Study on Shape Memory Properties of Polynorbornene/Microcrystalline Wax Materials

Key Words:COMPOSITES; POLYMERS; STRATEGY

Abstract:Polynorbornene (PNB) is a kind of smart material with excellent shape memory performance. The appearance of PNB is powder, so it can only be processed by adding plasticizing oil. In order to broaden its processing method and avoid environmental pollution caused by aromatic oils containing benzene, microcrystalline wax (MW) can be used as a better choice for plasticizing oil. Therefore, PNB/MW materials were prepared by using PNB as the matrix and adding microcrystalline wax with different contents. The basic properties of PNB/MW materials were studied by Shore D hardness tester, polarizing microscope, differential scanning calorimeter (DSC), universal electronic tensile testing machine and dynamic mechanical analysis (DMA). The dual-shape memory and reversible plasticity shape memory properties of PNB/MW materials were studied by DMA-Q800. The results showed that the glass transition temperature (T-g) of PNB is adjusted to near room temperature by microcrystalline wax, which was beneficial to the reversible plasticity deformation. So MW could replace treated distillate aromatic extract (TDAE) for the processing of PNB because of its non-pollution. The elongation at break of PNB/MW materials was more than 200%, and the tensile strength was high. The high elongation at break was beneficial to the deformation and recovery of the shape memory. In addition, the wide solid-liquid transition of microcrystalline wax also played the role of reversible phase, which made the recovery process controllable. The movement of PNB chain segment was limited by solid microcrystalline wax, which contributed to the fixation process of reversible plasticity shape memory. It was concluded that PNB/MW50 had excellent dual-shape memory and reversible plasticity shape memory performance.

Volume:51

Issue:10

Translation or Not:no