TY - JOUR
T1 - Mixture Design Approach on the Physical Properties of Lignin-Resorcinol-Formaldehyde Xerogels
AU - Castro, Chris D.
AU - Quintana, Germán C.
N1 - Publisher Copyright:
© 2015 C. D. Castro and G. C. Quintana.
PY - 2015
Y1 - 2015
N2 - Organic xerogels were functionalized by incorporating sugarcane bagasse lignin from soda pulping black liquor, not used so far in this materials, with the aim of introducing new functional groups on traditional gels that could improve its adsorptive capacity. Two mixing designs were applied to identify the reactive combinations that allow a well gel formation and to adjust models that predict physical properties. The designs study five components: resorcinol (R, 0.04-0.3), lignin (L, 0.004-0.14), formaldehyde (F, 0.08-0.17), water (W, 0.45-0.8), and NaOH (C, 0.0003-0.0035). The first experimental design was an extreme vertices design and its results showed shrinkage between 4.3 and 59.7 and a bulk density from 0.54 to 1.3; a mass ratio LR/F near 1.5 was required for gel formation. In the second design a D-Optimal was used to achieve better adjusted coefficients and incorporate the largest possible amount of lignin in the gels. Bulk density varies from 0.42 to 0.9, shrinkage varies from 3.42 to 25.35, and specific surface area reaches values of 451.86 m2/g with 13% lignin and 270 m2/g with 27% lignin. High catalyst content improves lignin dissolution and increase shrinkage and bulk density of xerogels and bulk density. Lignin contributes to reducing shrinkage and specific surface area due to his compact and rigid structure.
AB - Organic xerogels were functionalized by incorporating sugarcane bagasse lignin from soda pulping black liquor, not used so far in this materials, with the aim of introducing new functional groups on traditional gels that could improve its adsorptive capacity. Two mixing designs were applied to identify the reactive combinations that allow a well gel formation and to adjust models that predict physical properties. The designs study five components: resorcinol (R, 0.04-0.3), lignin (L, 0.004-0.14), formaldehyde (F, 0.08-0.17), water (W, 0.45-0.8), and NaOH (C, 0.0003-0.0035). The first experimental design was an extreme vertices design and its results showed shrinkage between 4.3 and 59.7 and a bulk density from 0.54 to 1.3; a mass ratio LR/F near 1.5 was required for gel formation. In the second design a D-Optimal was used to achieve better adjusted coefficients and incorporate the largest possible amount of lignin in the gels. Bulk density varies from 0.42 to 0.9, shrinkage varies from 3.42 to 25.35, and specific surface area reaches values of 451.86 m2/g with 13% lignin and 270 m2/g with 27% lignin. High catalyst content improves lignin dissolution and increase shrinkage and bulk density of xerogels and bulk density. Lignin contributes to reducing shrinkage and specific surface area due to his compact and rigid structure.
UR - http://www.scopus.com/inward/record.url?scp=84944207987&partnerID=8YFLogxK
U2 - 10.1155/2015/272851
DO - 10.1155/2015/272851
M3 - Artículo en revista científica indexada
AN - SCOPUS:84944207987
SN - 1687-9422
VL - 2015
JO - International Journal of Polymer Science
JF - International Journal of Polymer Science
M1 - 272851
ER -