UNI-MB - logo
UMNIK - logo
 
(UM)
  • Determination of the orientation of crystallites in PET fibres
    Sfiligoj-Smole, Majda ; Zipper, Peter
    A method for the determination of the average angle of orientation of crystallites ▫$\varphi$▫ from the azimuthal record of the meridional reflection of the ▫$\bar{1} 05$▫ diatropic plane for PET ... fibres is widely used. The ▫$\bar{1} 05$▫ reflection is the closest to the meridian and the normal to this plane making an angle of approximately 10° with c axis. The intensity distribution measured by this method reflects the distribution of the ▫$\bar{1} 05$▫ plane normals and therefore it comprises: the distribution of the ▫$\bar{1} 05$▫ plane normals relative to the c crystalographic axis, the distribution of the crystallites relative to the reference fibre axis and the tilted orinetation; that is the molecular chain axis inclined by some degrees with respect to the fibre axis. By the studying of the diffraction intensity distribution from the ▫$\bar{1} 05$▫ diatropic plane this particularity should be taken into account. The sub-meridional reflection was scanned in two different geometries: omega and chi scan. Supercritical CO@ as an alternative dyeingmedium changes the fibre structure to a certain extent independence on the treatment temperature and pressure used. Therefore the cahnges of crystalline orinetation in poly(ethylene terephtalate) (PET) fibresas brought about under the influence of supercitical CO2 were investigated.
    Vir: International journal of polymeric materials. - ISSN 0091-4037 (Vol. 47, 2000, str. 681-691)
    Vrsta gradiva - članek, sestavni del
    Leto - 2000
    Jezik - angleški
    COBISS.SI-ID - 5847062

Vnos na polico