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<p>Shape-memory materials (actuators) with rapid thermally activated responses have been developed using amorphous glassy poly(ethylene terephthalate) (PET) films and fibers modified via cold longitudinal rolling. Heating to the PET glass-transition temperature (<i>T</i><sub>g</sub> = 83°C) was accompanied by 100% full shape recovery. This rolling – recovery process can be repeated multiple times. Optical light microscopy and scanning electron microscopy showed the presence of shear bands in rolled PET. Wide-angle X-ray scattering (WAXS) analysis of the cold-rolled samples reveals anisotropy in the amorphous halo intensity, indicating orientation of PET chains induced by mechanical deformation. Upon subsequent annealing (rolled PET), small-angle X-ray scattering (SAXS) curves display a broad peak centered around 10&#xa0;nm, attributed to the interference maximum of newly formed crystalline PET lamellae (9% degree of crystallinity). These modified PET materials exhibit a pronounced shape-memory effect even under applied loads (~ 250 its own weight) and can act as artificial lifting “arm” and thermal fastening. Furthermore, their mechanical responsiveness within relatively low yet fire-risk temperatures suggests potential application in fire detection systems as thermal sensors.</p> Graphical Abstract <p></p>

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Shape memory behavior of poly(ethylene terephthalate) films/fibers modified by cold longitudinal rolling

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Alena Yarysheva,
  • Yonghao Liu,
  • Alexey Piryazev,
  • Sergey Stepanov,
  • Dmitry Ivanov

摘要

Shape-memory materials (actuators) with rapid thermally activated responses have been developed using amorphous glassy poly(ethylene terephthalate) (PET) films and fibers modified via cold longitudinal rolling. Heating to the PET glass-transition temperature (Tg = 83°C) was accompanied by 100% full shape recovery. This rolling – recovery process can be repeated multiple times. Optical light microscopy and scanning electron microscopy showed the presence of shear bands in rolled PET. Wide-angle X-ray scattering (WAXS) analysis of the cold-rolled samples reveals anisotropy in the amorphous halo intensity, indicating orientation of PET chains induced by mechanical deformation. Upon subsequent annealing (rolled PET), small-angle X-ray scattering (SAXS) curves display a broad peak centered around 10 nm, attributed to the interference maximum of newly formed crystalline PET lamellae (9% degree of crystallinity). These modified PET materials exhibit a pronounced shape-memory effect even under applied loads (~ 250 its own weight) and can act as artificial lifting “arm” and thermal fastening. Furthermore, their mechanical responsiveness within relatively low yet fire-risk temperatures suggests potential application in fire detection systems as thermal sensors.

Graphical Abstract