Polystyrene plane strain compression

Figure 19.1 Thin sections cut from specimens deformed just beyond the yield point in plane-strain compression viewed through crossed polarizers in the optical microscope, (a) Microshear bands formed in polystyrene, (b) Diffuse shear bands formed in poIy(methyl methacrylate). (Reproduced with permission from ref. 2.)...

Fig. 5.38 Shear bands in polystyrene deformed in plane strain compression (courtesy Dr. R.J. Oxborough).

To our knowledge, very few results have been published concerning the morphology of star SB copolymers. In 1975, Pedemonte et al,153) studied two copolymers (SB)4Si called Europrene T 161 and Europrene T 162 containing, respectively, 35% and 49% polystyrene. For the annealed samples, a disordered cylindrical structure was found in T 161 and a lamellar structure in T 162. In 1976, Pedemonte et al.ls4) published the results of a more detailed study performed on compression-moulded films of T 162. These films deformed increasing step by step the maximum strain value exhibit the Mullins effect. If in the original compression moulded film rods of polystyrene were arranged almost perpendicular to the compression plane, the de-... 

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