Fekete, Szandra (2019) Biológiailag lebomló 3D nyomtató alapanyag vizsgálata. UNSPECIFIED thesis, UNSPECIFIED.
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Abstract
Nowadays, when the Earth's population is growing rapidly and oil production is finite, it is important to learn about alternatives of plastic production. The annual consumption of plastics in Hungary is more than 300 tons, most of which is either non-decomposable. Their recycling is not yet resolved. The most obvious solution has been to produce plastics from renewable resources, which are biodegradable, thus preventing further accumulation of nondegradable plastics. Such materials are biopolymers, which, when released into the environment, are capable of degradation under the influence of temperature, humidity and microorganisms. These plastics have faster degradation times under conventional conditions and in open environments than conventional plastics. In theory, biodegradation of conventional plastics can occur when the material is degraded to small particles and its molecular weight is low enough to undergo biodegradation. The degree of degradation can be determined by light, humidity, oxygen and temperature. In the natural environment, biodegradation of conventional plastics can take a long time, even hundreds of years. Plastics bearing the "biodegradable" label are biodegradable only under specific environmental conditions. All in all, biodegradation does not depend on the resource base of the material, which means that biodegradable plastics, like conventional plastics, can be bio-based and fossil-based. Socalled "oxo-plastics", or oxidatively degradable plastics, are conventional plastics that contain additives that accelerate the breakdown of the material into small parts by UV radiation or heat. Additives cause the plastic to break down over time into plastic particles and then to microplastics, which have properties similar to microplastics from the breakage of conventional plastics. It is questionable how the supposed biodegradation of oxidatively degradable plastics affects the habits of the consumer society. One of the most prominent representatives of biopolymers is polylactic acid, which is widely known as the base material for 3D printing. 3D printing is an additive manufacturing process that is becoming increasingly popular and demanding. It can be a more cost-effective solution than traditional methods in model manufacturing. Poly-lactic acid has good mechanical properties, just like technical polymers, which is why it can be used widely but only for less demanding applications. In my dissertation I investigated the crystallization of polylactic acid, which was carried out with a differential scanning calorimeter and tested its biodegradability under laboratory conditions.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Additional Information: | A szakdolgozat az EFOP-3.6.1-16-2016-00003 KFI folyamatok hosszú távú megerősítése a Dunaújvárosi Egyetemen című projekt keretein belül készült |
| Divisions: | Műszaki Intézet |
| Depositing User: | Gergely Beregi |
| Date Deposited: | 26 Aug 2021 11:02 |
| Last Modified: | 24 Feb 2022 09:31 |
| URI: | http://szakdolgozat.repo.uniduna.hu/id/eprint/199 |
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