Evaluating efficacy of different UV-stabilizers/absorbers in reducing UV-degradation of lignin

Nikafshar, Saeid; Nejad, Mojgan

doi:10.1515/hf-2021-0147

Title: Evaluating efficacy of different UV-stabilizers/absorbers in reducing UV-degradation of lignin

Journal Article · 21 December 2021 · Holzforschung

DOI: https://doi.org/10.1515/hf-2021-0147 · OSTI ID:1964209

Nikafshar, Saeid ^[1];

^[1]

Michigan State Univ., East Lansing, MI (United States)

Susceptibility of wood to UV degradation decreases the service life of wood products outdoors. Organic UV absorbers (UVAs) and hindered amine light stabilizers (HALSs), as well as inorganic UVAs, are added to coatings to improve the UV stability of coated-wood products. Although about 85% of UV radiation is absorbed by lignin in the wood, it is unclear which UV stabilizers can minimize lignin degradation. In this study, the photodegradation of softwood organosolv lignin was monitored over 35 days of UV exposure. Changes in lignin properties were assessed using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), gel permeation chromatography (GPC), and phosphorus-31 nuclear magnetic resonance spectroscopy (31P NMR). It was found that the aromatic rings of lignin underwent significant degradation, resulting in increased glass transition temperature and molecular weight of lignin. Subsequently, 18 different additives were mixed with lignin and exposed to UV irradiation. The analysis of samples before and after UV exposure with FTIR revealed that inorganic UVAs (cerium oxide and zinc oxide) and a mixture of organic UVAs and HALSs (T-479/T-292, T-5248, and T-5333) were the most effective additives in reducing lignin degradation. This study can help coating scientists to formulate more durable transparent exterior wood coatings.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE

Grant/Contract Number:: EE0008148; 1624536-IIP

OSTI ID:: 1964209

Alternate ID(s):: OSTI ID: 1878160

Journal Information:: Holzforschung, Vol. 76, Issue 3; ISSN 0018-3830

Publisher:: de GruyterCopyright Statement

Country of Publication:: United States

Language:: English

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