to be a promising substitute for phenol in phenol-formaldehyde (PF) resin synthesis, given
the increasing concerns of the shortage of fossil resources and the environmental impact
from petroleum-based products. One hurdle that prevents the commercial utilization of lignin
is its low reactivity due to its chemical structure. Many efforts have been made to improve its
reactivity by modification and/or depolymerization of lignin molecules. Methylolation and …