Resistance against fungal decay of Scots pine sapwood modified with phenol-formaldehyde resins with substitution of phenol by lignin pyrolysis products-Reference-Cited by-同舟云学术

Resistance against fungal decay of Scots pine sapwood modified with phenol-formaldehyde resins with substitution of phenol by lignin pyrolysis products

Published:2024-03-07 Issue:4 Volume:78 Page:231-243
ISSN:0018-3830
Container-title:Holzforschung
language:en
Short-container-title:

Author:

Karthäuser Johannes¹^ORCID,Treu Andreas²,Larnøy Erik²,Militz Holger¹,Alfredsen Gry²

Affiliation:

1. Department of Wood Biology and Wood Products , Faculty of Forest Sciences and Forest Ecology, University of Goettingen , Buesgenweg 4 , D-37077 Goettingen , Germany

2. Division of Forestry and Forest Resources , Norwegian Institute of Bioeconomy Research (NIBIO) , P.O. Box 115 , NO-1431 Ås , Norway

Abstract

Abstract Phenol-formaldehyde (PF) resins can be impregnated and cured in situ to improve the woods dimensional stability and decay resistance. In search of renewable alternatives, the substitution of phenol by lignin cleavage products (LCP) has been discussed. However, the different chemical nature may affect the performance of the resin against fungal decay, formaldehyde emission, and equilibrium moisture content. In this study, 30 % (w/w) of the phenol in PF resins were substituted by LCP obtained from microwave-assisted pyrolysis. Scots pine sapwood was modified with the resin. The decay resistance against Rhodonia placenta, Gloeophyllum trabeum, and Trametes versicolor was determined. Additionally, effects of specimen organisation within the Petri dish, different substrates, length of leaching, and type of inoculum were studied. Further, the materials water vapor sorption properties and formaldehyde emission were determined. All modifications effectively reduced fungal decay. With 10 % weight percent gain (WPG), initial decay was detected, while 20 % WPG and 30 % WPG provided efficient protection. The substitution of phenol increases the formaldehyde emission. While further reduction in formaldehyde in the resin admixture or formaldehyde scavengers may be required, the method described herein can be used to partly replace fossil-based phenol, while maintaining good fungal resistance.

Funder

Norges Forskningsråd

Forschungszentrum Jülich

Publisher

Walter de Gruyter GmbH

Link

https://www.degruyter.com/document/doi/10.1515/hf-2023-0119/pdf

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