PHYSICO-CHEMICAL FEATURES OF MODIFICATION OF FI-BROUS MATERIALS BY ORGANOSILANE FINISHES

UMRQWT

Abstract

Modification of fibrous fillers with organosilane finishes is an effective way of directional regulation of adhesive interaction between components of composite materials. The chemical composition and character of the surface, mechanical properties and wetting of modified reinforcing systems - polyacrylonitrile technical flagellum, hydrate cellulose technical thread and basalt threads, solutions of organosilane finishes are investigated in this work: AGM-9, A-187 and A-174. Studies of samples of modified fibrous materials were carried out using methods of infrared spectroscopy, scanning electron and optical microscopy, mechanical tests and evaluation of their wettability. On the spectra of modified filaments, peaks characteristic of the groups included in the modifiers are identified, which suggests a physicochemical interaction between the functional groups of organosilanes and hydroxyl groups of fibrous materials, an additional confirmation of which is the results of thermal moisture treatment. It is established that a uniform film coating is formed on the surface of the modified elementary filaments. The results of mechanical tests of modified fibrous materials indicate a significant improvement in strength compared to unmodified fibrous materials: the relative breaking load of the PAN-TF increases by an average of 44 %, HCTT - by 52 %, BT – by 42 %. A comparative analysis of the wetting of mo­dified reinforcing systems with an epoxy oligomer was carried out, indicating the effective effect of organosilanefinishes on increasing the maximum height of the capillary rise of the boundary of the epoxy oligomer solution and the average wetting rate of the threads. Evaluation of kinetic wetting data of modified reinforcing systems has shown that A-174 is the most effective organosilane that improves adhesion compatibility in the matrix/filler system. The physico-chemical features of the modification of fibrous materials by organosilanefinishes are formulated.