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Updated: Jan 20, 2026

Shape Memory Polymers for Active Cell Culture

Shape Memory Polymers for Active Cell Culture

Published on: July 4, 2011

Shape-memory effects in molecular crystals.

Ejaz Ahmed¹, Durga Prasad Karothu¹, Mark Warren²

¹New York University Abu Dhabi, PO Box 129188, Abu Dhabi, UAE.

Nature Communications

|August 21, 2019

Summary

This summary is machine-generated.

Terephthalic acid crystals exhibit a mechanically induced phase transition upon bending, retaining crystal integrity. These crystals display shape memory effects, recovering their original shape after thermal treatment, similar to metal alloys and polymers.

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Area of Science:

Materials Science
Crystallography
Organic Chemistry

Background:

Molecular crystals typically deform elastically or plastically via delamination.
Mechanically induced phase transitions in intact molecular crystals are not well-documented.

Purpose of the Study:

To investigate the mechanical behavior of terephthalic acid crystals under bending.
To explore the possibility of mechanically induced phase transitions and subsequent shape recovery in molecular crystals.

Main Methods:

Bending experiments on terephthalic acid crystals.
Analysis of crystal structure and phase changes using X-ray diffraction (XRD) and microscopy.
Thermal cycling to induce phase transitions and observe shape recovery.

Main Results:

Terephthalic acid crystals undergo a phase transition upon plastic bending without delamination, maintaining structural integrity.
The plastically bent crystals exhibit bimorph behavior.
Thermal treatment above the phase transition temperature restores the crystal's original phase and shape.
Reverse thermal treatment allows for repeatable shape manipulation, demonstrating shape memory effects.

Conclusions:

Mechanically induced phase transitions in intact molecular crystals are achievable.
Terephthalic acid crystals display significant shape memory properties, analogous to metal alloys and polymers.
Intermolecular interactions in organic solids can be leveraged for adaptive mechanical properties, bridging the gap between mesophases and inorganic materials.