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Non‐Standard Transverse Deformation of a Crystalline Lattice Induced by the Application of Tensile Stress
Author(s) -
Auriemma Finizia,
De Rosa Claudio,
Caliano Ludovica,
Corradi Marco
Publication year - 2008
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200800164
Subject(s) - materials science , ultimate tensile strength , composite material , thermoplastic elastomer , elastomer , rigidity (electromagnetism) , transverse plane , tacticity , lattice (music) , phase transition , copolymer , condensed matter physics , structural engineering , polymer , physics , acoustics , engineering , polymerization
A reversible stress‐induced phase transition occurs by stretching syndiotactic copolymers of propene and 1‐butene with 1‐butene content higher than 70 mol‐%. It involves a non‐standard mode of distortion of the crystalline lattice in a direction transverse, rather than parallel, to the applied tensile stress. We demonstrate that this distortion reflects conformational and crystallographic restraints on the slip processes involved at high deformations. This transition plays an important role in the elasticity of this novel class of thermoplastic elastomers, which show rigidity and mechanical strength two orders of magnitude higher than those of conventional elastomers.