Non-Standard Transverse Deformation of a Crystalline Lattice Induced by the Application of Tensile Stress

作者：Auriemma Finizia^*; De Rosa Claudio; Caliano Ludovica; Corradi Marco

来源：Macromolecular Materials and Engineering, 2008, 293(10): 810-814.

DOI：10.1002/mame.200800164

• diffraction analysis
• elastomers
• mechanical properties
• phase behavior
• polyolefins
• sernicrystalline polymers

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.

• 出版日期2008-10-10