Biodegradation behavior and material properties of aliphatic/aromatic polyesters of commercial importance |
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Authors: | Uwe Witt Rolf- Joachim Müller Wolf- Dieter Deckwer |
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Institution: | (1) Gesellschaft für Biotechnologische Forschung mbH, Bioverfahrenstechnik, Mascheroder Weg 1, D-38124 Braunschweig, Germany |
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Abstract: | Copolyesters of aliphatic monomers with a defined amount of terephthalic acid recently have been shown to be biodegradable.
This group of plastic materials exhibits very interesting material properties with regard to their technical application potential.
A tensile strength of 25 N/mm2 combined with elongations at break up to 1500% was achieved for BTA materials. Melting points varied from 80 to 140‡C. Biodegradation
rate under compositing conditions were determined, showing typical erosion rates of films, in the range of 5 to 10 Μm/week.
The material properties and the degradation rate as well can be adjusted by the copolymer composition. Stretching of the polymer
in the cold state leads to 10-fold higher mechanical strength of the material. The polyester chain can be extended to high
molar masses, resulting in melt viscosities suitable, e.g., for melt below extrusion. |
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Keywords: | Biodegradability poly(tetramethylene terephthalate)-co-(tetramethylene hexanedioate) 1 4-butanediol terephthalic acid adipic acid use properties copolyester compost |
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