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Phenol-formaldehyde (PF) is a thermosetting resin that is widely used in many fields. One of its important applications is as an adhesive for woodbased panels manufacturing. In this research work, modified phenolformaldehyde resins were prepared using hydroxymethylated alkaline rice straw lignin as a substitute for petroleum-based phenol in the range of 20 to 50% by weight. The molar ratios of sodium hydroxide to phenolmodified alkaline lignin and the formaldehyde to phenol-modified alkalinedoi:10.15376/biores.13.4.8061-8075 fatcat:jdbeqwcaine5vkwa6jv6rkre2m