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

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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.

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Advanced Polymer Science and Engineering View Preview

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Periodical:

Advanced Materials Research (Volume 221)

Pages:

54-59

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.221.54

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Online since:

March 2011

Authors:

Bin Zhang, Jing Bo Chen, Bi Wei Qiu, Fang Fang Ji, Chang Yu Shen

Keywords:

Cylindritic Structure, Draw Ratio, Spherulitic Structure, β-iPP

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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