CONTINUOUS METHOD FOR OBTAINING OF NOVOLAC OLIGOMER AND MIXED COPOLYMER IN MELT

Zaza Molodinashvil Zaza Molodinashvil,Marina Chikaidze Marina Chikaidze,Nikoloz Zazashvili Nikoloz Zazashvili,Dali Razmadze Dali Razmadze,Michaeli Tchichakua Michaeli Tchichakua

doi:10.31435/rsglobal_ws/30082018/6067

Zaza Molodinashvil Zaza Molodinashvil, Marina Chikaidze Marina Chikaidze + Show 3 more

Open Access

https://doi.org/10.31435/rsglobal_ws/30082018/6067

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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.

Highlights

Since the beginning of the XX century, phenolic resins belonging to the class of thermoreactive polymers have found wide application in almost all fields of national economy due to their valuable properties
Phenol-formaldehyde polymers are widely used in the form of polymeric compositions in which the main role is played by excipients
As there was no information in literature about the character of the course of the reaction between phenol and paraform in the melt, and as well to establish optimal conditions of the synthesis of the novolactype oligomer in the melt, we studied some kinetic regularities of oligomer formation [20]

Summary

Introduction

Since the beginning of the XX century, phenolic resins belonging to the class of thermoreactive polymers have found wide application in almost all fields of national economy due to their valuable properties. A continuous method for obtaining of novolac by interaction of phenol and formaldehyde in melt is developed. Reaction was carried out in melt, by heating of paraform and phenol in the presence of acid, catalyst (Fig.1).

Results

Conclusion