Document Type : Research Paper

Authors

1 M.S., Student, Wood and Paper Science Department, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resource University Sari, Iran

2 Associate Professor, Department of Wood and Paper, Faculty of Natural Resources, Sari University of Agricultural Sciences and Natural Resources, Iran

Abstract

Concerns about environmental pollution caused by petroleum-based packaging materials waste have increased the motivation to research and study on biodegradable packaging materials. In this study, in order to make added value and reprocess of the recycled papers, cellulose nanocrystals were produced from them and added to the hydroxypropyl methyl cellulose / cationic starch nanocomposite in amounts of (3%, 5%, 7%, 9% and 11%) and their structural, strength and barrier properties were investigated. The yield of crystalline cellulose nanoparticles produced from this alpha cellulose was about 65% and according to the (TEM) test results, the obtained nanoparticles were rod-shaped and had a length of 100 to 150 nm and a diameter of 15 to 30 nm. Also, their degree of crystallinity was 79.6% according to the X-ray diffraction test. According to the results, with the addition of cellulose nanocrystals to the nanocomposites, the tensile strength, moisture absorption resistance, and oxygen permeability resistance were increased and only the strain to the breaking point (Flexibility) was decreased and the best strength properties and barrier properties of the nanocomposites were obtained in the presence of 9% cellulose nanocrystals from recycled papers.

Keywords

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