AbstractAbout 25 of the surface area of Mexico is covered by the shrubLarrea tridentata, also known as creosote bush. Therefore, an intense study of the shrub as a source of industrial raw materials was started. Presently, we have studied the polymerization of the phenolic resin ofLarreawith formaldehyde. This polymerization has been carried out in bulk and in aqueous suspension with acid catalysts such as oxalic and hydrochloric acids. The molar ratio ofLarrearesin/formaldehyde was 1/1, 1/3, and 1/4 at different reaction times.Larrearesin and the formaldehyde condensation products were characterized by gel permeation chromatography (GPC), proton nuclear magnetic resonance (NMR), and vapor pressure osmometry (VPO).
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