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.
| Mualliflar | Farkhad, MAGRUPOV, Sherali, UMAROV, Murodjon, TOHIROV, Zukhra, RADJABOVA |
|---|---|
| Jurnal | Kimyo va kimyo texnologiyasi |
| Nashr sanasi | 2020-06-20 |
| Betlar | 52-56 |
| Til | en |
| DOI | 10.51348/rrzs6230 |
DOI: 10.51348/rrzs6230 · Maqolaning asl sahifasi
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