By Robin Smith
The majority of plastic items are made up of petroleum-based artificial polymers that don't degrade in a landfill or in a compost-like setting. for that reason, the disposal of those items poses a major environmental challenge. An environmentally-conscious substitute is to design/synthesize polymers which are biodegradable.
Biodegradable polymers for business functions introduces the topic via outlining the class and improvement of biodegradable polymers. fabrics to be had for the construction of biodegradable polymers are explored. Polymers derived from sugars, average fibres, renewable wooded area assets, poly(lactic acid) and protein-nanoparticle composites are checked out intimately during this part. The houses and mechanisms of decay are checked out, prefacing the topic with a bankruptcy on present criteria. the ultimate half explores possibilities for business purposes, with chapters on packing, agriculture and biodegradable polycaprolactone foams in supercritical carbon dioxide.
Biodegradable polymers for commercial purposes explores the elemental recommendations in regards to the improvement of biodegradable polymers, degradable polymers from sustainable assets, degradation and homes and commercial functions. it really is an authoritative ebook that's priceless for lecturers, researchers and coverage makers within the industry.
- Reviews the significance and commercial use of biodegradable polymers and degradable polymers from sustainable sources
- An useful source for either teachers and industry
- Edited by means of a number one authority within the box with contributions from a world workforce of experts
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Additional resources for Biodegradable polymers for industrial applications
3 summarises the possibilities offered by some of the commercial biopolymers. Their mechanical properties are comparable with those of conventional polymers (Clarinval, 2002). There are flexible materials with medium service temperature like polyethylene (PE), relatively stiff materials with medium service temperature like polystyrene (PS) and stiff materials with a high service temperature like polyethylene terephthalate (PET). 4 gives a comparison of the typical properties of biopolymers with those of polyolefins.
The glass transition is 36 ëC and the melting temperature is 225 ëC. PGA is not soluble in most organic solvents but has a high sensitivity to hydrolysis. It can be processed by extrusion, injection and compression moulding. The attractiveness of PGA as a biopolymer in medical applications is the fact that its degradation product (glycolic acid) is a natural metabolite. Polylactic acid (PLA) (Fig. 12) is produced by ring opening of the lactide, a diester of lactic acid that can be obtained from oil even though the natural origin is now largely known.
Different products including combs, pens and bullets have been made from PHB produced by Alcaligenes latus. /China. Growth was carried out for 48 h in a glucose mineral medium. At the end of the cell growth, cell density reached 160 g/l. The cells produced 80% PHB in their dry weight. Most surprisingly, the strain grown to such a high density did not require oxygen-enriched air. This was perhaps the © 2005, Woodhead Publishing Limited 44 Biodegradable polymers for industrial applications highest cell density for PHB production achieved in a pilot scale production (unpublished results).