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Impact of ionizing radiation on the properties of a hydrobiodegradable aliphatic - aromatic copolyester

Kubera H., Melski K., Assman K., Głuszewski W., Migdał W., Zimek Z., Czaja-Jagielska N.

Nukleonika

2012

Vol. 57, No. 4

621-626

This paper presents the results of the studies on changes of selected quality parameters of hydrobiodegradable aliphatic-aromatic copolyester (AAC). Radiation treatment was performed at the Institute of Nuclear Chemistry and Technology in Warsaw, using cobalt gamma-ray sources "Issledovatel" (dose rate 0.389 Gy/h) and "GC 5000" (8.5 Gy/h). The material was subjected to the impact of radiation doses of 5, 10, 20 and 40 kGy. Selected parameters of the packaging material, important from the standpoint of a potential application, have been studied: gaseous products of radiolysis, strength parameters in accordance with PN EN ISO 527-3, global migration PN-EN-1186-1:2002, FT-IR analysis using PCA method, contact angle measurement using the drop shape method. The results have demonstrated that there is no significant influence of ionizing radiation on AAC film parameters. Correlation between doses applied and values of measurements has not been found.

A preliminary study of the degradation of selected commercial packaging materials in compost and aqueous environments

Musioł M.T., Rydz J., Sikorska W.J., Rychter P.R., Kowalczuk M.M.

Polish Journal of Chemical Technology

2011

Vol. 13, nr 1

55-57

The paper presents the results of the degradation of two commercial packaging materials CONS-PET and BioPlaneta in the compost and distilled water at 70°C. The materials containing polylactide (PLA), CONS-PET 13% and BioPlaneta 20%, aliphatic-aromatic copolyester terephthalic acid/adipic acid/1,4-butanediol (BTA) and commercial additives degraded under the industrial composting conditions (composting pile or container) and in distilled water at 70°C in the laboratory holding oven. Distilled water provided the conditions for the hydrolytic (abiotic) degradation of the materials. Weight loss, changes of molecular weight, dispersity monitored via the GPC technique and the macroscopic surface changes of the tested materials were monitored during the experiments. The investigated systems show similar trends of degradation, however on the last day of the incubation the decrease of the molecular weight was higher in water than under the industrial composting conditions. The results indicate that commercial packaging materials can be degraded both while composting ((bio)degradation) and during the incubation in distilled water at 70°C (abiotic hydrolysis).

Hydrolytic degradation of copolyesters based on dilinoleic acid

Kozłowska A., Zdebiak P., El Fray M.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 3

90-91

The synthesis method, characterization and preliminary degradation studies of novel aliphatic and aliphatic/ aromatic polyesters were presented. Preliminary results on selected properties as well as on degradation were discussed. Hydrogenated dilinoleic acid, succinic acid and 1,4-butanediol were used for the synthesis of aliphatic sequences, while dibutylene terephthalate was used as a an aromatic unit.