PVC Fibers Research Articles

Change in properties of PVC fibers during prolonged heating

Change in properties of PVC fibers during prolonged heating

Effect of hot-drawing conditions on the orientation characteristics of carbon-chain fibers determined by the acoustic method

The orientation characteristics of polypropylene, polyacrylonitrile, and chlorinated PVC fibers, determined by the acoustic method, have been investigated in relation to the fiber drawing conditions (draw ratio, speed, and temperature). It is shown that there is a correlation between the mechanical characteristics and the degree of acoustic anisotropy.

Europe leads the way in 100% PVC fibers

Europe leads the way in 100% PVC fibers

MODIFICATION OF POLYVINYLCHLORIDE

Combination of morpholine ring into PVC molecules occured by heating or γ-ray radiation to PVC fiber in 70_??_90% aqueous morpholine.The affinity to dyes of thus modified PVC fiber is improved by oxidizing these fibers in aqueous chlorine or hydrogen peroxide solution to form a dyeable functional group >C=O, -OH.The forming of these functional groups seems to be induced by resonance of proton in PVC molecule due to the loan pair electron of nitrogen atom in morpholine ring combined with PVC.Thus treated fiber has an increased affinity for many basic and suspension dyes.

STUDIES ON POLYVINYL CHLORIDE FIBERS

We measured the creep of polyvinyl chloride fibers at 20°C and 40°C, and constructed the master creep curves by basing the key to the procedure for generalization upon O'Shughnessy's assumption that there exist an invariant pattern in logarithmic time for the entire delayed elongation process but that the time scale of the response, as well as its magnitude is dependent on stress.The characteristic retardation times, Log τ, plotted as function of stresses, decreased linearly as stresses increased. The instantaneous elastic elongation E0, plotted as function of stresses, increased linearly where stresses (S) were relatively small, but these relations between E0 and S deviate from linear relations where stresses were relatively large and these deviations suggested the structural change in PVC fibers. The reciprocals of scale factors, 1/f, plotted as function of stresses well indicate the stress dependence of retarded elastic deformation of PVC fibers.