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Photo-biodegradation mechanism

Figure 3.2 Mechanical property change of photo-biodegradable polyethylene carrier bags during outdoor exposure in England (Reproduced with permission from D. Gilead and G. Scott, in Developments in Polymer Stabilisation - 5, ed. G. Scott, Applied Science Publications, 1982, p. 103)... Figure 3.2 Mechanical property change of photo-biodegradable polyethylene carrier bags during outdoor exposure in England (Reproduced with permission from D. Gilead and G. Scott, in Developments in Polymer Stabilisation - 5, ed. G. Scott, Applied Science Publications, 1982, p. 103)...
Photo-biodegradable polyethylene using the above system was developed commercially for use in agriculture by D. Gilead of Plastopil Hazorea in Israel in collaboration with the author and is now widely used as Plastor in mulching films in Europe and Plastigone in the USA. It is also used in polypropylene baler twines as Cleanfields by AMBRACO in the USA, and in controlled release fertilisers as Nutri-cote by Chisso-Asahi Fertilizer Company in Japan. The biodegradation mechanism will be discussed below. [Pg.102]

The introduction of photo-biodegradable plastic films substantially prevents the problems commonly arising from the use of other, non-speciality plastic products, thus extending the agricultural benefits and environmental compatibility of this technique in mechanical harvesting of herbaceous crops. [Pg.200]

Polyethylene oxide) (PEO) is a semicrystalline water-soluble polymer [64, 65], with a crystallinity that is very sensitive to the thermal history of the sample, making this property interesting as an indicator of degradation. Because it is biodegradable and biocompatible, PEO is a good candidate for environmental and medical applications [66-68]. The mechanisms of thermo- and photo-oxidation of PEO have already been investigated [69, 70] on the basis of IR identification of the oxidation products and are summarized in Scheme 10.1. [Pg.255]

In the photoageing of polycarbonates, photo-oxidation has been shown to be a more important process than the photo-Fries reaction. The photo-oxidation of epoxy-resins has been found to depend on the type of hardener and its concentration. A correlation has been observed between the changes in chemical structure and thermally stimulated current of poly(vinyl alcohol) during photo-oxidation. Other studies of interest include the weathering of polymers outdoors,effect of ozonation on polymers, effect of drawing, effect of biodegradation, and changes in mechanical properties of thermoplastics. ... [Pg.543]

Sharih, S., et al. 2012. Biodegradable nanocomposite hydrogel struemres with enhanced mechanical properties prepared by photo-crosslinking solutions of poly (trimethylene carbonate)-poly (ethylene glycol)-poly (trimethylene carbonate) macromonomers and nanoclay particles. Acta Biomaterialia 8(12) 4233-4243. [Pg.19]

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