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By Dan Rafter,J. D. Bogle

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COM bioplastics > e-book > durable bioplastics Processing Durable Bioplastics the lowest molecular weight out of all the PHA polymers. PHA polymers have many advantages when hydroxyvalerate (HV) is added to produce the copolymer PHBV. PHBV copolymer is less stiff, tougher, and easier to process than PHB. It is water resistant and impermeable to oxygen. Depending on the percentage of HV added, the melting point of PHBV is between 100°C to 160°C. Plant syntheses of different forms of PHB are being researched.

More than 90% of PURs are produced from aromatic isocyanate. Commonly used aromatic isocyanates are toluene diisocyanate (TDI) and methylene diphenyl isocyanate (MDI); commonly used aliphatic isocyanates are hexamethylene diisocyanate and polymeric isocyanates (Friederichs, 2005). The isocyanates used for foam applications must be aromatic. TDI and MDI may be prepared from low-cost diamines, which constitute 95% of total consumed isocyanates (Vilar, 2002). It is possible to produce aliphatic diisocyanates from dimerised fatty acid, which is bio-based; and such products are available.

Synthetic polymers. These are versatile plastics, available in a variety of forms, ranging from flexible or rigid foams to elastomers, coatings, adhesives and sealants. PURs have recurring urethane groups in the main chain. PURs are the sixth most widely sold plastic in the world, after HDPE, LDPE, PP, PVC and LLDPE, accounting for approximately 6% of total consumption. PURs are prepared by reacting two components: a polyol and an isocyanate. The isocyanate component is derived from petrochemical feedstock, and the polyol component can be produced from renewable resources such as soybean oil, castor oil, sunflower oil, and rapeseed oil.

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