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Rheometry towards complex flows: Squeeze flow technique
Author(s) -
Laun Hans Martin
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920560107
Subject(s) - rheometry , creep , materials science , composite material , isothermal process , viscosity , constant (computer programming) , radius , mechanics , flow (mathematics) , deformation (meteorology) , wax , yield (engineering) , rheology , thermodynamics , physics , computer security , computer science , programming language
Disk‐like samples are submitted to controlled squeezing forces between parallel plates and the time‐dependent sample height is measured. Isothermal tests at constant force enable the determination of viscosity functions of melts. Experiments using a constant disk radius and a constant disk volume are compared. Creep and creep recovery tests are made possible by a height‐dependent control of the force. The evaluation of a pressure‐dependent yield stress is demonstrated for wax powder. The squeeze flow technique is of advantage for systems with a layer structure or matrices containing long fibres or mats. In non‐isothermal experiments on solidifying materials, either by crystallization or polymerization, the total deformation and the speed of solidification in processes like stamp moulding can be determined.