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Chemical modification as a strategy to modulate properties of oxypropylated pro...
Barbosa, M.; Matos, M.; Barreiro, M.F.; Gandini, A.Nowadays a great interest is devoted to the production and use of biobased products. The main scope of the oxypropylation process is to obtain polyols, in the form of viscous liquids, which can be interesting co-monomers to produce polyurethanes and polyesters. Due to the high hydroxyl content of natural polymers (suitable substrates to be oxypropylated), the generated polyols are multifunctional, hence most ad...
New polyurethanes from oxypropylated olive stone
Barbosa, Mariana Martinho; Matos, M.C.; Barreiro, M.F.; Gandini, A.The purpose of this work is to explore the possibility of chemically modifying the generated polyols (oxypropylated olive stone) through reactions with isocyanates to produce polyurethanes, other than rigid polyurethane foams. This could be achieved by the chemical modification of the oxypropylation products (condensation with isocyanates) by using mono and difunctional reagents to modulate properties and/or pr...
Search for novel biobased materials within the OLIVPOL project
Matos, M.C.; Barbosa, Mariana Martinho; Barreiro, M.F.; Gandini, A.Within the context of the project OLIVPOL, olive stone (OS) residue was successfully converted into viscous polyols, as such, or containing reinforcing stone cores, by total or partial oxypropylation, respectively. Moreover, the synthesis of new macromolecular materials using the oxypropylated products, such as polyesters and polyurethanes, demonstrated a promising approach to the production of original value-a...
The oxypropylation of olive stone and the use of the ensuing polyols for th...
Matos, M.C.; Barreiro, M.F.; Gandini, A.The development of polyols by the oxypropylation of abundant and renewable vegetable and animal resources constitutes an original approach to the exploitation of the biomass. Cellulose, starch, chitosan, chitin, different types of lignins, cork and more complex structures like sugar beet pulp, are among the documented examples. All these systems displayed a similar pattern in terms of the grafting of short poly...
Olive stone as a renewable source of biopolyols
Matos, M.C.; Barreiro, M.F.; Gandini, A.The purpose of this work was to establish the feasibility of converting the olive stone residue by means of both total and partial oxypropylation. In the first case, the oxypropylation reaction conditions are chosen in order to promote extensive grafting, thus assuring a complete “liquefaction” of the material and, in the second case, partial oxypropylation would limit the reaction to the outer shell in view o...
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