Premium
On the origin of order‐disorder in drawn polyacrylonitrile
Author(s) -
Hinrichsen Georg
Publication year - 1973
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1973.070171106
Subject(s) - polyacrylonitrile , superstructure , spinning , materials science , clearance , annealing (glass) , fiber , composite material , polymer chemistry , polymer , physics , thermodynamics , medicine , urology
Drawn polyacrylonitrile can be characterized only insufficiently with regard to its molecular and supermolecular structures which substantially determine the physical properties. This paper points out that the so‐called “superstructure” of polyacrylonitrile fibers can be cleared up after suitable thermooxidative treatment using x‐ray small‐angle scattering technique. The chemical reactions during the thermo‐oxidative treatment lead to a “self‐contrasting” effect so that the fibers as such are severely damaged yet information about the supermolecular structure can be obtained. The investigations show that changes in the course of fiber production (spinning, drawing, and annealing processes) affect alterations of the superstructure. The described method of investigation represents a so far unknown possibility for the purpose of detecting the supermolecular structure of drawn polyacrylonitrile.