Influence of Draw Ratio on Crystal Morphology and Structure of β-Form of Isotactic Polypropylene

Abstract:

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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.

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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 et al., "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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$35.00

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