Effect of the drawing process on the thermal stability of gelatine-polyacrylonitrile graft copolymer fibres

The thermal stability of gelatine-polyacrylonitrile graft copolymers fibres obtained under various conditions of deformation has been studied. The the rmal properties of examined fibres depend on the synthetic component of the fibre forming material - polyacrylonitrile which appears in the form of gr afted PAN chains and PAN homopolymer. It was stated that the highest therma l stability have those fibres which formation process included two stages o f drawing with the use of deformation close to the maximal values, with the value of the total draw ratio amounting to 691%. It should be supposed tha t with such a drawing process, already in its first stage, are created adva ntageous conditions for the formation of paracrystalline regions to a large r extent and their orientation along the fibre axis.