Physicochemical principles of limited-stage technology for fibre composite materials for different functional applications

The Properties of Products and the Governing Laws of the Process of Grafting Acrylic Acid to Polypropylene Fibre. Part 2

“…Thus, methods have been developed that are based on changing the surface structure and the structure of fi brous materials and the reinforcing system as a whole, including the synthesis of oligomers, the impregnation of fi bre systems with oligomers, drying, the preparation of moulding material, the compression moulding of articles, and their heat treatment. It is clear that the main shortcoming of procedures of this kind is, above all, the multistage nature of production of the material, which entails complication of the production process, an increase in the cost of the end-product, and so on [2].…”

Ion-Exchange Composites Based on Modified Polypropylene Strands Produced by Polycondensation Filling

“…The use of polycondensation fi lling made it possible to develop fi brous ion-exchange materials based on polyacrylonitrile and viscose fi bres, and also hybrid systems with the use of these fi bres [6,7], which have performed effectively as materials for the purifi cation of industrial waste waters [8,9]. These materials include fi brous cation-exchange materials (FCEMs) based on profi led polypropylene (PP) strands [10], for the production of which use was made of PP strands with a changed cross-sectional geometry, differing from roundcross-section strands in an increased specifi c surface and volume, and better sorption and adhesion properties.…”

Process Features of the Polycondensation Filling of Polymer Composites Based on Profiled Polypropylene Threads

“…In the 1370-1200 cm -1 region there are wagging and torsional vibrations of the CH groups, which strongly interact with each other. The absorption bands in the 1200-800 cm -1 region are due to interaction of pendular vibrations of the CH 3 and CH 2 groups with stretching vibrations of the carbon skeleton.…”