Structural deformation properties of organic fibers based on para-polyamides

Conclusion

On the basis of x-ray analytical data it has been established that the studied material has a liquid crystal type structure. In the direction along the fiber axis there is a further degree of ordering; in the radial direction further order is not observed. The dependence of the microdeformation on the deformation of the sample and external loading was studied from the change in the diffraction picture during loading. It was established that ε _μ is directly proportional to ε. The closeness of ε _μ and ε indicates a uniformity of the material in the structure relationship. It is suggested that the deformation mechanism of the given material is similar to the deformation mechanism of some materials of similar chemical structure which have been considered in the literature. It has been established that after loading the material retains a residual deformation both at the macro- and the microlevels. After thermal treatment the residual microdeformation disappears. It is assumed that ε ^resid _μ arises due to a partial fixation of the stretched state of the chains by strong intermolecular interaction. Small-angle diffraction provides little information with respect to studying the fracture and structure of the material. The experiments carried out may be lacking in some undetermined regimen of loading — in which during recording of the reflection (∼10 min) relaxation of the stress on the sample and creep occurs. However, qualitatively this cannot influence the results obtained.