The production of dissolving grade pulp necessitates the removal of hemicellulose from biomass. The resulting prehydrolysis liquors are currently incinerated at low efficiency, hampering pulp production. Herein, the preparation and characterization of a polymer synthesized from hemicellulose derived monomers is described, offering an alternative to incineration. The polymer was prepared without solvent at room temperature, with an acid catalyst, which afforded quantitative yields. Flame-retardant properties were achieved through the use of sulfonic acids in catalytic amounts. The adhesive properties of the polymer on various substrates demonstrates that this polymer may serve as a versatile flame-retardant coating. The polymerization mechanism and polymer structure were investigated through the use of kinetic experiments. A comparative life-cycle assessment (LCA) was used to evaluate our valorization approach, in addition to a LCA on this transformation, which both showed improvements in several impact categories.