Natural Antioxidants for Polyesters Stabilisation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F18%3A63521343" target="_blank" >RIV/70883521:28610/18:63521343 - isvavai.cz</a>

Result on the web

<a href="http://cps.utb.cz/images/aktuality/Sborn%C3%ADk_PLASTKO_2018.pdf" target="_blank" >http://cps.utb.cz/images/aktuality/Sborn%C3%ADk_PLASTKO_2018.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Natural Antioxidants for Polyesters Stabilisation

Original language description

Polyesters are polymers which are mostly used in laminating resins, molding compositions, films, surface coatings, rubbers, composites etc. [1]. The most well-known man-made polyester is polyethylene terephthalate (PET), which is used in the form of synthetic fibers. This polymer is generally non-biodegradable [2]. The resulting environmental impact of high global production of plastic materials has encouraged efforts from the polymer industry to develop biodegradable materials. Polylactic acid (PLA) is an aliphatic polyester derived from renewable sources, mainly starch and sugar. PLA polymers and their derivatives stand at the forefront of practical use [3]. This polymer has very low toxicity and high mechanical performance comparable to other commercial polymers such as PET and polystyrene (PS). It is highly transparent and has good barrier properties to aromas. A continuing challenge for the polymer industry is to deliver new effects or enhanced properties from a range of materials that is often increasingly restricted [4]. A wide variety of compounds have been added to polymers to improve their stability. The main factors determining degradation during processing are elevated temperature, shear forces and the amount of oxygen present. The oxidation processes were traditionally inhibited using synthetic phenolic antioxidants but the possible health and environmental hazard represented by these compounds appeared. The attention turned towards the possible use of natural antioxiodants as a potential stabilizers for polymers. The main natural antioxidants are carotenoids (contained in carrot, tomato, spinach, corn), flavonoids (found in red grapes, citruses, onion, leaves of green tea), phenolic acids (contained in various seeds), lignin and tannins (found in leaves and barks of woods). Flavonoids are the most effective processing stabilizers. Carotenoids act as antioxidants at small concentrations, but as pro-oxidants when 179 their amount is large. Natural antioxidants can be used in certain applications, but further research is needed to utilize their advantages in the full extent [5].

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů