A low frequency torsional rheometer
Previous work in the author’s laboratory has been largely concerned with the study of the visco-elastic properties of supercooled liquids and polymers of relatively low molecular weight (1, 2). Measurements on these materials can conveniently be made in the frequency range 104 to 109 Hz. In extending the scope of the research to include the study of high molecular weight polymers it has been necessary to develop apparatus to enable results to be obtained at lower frequencies. This paper describes an instrument which has been designed to measure the components of the complex shear modulus in the frequency range 10−3–50 Hz.
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