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7. Preparation and characterization of citric acid crosslinked chitosan‐cellulose nanofibrils composite films for packaging applications.

Author

Ponnusamy, Prabaharan Graceraj, Sundaram, Jaya, and Mani, Sudhagar

Subjects
PACKAGING film, CITRIC acid, WATER vapor, CHITOSAN, SCANNING electron microscopy, TENSILE strength, SURFACE morphology
Abstract

The inferior water vapor permeability and water resistance properties are the major challenges that hindered the development of chitosan‐CNF composites for packaging applications. In this study, the chitosan‐CNF composite films were prepared with in situ crosslinking of citric acid (CA) to reduce the percent water uptake (WU) and water vapor permeability (WVP). The composite films were produced by the solvent casting method with 10%, 15%, and 20% CNF as a reinforcement, 20%, 25%, and 30% CA as a crosslinker, and 20% glycerol as a plasticizer. The Fourier transform infrared (FTIR) spectra of composite films with a peak at 1710 cm−1 confirmed the effective crosslinking of citric acid on the chitosan‐CNF matrix. The crosslinked composite films exhibited the lowest WU of 39% and WVP of 9.99 × 10−7 g/Pa s m2 with reduced light transmittance due to CNF reinforcement. The scanning electron microscopy (SEM) study showed the smooth surface morphology of composite films. The CA crosslinking slightly decreased the tensile strength of composite films. However, the composite film with optimal CNF and CA concentration (25% and 20%, respectively) exhibited comparable tensile strength with other synthetic and biopolymer composites and can be used as a potential biopolymer composite for packaging applications. [ABSTRACT FROM AUTHOR]

Published
2022
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9. Investigations into tensile strength of jute fiber reinforced hybrid polymer matrix composites

Author

Ponnusamy Prabaharan Graceraj and Gopalan Venkatachalam

Subjects
stomatognathic system, technology, industry, and agriculture, tensile strength, natural resin, alkali treatment, fiber length, fiber volume
Abstract

Nowadays several industrial applications require biodegradable or environment friendly materials in place of existing materials in use without any compromise on their properties or their improved performance. Natural fiber reinforced polymer resin composites are biodegradable composites as they are using fibers from renewable sources. Biodegradation of the above composites can further be improved by adding natural resin with synthetic polymer resin. The experimental research work has been carried out using composite of Polyester (Synthetic Resin) – cashew nut shell liquid (CNSL) resin (natural resin) with jute fiber as reinforcement. Tensile test was performed on specimens made of composites with various proportion of CNSL and polyester resin and jute fiber reinforcement with different alkali treatment, fiber length and fiber volume. Influence of the above factors on tensile strength was analyzed and the best combinations of factors are suggested for composite processing.

Published
2015

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