Polymorphism of Isotactic Poly(1-butene) as Revealed by Microindentation Hardness. 1. Kinetics of the Transformation

descriptionPublicationkeyboard_double_arrow_right Article 25 Oct 2002 Spain, Italy English Publisher:American Chemical Society (ACS)Journal:Macromolecules, volume 35, pages 9,069-9,073 (issn: 0024-9297, eissn: 1520-5835,

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Authors: AZZURRI, FIORENZA; FLORES A.; ALFONSO, GIOVANNI CARLO; BALTA' CALLEJA F. J.;

doi: 10.1021/ma021005e

handle: 10261/237857 , 11567/208050

Polymorphism of Isotactic Poly(1-butene) as Revealed by Microindentation Hardness. 1. Kinetics of the Transformation

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Abstract

The microindentation hardness technique has been employed to examine the II → I polymorphic transformation of i-PBu1 taking place upon aging at room temperature. The hardness values of form I are shown to be remarkably higher than those of form II due to the denser packing of chains in the hexagonal crystal modification. The kinetics of the II → I transformation has been followed by means of microindentation hardness measurements in real time. The influence of molar mass and crystallization temperature on the kinetics of the polymorphic transformation is examined. Results suggest that the rate of polymorphic transformation is independent of molecular weight. In addition, it is seen that increasing the crystallization temperature (up to 105 °C) notably reduces the time required for a full transformation of form II into form I. The influence of the fraction of amorphous material on the rate of polymorphic transformation is discussed.

5 pags.7 figs.

Countries

Spain, Italy

Related Organizations

University of Genoa
Italy
Spanish National Research Council
Spain
Institute for the Structure of Matter
Spain

Keywords

Microhardness, Small angle X-ray scattering nanostructure., Polymorphism, Isotactic polybutene-1

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