SYNTHESIS AND PROPERTIES OF BORON-CONTAINING OLIGOMERS BASED ON HYDROQUINONE AND BORIC ACID

SYNTHESIS AND PROPERTIES OF BORON-CONTAINING OLIGOMERS BASED ON HYDROQUINONE AND BORIC ACID Научная публикация

Журнал

Известия высших учебных заведений. Серия: Химия и химическая технология
ISSN: 0579-2991 , E-ISSN: 2500-3070

Вых. Данные

Год: 2020, Том: 63, Номер: 4, Страницы: 4-11 Страниц : 8 DOI: 10.6060/ivkkt.20206304.6116

Ключевые слова

hydroquinone; boric acid; polyesters; polymethylene esters; heat resistance; curing; NMR-spectra

Авторы

Lenskiy M.A. ^1,2 , Shults E.E. ³ , Korabel'nikov D., V ² , Ozhogin A., V ² , Novitskiy A.N. ^1,2

Организации

1	(Данные Web of science) RAS, Lab Med Chem, Inst Problems Chem & Energet Technol, Siberian Branch, Socialist St 1, Biisk 659322, Russia
2	(Данные Web of science) Altay State Tech Univ, Dept Chem Technol Energy Saturated Mat & Prod, Biysk Technol Inst, Trofimova St 27, Biisk 659305, Altai Region, Russia
3	(Данные Web of science) RAS, Lab Med Chem, Novosibirsk Inst Organ Chem, Siberian Branch, Akademika Lavrentieva Ave 9, Novosibirsk 630090, Russia

By polyesterification of boric acid with hydroquinone in o-xylene with azeotropic distillation of water, polyesters of hydroquinone and boric acid are obtained. By adding equimolar amounts of phenol to the reaction between boric acid and hydroquinone, a mixed polyester of hydroquinone, phenol and boric acid is obtained. From the ratio of the integral intensity of phenol protons to hydroquinone protons, it was found that the addition of phenol to the hydroquinone polydiester and boric acid occurs by 80%. The synthesized polyesters reacted with formaldehyde using o-xylene as a solvent and a boron trifluoride etherate catalyst. By the method of end groups it was determined that all the compounds obtained have a small molecular weight and belong to the class of oligomers. The structure of the synthesized oligomers was confirmed by elemental analysis, IR and NMR (H-1, C-13) spectroscopy. All compounds obtained have a good adhesion to glass, wood and metal. The thermal destruction of samples in a flow of nitrogen at 900 degrees C was studied, the residual mass for polyesters is from 49 to 53%, for polymethylene ester - from 18.5 to 31%. The residual mass during thermo-oxidative degradation in an air flow at 600 degrees C for polyesters is from 62 to 65%, for polymethylene ester from 37 to 44%. The reaction of the modification of synthesized oligomers with a sulfur curing system and epoxy resin was studied. The maximum content of insoluble gel fraction when cured by sulfuric system at a temperature of 220 degrees C reaches 94% for polymethylene diester hydroquinone and boric acid, the minimum is 68% for the polytriester of hydroquinone and boric acid. The maximum content of insoluble gel fraction when cured with epoxy resin at a temperature of 150 degrees C for polyesters is in the range 52 - 66 %, for polymethylene ester 50 - 61%.

Lenskiy M.A. , Shults E.E. , Korabel'nikov D.,.V. , Ozhogin A.,.V. , Novitskiy A.N.
SYNTHESIS AND PROPERTIES OF BORON-CONTAINING OLIGOMERS BASED ON HYDROQUINONE AND BORIC ACID

Известия высших учебных заведений. Серия: Химия и химическая технология. 2020. V.63. N4. P.4-11. DOI: 10.6060/ivkkt.20206304.6116 WOS Scopus РИНЦ

Полный текст от издателя

Опубликована online:

16 апр. 2020 г.

Web of science	WOS:000528251300001
Scopus	2-s2.0-85088029094
РИНЦ	42710731
OpenAlex	W3029040218