CONTINUOUS METHOD FOR OBTAINING OF NOVOLAC OLIGOMER AND MIXED COPOLYMER IN MELT
Journal Title: World Science - Year 2018, Vol 2, Issue 8
Abstract
A new continuous method for production of novolac-type oligomers by interaction of phenol with paraform in the melt in the presence of acid catalyst was developed. To establish the optimal conditions of the reaction, some kinetic regularities of the process were investigated. It is shown that the reaction is of the second order. The optimal conditions for formation of the oligomer are the following: temperature – 100-1200C; duration of the reaction – 10 min; phenolic component: formaldehyde molar ratio – 1.15:10; amount of the catalyst – 1% in relation to the phenolic component. Also, to enhance the heat resistance of the polymers, complex polymers with statistical arrangement of monomers in the macromolecule were synthesized by simultaneous condensation of phenol and card-type bisphenols in the melt. The softening temperature of co-oligomers was increased from 70 0C to 90-180 0C.
Authors and Affiliations
Zaza Molodinashvili, Nikoloz Zazashvili, Michaeli Tchichakua, Marina Chikaidze, Dali Razmadze
Keywords
Related Articles
- EP ID EP545609
- DOI 10.31435/rsglobal_ws/30082018/6067
- Views 119
- Downloads 0
КАЧЕСТВО АДМИНИСТРАТИВНЫХ УСЛУГ: ПРОБЛЕМЫ ТЕОРИИ И ПРАКТИКИ
The article is sanctified to the pressing questions of quality of administrative services in Ukraine. Certain aspects of the quality of administrative services are examined taking into account the experience of the Europ...
ПОВЫШЕНИЕ УСТОЙЧИВОСТИ СТЕРЖНЯ ЗА СЧЕТ ИЗМЕНЕНИЯ ДЛИНЫ
The article considers a two-span rod, hinged at its ends on rigid supports and reinforced with an intermediate elastic support, compressed by an axial force constant along the length of the rod. The influence of a change...
ПРАЦЕТЕРАПІЯ ЯК ОДИН З МЕТОДІВ ПСИХОТЕРАПЕВТИЧНОЇ ДОПОМОГИ НА ПОДІЛЛІ В КІНЦІ ХІХ – ПОЧАТКУ ХХ СТОЛІТТЯ
The articledescribes the activities of the employees of O.I.Yushchenko psychiatric hospital in Vinnytsa, who helped improve the organizational structureof the psychiatric andpsychological assistance, promoted labor psych...
METHOD FOR DETERMINING THE FATIGUE INDICATOR FOR MONOLITHIC ROAD-BUILDING MATERIALS
The paper offers a method for making specimen prisms. It also suggestsa technique for the procedure of determining the fatigue indicator, with cyclic loads applied to monolithic road building materials, by using the crit...
ПРОИЗВОДСТВО И ПОВЫШЕНИЕ КОНКУРЕНТОСПОСОБНОСТИ РАСТИТЕЛЬНОГО МАСЛА
The article reveals the definition of the competitiveness of products of fat and oil industry, examines the criteria for the competitiveness of vegetable oils, and also analyzes the factors shaping demand and stimulating...