ФТТ, 2005, том 47, выпуск 5

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The role of chain length and conformation in stress-transmission and fracture of thermoplastic polymers

Hans-HenningKausch-Blecken von Schmeling

Institute of Materials, Swiss Federal Institute of Technology Lausanne (EPFL),
CH-1015 Lausanne, Switzerland
E-mail: hans-henning.kausch@epfl.ch

In this presentation a review of the molecular aspects of fracture is given, a subject that was pioneered by S.N. Zhurkov and his collaborators. Particular attention will be paid to the mechanisms of stress transfer onto straight chain segments, the role of chain interpenetration in establishing interfacial strength during crack healing, to the concept of taut tie-molecules, to stress distribution in UHMWPE fibres, and to the possible role of chain ruptures in the deformation process of fibres. Using Raman microscopy it is observed that some chains are exposed to stresses of up to 10 GPa, which is close to their estimated strength. From these experiments a mechanical model of the organization of almost fully oriented UHMWPE fibres is developed accounting also for the presence of numerous and dispersed defects. The principal deformation mechanisms are chain slippage, crystal plasticity and intra- and intermicrofibrillar slippage.

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