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Polymerization studies of creosote bush ( Larrea tridentata ) phenolic resin with formaldehyde
Author(s) -
Belmares Hector,
Barrera Arnoldo
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070240614
Subject(s) - larrea , vapor pressure osmometry , formaldehyde , polymerization , creosote , chemistry , gel permeation chromatography , phenylacetylene , nuclear chemistry , polymer chemistry , organic chemistry , catalysis , shrub , vapor pressure , botany , biology , polymer
Abstract About 25% of the surface area of Mexico is covered by the shrub Larrea 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 of Larrea with 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 of Larrea resin/formaldehyde was 1/1, 1/3, and 1/4 at different reaction times. Larrea resin and the formaldehyde condensation products were characterized by gel permeation chromatography (GPC), proton nuclear magnetic resonance (NMR), and vapor pressure osmometry (VPO).