The aim of the study was to study the conditions of copolycondensation of phenol alcohol with hydroxyl-containing polyether polyol in the presence of maleic anhydride chain extender in order to obtain modified thermoset phenolic-formaldehyde oligomers. Investigation of the dependence of the content of free phenol, formaldehyde and methylol groups on time during the synthesis of the modified phenol-formaldehyde resin with the ratios hydroxyl-containing polyether polyol:phenol alcohol 1:60 mol/mol and 1:100 mol/mol. It was revealed that maleic anhydride, present in the reaction medium as a copolycondensation catalyst, also participates in copolycondensation reactions as a chain extender. Moreover, as the molar fraction of phenol alcohol increases in the synthesis, an increase in the amount of maleic anhydride involved as a chain extender and an increase in the molecular weight of the resulting modified phenol-formaldehyde oligomer are observed.
Farkhad, MAGRUPOV; Sherali, UMAROV; Murodjon, TOHIROV; and Zukhra, RADJABOVA
"THE RESEARCH OF CONDITIONS FOR THE FORMATION OF PHENOL FORMALDEHYDE RESINS MODIFIED WITH HYDROXYL CONTAING POLYETHER POLYOL,"
CHEMISTRY AND CHEMICAL ENGINEERING: Vol. 2020
, Article 11.
Available at: https://uzjournals.edu.uz/cce/vol2020/iss2/11