Abstract
The extensional and fractural properties were measured for concentrated solutions of polystyrene over wide ranges of extension rate and temperature. From stress—strain curves failure parameters such as failure stress σf and failure strain γf fractural parameters such as breaking stress σb and breaking strain γb, and extensional parameters such as time dependent maximum extensibility n(t)1/2 and extensional modulus E(t) were evaluated and compared with those of bulk polystyrenes. The dependence of these parameters on the concentration was also discussed. The height of the rubbery plateau, EeN°, in the time curves of the elongational modulus is proportional to (ρsw)−2, where ρs is the density of solution and w is the weight fraction of polymer in solution. This result is consistent with the previous results of our dynamic viscoelastic measurements for polystyrene solutions. The master curves of n(t)1/2 show a concentration dependence in the plateau region and are similar in shape to the master curves of the draw ratio at the breaking point, λb, in the short time scale region below the maximum λb. This result indicates that the master curve of λb on the short time scale side below the maximum point may obey the stored energy constant criterion for fracture. The variation of the γb with time depends upon polymer concentration and also shows a much sharper maximum compared with that for the bulk polystyrenes in the intermediate rate region. Such a very sharp maximum is characteristic of solutions.The concentration dependence of the failure envelope, the average molecular weight Me and the chain length Ze between entanglement loci were also discussed.
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Kamei, E., Onogi, S. Extensional and Fractural Properties of Concentrated Solutions of Monodisperse Polystyrene at Elevated Temperatures. Polym J 8, 347–362 (1976). https://doi.org/10.1295/polymj.8.347
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DOI: https://doi.org/10.1295/polymj.8.347
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