Partial or Toral Oxypropilation of Natural Polymers and the Use of the Ensuing Materials as Composites or Polyol Macromolecules


This chapter describes the partial and total oxypropylation of various natural polymers and more complex biomass substrates and the use of the ensuing materials as composites or polyol macromonomers, respectively. The total oxypropylation of different lignins, sugar beet pulp, cork, chitin and chitosan, and olive pits is then reviewed in terms of its success in converting all these substrates into viscous polyol mixtures, which can be used to prepare polyurethane foams with thermal insulating properties similar to those of conventional industrial counterparts. Finally, this chapter deals with the superficial oxypropylation of cellulose fibers and starch granules (i.e. reactions limited to a certain thickness of the substrates) so that the ensuing materials keep their original morphology and properties, but now possess a thermoplastic shell which enables their conversion to single-component composites by simple thermal processing.


Naceur BM, Alessandro G

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