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In this section, you can access to the latest technical information related with the viability of Polylactic Acid (PLA) synthesis from waste products of bakery industry and their use in the fabrication of a 100% biodegradable film to be used in the packaging of bakery products. BREAD4PLA partners will receive a monthly bulletin referencing the most interesting articles, news, patents, etc…

Degradation of PLA fibers at elevated temperature and humidity (pages 1652–1660)

» Author: Mary K. Mitchell andDouglas E. Hirt*

» Reference: Polymer Engineering & ScienceVolume 55, Issue 7, pages 1652–1660, July 2015

» More Information

The hydrolytic degradation of poly(lactic acid) (PLA) devices has previously been reported as size dependent for devices such as plates, microspheres, and films between 2 and 0.3 mm in thickness or diameter. In this study, the effect of fiber diameter on the degradation characteristics of PLA fiber of two diameters, 32 µm (PLA32) and 118 µm (PLA118), aged at 40, 60, and 80°C with 100% relative humidity, was investigated. Additionally, both PLA32 and PLA118 were aged at 40 and 60°C under nitrogen purge. The degradation of the fibers was evaluated based on changes in the total weight, crystallinity, and molecular weight of the samples. Both diameters exhibited similar total weight loss, crystallinity, and molecular weight loss profiles under each set of degradation conditions. Two models for the change in molecular weight were compared: a first order model and an autocatalytic model. For the obtained data, both models provided a reasonable fit of the molecular weight data. Based on the rate constants obtained for each model, the activation energy for PLA degradation was calculated (26.3 kcal mol−1 for the first order model and 22.4 kcal mol−1 for the autocatalytic model). The activation energies obtained were close to other values reported in the literature for PLA hydrolysis. POLYM. ENG. SCI., 55:1652–1660, 2015. © 2014 Society of Plastics Engineers


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