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α- and β-crystalline forms of isotactic polypropylene investigated by nanoindentation

Abstract : Under special crystallization conditions from the melt, both α- and β-forms of isotactic polypropylene were produced simultaneously. The α- and β-spherulites of polypropylene were differentiated under optical microscope, allowing the nanoindentation of individual spherulites of each crystallographic form. Elastic modulus and hardness of β-spherulites were found to be 10 and 15% respectively lower than in α-spherulites. The higher stiffness of α may be related to the particular interlocked structure with cross-hatched lamellae, and to a lower molecular mobility in the crystallites.
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Thomas Labour, Laurent Ferry, Catherine Gauthier, Philippe Hajji, Gérard Vigier. α- and β-crystalline forms of isotactic polypropylene investigated by nanoindentation. Journal of Applied Polymer Science, Wiley, 1999, 74 (1), pp.195-200. ⟨10.1002/(SICI)1097-4628(19991003)74:1<195::AID-APP24>3.0.CO;2-8⟩. ⟨hal-03272048⟩

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