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Keywords:

  • biaxiality;
  • crystallization;
  • drawing;
  • orientation;
  • polystyrene

Abstract

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The orientation developed in biaxially stretched sPS (BoSPS) films before and after crystallization is studied using XRD and FT-IR. On BoSPS films, thermal treatment induces crystallization into the trans-planar α-crystalline phase and a “planar” crystalline phase orientation is observed. In contrast, solvent treatments on BoSPS films induce crystallization into the helical δ-crystalline phase, representing the first example of a polymeric framework that is able to absorb low-molecular-mass guest molecules from water and air at low activities and that is promising for applications in chemical separation or water purification applications; in this case a high degree of a//c// “uniplanar” crystalline phase orientation is observed.