Paper Title:
Influence of Draw Ratio on Crystal Morphology and Structure of β-Form of Isotactic Polypropylene
  Abstract

The effects of the draw ratio (DR) on the polymorphic nature of β-iPP were investigated by polarized light microscopy (PLM), wide angle X-ray diffraction (WAXD), small angle X-ray scattering (SAXS) and differential scanning calorimeter (DSC). The iPP sheet is extruded through a slit die, and then the extruded sheets were hot stretched with the different draw ratio (DR). DSC and WAXD results indicate that the β-iPP content increase with DR increasing from 4.8 to 10.8. β-spherulites can be observed by PLM in the stretched specimen even at a lower DR (4.8). With increasing draw ratio, the relative amount of the β-cylindrites crystals gradually increased.

  Info
Periodical
Edited by
Chuansheng Wang, Lianxiang Ma and Weiming Yang
Pages
54-59
DOI
10.4028/www.scientific.net/AMR.221.54
Citation
B. Zhang, J. B. Chen, B. W. Qiu, F. F. Ji, C. Y. Shen, "Influence of Draw Ratio on Crystal Morphology and Structure of β-Form of Isotactic Polypropylene", Advanced Materials Research, Vol. 221, pp. 54-59, 2011
Online since
March 2011
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