Vapor Phase Method for Preparation of Polyacrylonitrile Coated Cotton Yarn and Physical Properties of the Product

Abstract

Acrylonitrile vapors were polymerized within and upon the individual fiber surfaces of scoured cotton yarns to yield coated products having new and interesting properties. The uniformity of the polyacrylonitrile coating is shown in electron micrographs of the fiber surfaces. Breaking strengths were increased appreciably, particularly when the process was applied to prestretched yarns. High frictional characteristics were ex hibited when one coated yarn was pulled against another. Excellent resistance to rot and flat abrasion was obtained in conjunction with a relatively minor improvement in resistance to acid degradation. No essential change in heat and weather resistance was noted. Resistance to flexing, however, was adversely affected by the presence of the polyacrylonitrile. These polymer coated yarns can be prepared with essentially the same equipment and procedures as required for the vapor phase cyanoethylation of cotton ; the only exception is that a different catalyst is employed. This illustrates the utility of acrylonitrile for preparation of a variety of useful cotton products,