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Erschienen in:
2001 | OriginalPaper | Buchkapitel
Supermolecular Structure and Mechanical Behaviour of Isotactic Polypropylene
verfasst von : M. Raab, J. Kotek, J. Baldrian, W. Grellmann
Erschienen in: Deformation and Fracture Behaviour of Polymers
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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The kinetic theory of rubber elasticity has successfully explained the macroscopic mechanical behaviour of polymer networks starting from the thermodynamics of individual molecules [1]. This approach, however, cannot be applied to semicrystalline polymers, where several levels of structural hierarchy can be distinguished, starting from molecular architecture and going up to supermolecular morphology and the macroscopic geometry of a body. Four basic levels of structural hierarchy in isotactic polypropylene are schematically shown in Fig. Bl [2]. In the case of rubber-modified polypropylene, the embedded rubber particles form an additional structural level. The individual structural levels reflect not only the composition but also the thermal and deformation history of the material.