Evaluation of paper coated with cationic starch and carnauba wax mixtures regarding barrier properties
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Studies of single-use packaging have aimed to replace materials obtained from non-renewable sources with biodegradable materials from renewable sources in response to environmental concerns. Their barrier properties maximize shelf life and product safety. To provide such green packaging, this work aimed to describe the chemical, physical, morphological, and barrier properties of bilayer coatings made from mixtures of cationic starch (S) and carnauba wax (W) on kraftliner paper (86 ± 1 g/m²). Two coating layers (15.0 ± 0.5 g/m²) of both materials in different proportions were compared to uncoated paper and doublewet-and-dry paper. The addition of cationic starch to carnauba wax raised the melting point of the wax, preventing it from completely entering the paper's pores but instead producing a layer on top of them. The hydroxyl groups present in coated paper S contributed to its hydrophilicity, showing a high Cobb value, absorbing 153 g/m² more water than control samples. Further, the mixtures showed higher hydrophobicity than the cationic starch-treated samples, with a high-water contact angle (100 ± 4°), similarly found for the W treatment. In addition, mixtures showed 0.35°/s less wettability than the W treatment. In terms of mechanical strength, the lower tensile strength and Young's modulus of the coated sheets brought on by hornification appear to have been predominantly caused by water in the suspensions. The addition of carnauba wax to the cationic starch decreased the resistance of coated papers to oil. However, there was an improvement in the water barrier by decreased water absorption and wettability and an increase in water contact angle.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 117177 |
| Tidsskrift | Industrial Crops and Products |
| Vol/bind | 203 |
| Antal sider | 15 |
| ISSN | 0926-6690 |
| DOI | |
| Status | Udgivet - 2023 |
Bibliografisk note
Funding Information:
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. The authors are grateful for the support of the Laboratory BioNano from the Federal University of Pelotas - UFPel, the Laboratory of Electron Microscopy and Analysis of Ultrastructural from the Federal University of Lavras - UFLA, and FINEP , FAPEMIG , CNPq , Rede RELIGAR and CAPES for supplying the equipment and technical support for experiments involving electron microscopy. The authors are also thankful for the Wood Science and Technology graduate program at the Federal University of Lavras – UFLA, the Forest, Nature, and Biomass section, and the department of Chemistry at the University of Copenhagen - UCPH. Likewise, Klabin S/A for supplying commercial kraft paper and some characterization.
Funding Information:
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. The authors are grateful for the support of the Laboratory BioNano from the Federal University of Pelotas - UFPel, the Laboratory of Electron Microscopy and Analysis of Ultrastructural from the Federal University of Lavras - UFLA, and FINEP, FAPEMIG, CNPq, Rede RELIGAR and CAPES for supplying the equipment and technical support for experiments involving electron microscopy. The authors are also thankful for the Wood Science and Technology graduate program at the Federal University of Lavras – UFLA, the Forest, Nature, and Biomass section, and the department of Chemistry at the University of Copenhagen - UCPH. Likewise, Klabin S/A for supplying commercial kraft paper and some characterization.
Publisher Copyright:
© 2023 Elsevier B.V.
ID: 361444383