Authors:
M. V. Alonso Departamento de Ingeniería Química, Facultad de Cienicas Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid, Spain

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M. Oliet Departamento de Ingeniería Química, Facultad de Cienicas Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid, Spain

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J. C. Domínguez Departamento de Ingeniería Química, Facultad de Cienicas Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid, Spain

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E. Rojo Departamento de Ingeniería Química, Facultad de Cienicas Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid, Spain

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F. Rodríguez Departamento de Ingeniería Química, Facultad de Cienicas Químicas, Universidad Complutense de Madrid, Avda. Complutense s/n, 28040, Madrid, Spain

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Abstract

Resol resins are used in many industrial applications as adhesives and coatings, but few studies have examined their thermal degradation. In this work, the thermal stability and thermal degradation kinetics of phenol–formaldehyde (PF) and lignin–phenol–formaldehyde (LPF) resol resins were studied using thermogravimetric analysis (TG) in air and nitrogen atmospheres in order to understand the steps of degradation and to improve their stabilities in industrial applications. The thermal stability of samples was estimated by measuring the degradation temperature (Td), which was calculated according to the maximum reaction rate criterion. In addition, the ash content was determined at 800 °C in order to compare the thermal stability of the resol resin samples. The results indicate that 30 wt% ammonium lignin sulfonate (lignin derivative) as filler in the formulation of LPF resin improves the thermal stability in comparison with PF commercial resin. The activation energies of degradation of two resol resins show a difference in dependence on mass loss, which allows these resins to be distinguished. In addition, the structural changes of both resins during thermal degradation were studied by Fourier transform infrared spectroscopy (FTIR), with the results indicating that PF resin collapses at 300 °C whereas the LPF resin collapses at 500 °C.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)