Viscoelastic and Photoelastic Properties of Polystyrene above Its Softening Temperature

Abstract Creep, recovery, and stress-relaxation experiments with simultaneous measurements of birefringence have been carried out on polystyrene films above their softening temperature. The ratio of birefringence to stress is a constant independent of the stress, elongation, temperature, and molecular weight of the polystyrene. The data indicate that polystyrene has a semipermanent network structure. The network is most likely caused by the strong intertwining of the polymer molecules.

[1]  L. Nielsen,et al.  Influence of molecular weight on the properties of polystyrene. I. Mechanical properties of polystyrene films cast from solvents , 1949 .

[2]  Bryce Maxwell,et al.  Rheological Properties of Polystyrene below 80° C. , 1949 .

[3]  J. Marin,et al.  Creep and Damping Properties of Polystyrene , 1949 .

[4]  P. Flory,et al.  Dependence of elastic properties of vulcanized rubber on the degree of cross linking , 1949 .

[5]  A. Tobolsky,et al.  Some studies of plasticized polyvinyl chloride , 1949 .

[6]  A. Tobolsky,et al.  Plasticized Polyvinyl Chloride: Structure and Mechanical Behavior , 1949 .

[7]  A. Tobolsky,et al.  An Investigation of the Relationship Between Polymer Structure and Mechanical Properties , 1949 .

[8]  P. Flory,et al.  Viscosity—Molecular Weight and Viscosity—Temperature Relationships for Polystyrene and Polyisobutylene1,2 , 1948 .

[9]  A. Tobolsky,et al.  An Investigation of the Relationship Between Polymer Structure and Mechanical Properties , 1948 .

[10]  R. Buchdahl.  Rheology of thermoplastic materials; polystyrene. , 1948, Journal of colloid science.

[11]  R. S. Spencer,et al.  The viscous flow of molten polystyrene. , 1948, Journal of colloid science.

[12]  A. Tobolsky,et al.  An Investigation of the Relationship Between Polymer Structure and Mechanical Properties , 1948 .

[13]  T. Alfrey.  Mechanical behavior of high polymers , 1948 .

[14]  L. Treloar.  The photo-elastic properties of rubber. Part I: Theory of the optical properties of strained rubber , 1947 .

[15]  H. Nason.  A High Temperature, High Pressure Rheometer for Plastics , 1945 .

[16]  P. Flory.  Network Structure and the Elastic Properties of Vulcanized Rubber. , 1944 .

[17]  N. Foote.  Thermoplastic Flow of Polystyrene , 1944 .

[18]  F. E. Wiley.  Working-Range Flow Properties of Thermoplastics , 1941 .

[19]  J. R. Katz.  X-ray spectrography of polymers and in particular those having a rubber-like extensibility , 1936 .