Abstract
To clarify the internal texture of the drawn fiber made from milkcasein-acrylonitrile graft copolymer (PM-fiber), the microscopic observations were carried out by using the electron microscope and the optical microscope. The following results were obtained:
1) Skin and core layers are formed in the cross section of the fiber as well as the many characteristic “streaks” on the fiber surface.
2) Skin and core layers are distinguished only by the density of texture because in core layer the more micro voids are contained than in skin layer, but not distinguished by the ratio of milkcasein (MC) and polyacrylonitrile (PAN), crystallinity, the order and the orientation of crystalline part.
3) MC in PM-fiber distributes uniformly into the medium of PAN with the order less than 200Å. In the fiber obtained by blending MC and PAN, many aggregations of MC are observed as the column like particles with the about 1000Å length and the about 300-500Å diameter. From this facts the uniform distribution of MC molecule in PM fiber will arise from that MC-molecule uniformly dispersed into acrylonitrile (AN) monomer at the graft copolymerization process.
4) The difference is not found between the cross linked type and non-cross linked one of PM-fiber.
