Effect of Kraft Lignin from Hardwood on Viscoelastic, Thermal, Mechanical and Aging Performance of High Pressure Laminates.
Fecha
2017-07-10Autor
Taverna, María E.
Tassara, Oriana
Morán, Juan
Nicolau, Verónica V.
Estenoz, Diana
Frontini, Patricia
Metadatos
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In this work, the synthesis and characterization
of phenol-formaldehyde resols modified with 10, 20 and
30 wt% of Kraft lignin (a waste from pulp industry) from
hardwood were studied. In all cases, the Kraft lignin was
activated by hydroxymethylation. The resols characterization
involved industrial measurements of free formaldehyde,
viscosity, total solids and density. The resins were used for
the industrial impregnation of Kraft-type paper and the production
of laboratory laminates. The mechanical and thermal
properties of the laminates were determined. Mechanical
measurements included tensile, flexural, impact and interlaminar
tests. Thermogravimetric and dynamic mechanical
analysis were used for the thermal characterization. In
addition, the aging of materials in water was studied. No
significant differences in mechanical and thermal properties
between traditional and modified materials were found with
replacement up to 20 wt% of phenol. Modified laminates
exhibited better water resistance due to the lignin hydrophobicity.
This work was carried out in collaboration with
Centro S.A., San Francisco, Córdoba, Argentina, a high
pressure-laminates industry.
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