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Start Over Topic biodegradable polymers
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1. Effect of polyethylene wax/soy protein-based dispersion barrier coating on the physical, mechanical, and barrier characteristics of paperboards

Author

Pouya Marzbani, Ahmad Ali Pourbabaee, Mikko Ritala, Hanna Koivula, Maryam Yousefzadeh, Mohammad Azadfallah, Farhood Najafi, Helsinki Institute of Sustainability Science (HELSUS), Food Sciences, Department of Food and Nutrition, Faculty of Agriculture and Forestry, Department of Chemistry, and Mikko Ritala / Principal Investigator

Subjects
SOY PROTEIN, BIODEGRADABLE POLYMERS, WAX, Materials science, 116 Chemical sciences, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, Colloid and Surface Chemistry, Coating, Paperboard, Soy protein isolate, Grease, Ultimate tensile strength, EMULSIFYING PROPERTIES, GREASE RESISTANCE, Composite material, Soy protein, EDIBLE FILMS, Wax, Surfaces and Interfaces, General Chemistry, 021001 nanoscience & nanotechnology, OIL, Polyethylene wax, 0104 chemical sciences, Surfaces, Coatings and Films, Barrier characteristics, 416 Food Science, Dispersion coating, PHYSICOCHEMICAL PROPERTIES, visual_art, PAPER, engineering, visual_art.visual_art_medium, ISOLATE, Wetting, 0210 nano-technology, Dispersion (chemistry)
Abstract

Application of barrier dispersion coatings on paperboards, which must have proper moisture and grease resistance for food applications, has always been an interesting subject for the packaging industry. In this study, paperboards were coated with a novel dispersion barrier coating prepared through mixing soy protein isolate (SPI) and polyethylene wax (PE-wax). Different characterization methods were used to study the effects of coating and its composition on the physical, mechanical, and barrier characteristics of paperboards. The results indicated that the incorporation of PE-wax into the coating formulation caused significant reduction of the viscosity of coating slurries. It had no effect on the coating weight of the samples but increased the thickness of the coated paperboards as compared with those coated with SPI only. The increase of the wax content led to a reduction of 5-16% in the tensile strength values in comparison with the uncoated paperboards. Barrier characteristics, i.e., water vapor permeability (WVP), surface wettability, and water resistance, improved by adding PE-wax. In addition, it was found that there was a critical level for the addition of PE-wax, 50% of SPI, as no oil migration was detected when the paperboards coated with SPI coatings contained less than 50% PE-wax.

Published
2020
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2. Conversion of paper to film by ionic liquids : manufacturing process and properties

Author

Lauri K. J. Hauru, Atsushi Tanaka, Hannes Orelma, Antti Korpela, Alexey Khakalo, and Department

Subjects
Paper, 0106 biological sciences, BIODEGRADABLE POLYMERS, Materials science, SURFACE, Polymers and Plastics, 116 Chemical sciences, chemistry.chemical_element, 02 engineering and technology, Welding, WOOD, 01 natural sciences, Oxygen, law.invention, ALL-CELLULOSE, chemistry.chemical_compound, Wet strength, law, 010608 biotechnology, STRENGTH, Grease, COMPOSITES, Partial dissolution, Cellulose, Dissolution, PARTIAL DISSOLUTION, 021001 nanoscience & nanotechnology, All-cellulose composite, Biodegradable polymer, NMR, Ionic liquids, chemistry, Chemical engineering, Ionic liquid, CURRENT INTERNATIONAL RESEARCH, 0210 nano-technology, FIBERS
Abstract

In this study, we investigate the “chemical welding” of paper with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc) using a two-step process. First, the IL is transported into the structure of the paper as a water solution. Then, partial dissolution is achieved by activation with heat (80–95 °C), where the water evaporates and the surfaces of the fibres partially dissolve. The activated paper is washed with water to remove IL, and dried to fuse fibre surfaces into each other. The “chemically welded” paper structure has both elevated dry and wet strength. The treatment conditions can be adjusted to produce both paper-like materials and films. The most severe treatment conditions produce films that are fully transparent and their oxygen and grease barrier properties are excellent. As an all-cellulose material, the “chemically welded” paper is fully biodegradable and is a potential alternative to fossil fuel-based plastics.

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