Repositorio
Institucional

Meléndrez Castro, Manuel Francisco

Jaramillo, A. F.

Martinez, J. C.

Flores, P.

Medina, C.

Rojas, D.

Diaz-Gomez, A.

Fuentealba, C.

Condensed tannin resins extracted from Pinus radiata bark as a support matrix in carbon nanofiber-reinforced polymers

SPRINGER

POLYMER BULLETIN

en

Condensed tannins extracted from the Pinus radiata bark (PRTs) were used as a replacement for phenol in the synthesis of resol-type phenolic resins (FRs) and tested as polymer matrix in carbon nanofiber (CNF)-reinforced composite materials. The PRTs used herein contained a phenol and lignin content of 31 (Eq/L) and 35 (%w/w), respectively. The molecular weights of these polyphenols indicated the presence of 16 flavonoid units. Tannin resins were synthesized, and their characteristics were compared with those of the synthesized FRs using a formaldehyde/phenol ratio of (1.6/1.0), which has the highest total solids content. The results showed that the gel time and useful life of the resins decreased with the addition of the tannins, while there was no significant variation in the degradation temperature with varying FR contents. The mechanical properties of the CNF-reinforced composite materials were determined by DMA, and the results showed an increase of 1000 MPa, due to the better distribution of the fibers in the matrix. The modulus (E') in the reinforced composite materials with tannin resins was 2322 MPa and 1803 MPa without tannins, while modulus E center dot for composite materials doubled for resins with tannins. Tannins improved the dispersion of CNTs and the matrix-filled interface.

artículo original

The authors would like to thank to the Interdisciplinary Group of Advanced Nanocomposites (Grupo Interdisciplinario de Nanocompuestos Avanzados, GINA) of the Department of Engineering Materials (DIMAT, according to its Spanish acronym), Engineering School of the University of Concepcion, for its laboratory of nanospectroscopy (LAB-NANOSPECT). AFJ would like to thank the University of La Frontera. National Agency for Research and Development of Chile (ANID) by project: FONDEQUIP Project N degrees EQM150139, PIA/APOYO CCTE AFB170007 and Fondecyt initiation 11190358. MFM would like to thank Valentina Lamilla for her enormous support.

Los autores agradecen al Grupo Interdisciplinario de Nanocompuestos Avanzados (GINA) del Departamento de Ingeniería de Materiales (DIMAT), Facultad de Ingeniería de la Universidad de Concepción, por su laboratorio de nanoespectroscopia (LAB-NANOSPECT). AFJ quisiera agradecer a la Universidad de La Frontera. Agencia Nacional de Investigación y Desarrollo de Chile (ANID) por proyecto: Proyecto FONDEQUIP N grados EQM150139, PIA/APOYO CCTE AFB170007 y Fondecyt iniciación 11190358. MFM agradece a Valentina Lamilla por su enorme apoyo.

10.1007/s00289-020-03530-8

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Condensed tannins

Phenol

formaldehyde resins

Matrix reinforcement

PHENOL-FORMALDEHYDE RESIN

POLYURETHANE

COMPOSITES

Ciencia de los polímeros

Taninos condensados

Fenol

resinas de formaldehído

Refuerzo de matriz

RESINA DE FENOL-FORMALDEHÍDO

POLURETANO

COMPOSITES

Compuestos (Laminados, Plásticos Reforzados, Fibras Sintéticas y Naturales)

Polímeros

Ingeniería de los Materiales

Condensed tannin resins extracted from Pinus radiata bark as a support matrix in carbon nanofiber-reinforced polymers

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artículo original

version publicada

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restringido

ANID-FONDEQUIP EQM150139

ANID-FONDECYT 11190358

ANID FONDEQUIP EQM150139

ANID FONDECYT 11190358

WOS:000605886100002