Some Trends in the Mechanical Characterization of Polymers
Because of the complex molecular mechanisms involved in the deformation of polymers, the variables of time and temperature assume much greater importance than they do in metals. An adequate description of the mechanical behavior of a polymer for engineering purposes must therefore include the effects of both these variables. Dynamic experiments, which have been used with such success by the physicist in the analysis of the structure of polymers, now hold out the promise of becoming a useful tool for the engineer. The results of such experiments may be expressed in terms of curves of storage and loss moduli as functions of time (frequency) and temperature, and a number of interesting ways have been proposed in which the engineer can use these curves. Studies are underway, both in Europe and America, aimed at reducing experimental difficulties and setting up standard test procedures. At the same time progress is also being made in the improvement of the more conventional types of tests.
KeywordsMechanical Characterization Dynamic Experiment Secondary Transition Torsion Pendulum Standard Test Procedure
Unable to display preview. Download preview PDF.
- 1.H. Leaderman, Elastic and Creep Properties of Filamentous Materials and other High Polymers, Textile Foundation, 1943.Google Scholar
- 2.C. W. Richards, Engineering Materials Science, Wadsworth Publishing Company, Inc., San Francisco, 1961, p. 31.Google Scholar
- 7.J. D. Ferry, Viscoelastic Properties of Polymers, John Wiley & Sons, Inc., New York, 1961.Google Scholar
- 8.A. J. Staverman and F. Schwarzl, in H. A. Stuart, Die Physik der Hochpolymeren, IV, p. 87, Springer-Verlag, Berlin, 1956.Google Scholar
- 9.H. A. K. Eden, Plastica 13, 1108 (1960).Google Scholar
- 10.J. Heyboer, Kunstoffe 50, 23–26 (1960).Google Scholar
- 11.P. Dekking, Determination of Dynamic Mechanical Properties of High Polymers at Low Frequencies, Doctoral Thesis, University of Leiden (1961).Google Scholar
- 13.R. F. Westover and W. C. Warner, Materials Research and Standards 1, 867–871 (1961).Google Scholar