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Restoration Temperature Control through Glass Transition Temperature Modulation of Shape Memory Polymer for Thermally

Han Jun Park1, Minsu Kim1, Jihoon Lee1

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Shape memory polymers (SMPs) can be programmed to change shape and restore their original form. This study demonstrates controlling the shape recovery temperature by adjusting the glass transition temperature (Tg) of UV-cured SMPs.

Keywords:
dry adhesiveglass transition temperaturepick‐and‐place systemshape memory polymerswitchable adhesive

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Smart Materials

Background:

  • Shape memory polymers (SMPs) exhibit shape recovery triggered by external stimuli, often near their glass transition temperature (Tg).
  • Controlling the Tg is key to tailoring the shape restoration temperature for specific applications.

Purpose of the Study:

  • To investigate the controllability of shape restoration temperature in SMPs by adjusting their Tg.
  • To develop a thermal-activated SMP dry adhesive with programmable Tg and switchable adhesion.

Main Methods:

  • Utilizing Norland Optical Adhesive 63, cured via UV irradiation.
  • Varying ambient temperature during UV exposure (20–120 °C) to modify the polymer's Tg.
  • Developing and testing a thermal-activated SMP dry adhesive.

Main Results:

  • Achieved Tg variations from 35.84 to 50.50 °C, correlating with changes in shape restoration temperature.
  • Demonstrated strong adhesion of the SMP dry adhesive to various rough surfaces.
  • Confirmed switchable adhesion and easy detachment via shape recovery.
  • Showcased suitability for continuous roll-to-roll fabrication.

Conclusions:

  • The Tg of UV-cured SMPs can be effectively tuned to control shape restoration temperature.
  • A programmable SMP dry adhesive with switchable adhesion and robust performance on rough surfaces was successfully developed.
  • The fabrication process is scalable for industrial applications using roll-to-roll methods.