부산대학교 도서관

Recently, research and innovation in the development of eco-friendly plastic materials are progressing rapidly, and these efforts began with the desire to find alternatives to plastic materials as concerns about climate change and environmental pollution grow. The development of eco-friendly plastic materials is being carried out in a variety of ways, including bioplastics, recyclable plastics, recycling of marine plastics, and plastic replacement materials. First, bioplastics, which are plastics extracted from vegetable raw materials or produced by microorganisms, are mostly made from renewable resources and have the characteristic of being naturally degradable. Recyclable plastic materials, which can be recycled more easily than existing plastics, have the advantage of reducing waste of resources as they have high efficiency in the recycling process. Currently, research on technology to create new products by recycling plastic collected from the ocean is expanding to produce useful products while purifying the marine environment, or to replace existing plastics using eco-friendly materials such as paper, nylon, and starch. By introducing nanotechnology, we are trying to develop stronger, lighter, and more eco-friendly plastic materials by improving the mechanical and physical properties of plastic materials. In addition, by adopting a circular economy model for plastic production and use, we are aiming to reduce resource consumption by extending product lifespan and promoting reuse and recycling. Such research and innovation are accelerating as awareness of environmental issues increases, and it is expected that more eco-friendly and sustainable plastic materials will be developed in the future. Cellulose material, which is the most abundant natural polymer material on Earth, has excellent recyclability and biodegradability and is used in large quantities for paper and textile fibers. Cellulose derivatives are used to make plastics, adhesives, films, anti-foaming agents, celluloids, and other industrial materials. In general, natural cellulose contains about 70 % of the crystalline portion and has excellent mechanical properties, but it is difficult to process due to the strong intermolecular bonding force and high crystallinity due to the hydrogen bond between the O-H groups at the terminals, and it decomposes before reaching the melting point. It has the disadvantage of being difficult to mold, so to compensate for this, it is converted to a cellulose derivative and applied through solution or melt processing methods. In order to use cellulose acetate derivatives as injection molding materials, technology for controlling the molecular weight of the material, identifying the melting phenomenon according to the molecular structure, and manufacturing technology for cellulose compositions that satisfy the thermal and physical properties to secure competitiveness with existing materials are required. We sought to achieve this through this paper. In this dissertation, a material that is easy to process and mold was manufactured by controlling the viscosity and thermal properties of the composition using an eco-friendly plasticizer based on cellulose acetate prepared through an esterification reaction. Using this, research was conducted to improve the mechanical strength of the composition by melt blending various bio additives.