo retrogradation. The tensile strength, Young’s modulus, and toughness of thermoplastic starch increased by the incorporation of the crosslinked starch/chitosan microparticles by melt-mixing. Toughness increased 360% in relation to unfilled thermoplastic starch. View Full-Text
Keywords: thermoplastic starch; corn starch; chitosan; crosslinked microparticles thermoplastic starch; corn starch; chitosan; crosslinked microparticles
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Paiva, D.; Pereira, A.M.; Pires, A.L.; Martins, J.; Carvalho, L.H.; Magalhães, F.D. Reinforcement of Thermoplastic Corn Starch with Crosslinked Starch/Chitosan Microparticles. Polymers 2018, 10, 985.

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