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Related Concept Videos

Long-term Potentiation01:35

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Long-term Potentiation01:25

Long-term Potentiation

Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
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Plastic Behavior01:21

Plastic Behavior

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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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Chunking and Rehearsal in Sensory Memory01:22

Chunking and Rehearsal in Sensory Memory

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Related Experiment Video

Updated: Jul 16, 2026

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

Published on: October 23, 2015

Optimized Polyurethane/CNTs Composite for Stress-Free Two-Way Shape Memory via Training Enhancement.

Yutong Guo1, Kangkang Shi2, Yujie Chen1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Polymers
|July 15, 2026
PubMed
Summary

This study integrates carbon nanotubes (CNTs) into polyurethane to create advanced shape memory polymer composites. These materials show improved thermal conductivity, mechanical strength, and tunable shape memory behaviors for diverse applications.

Keywords:
polyurethaneprogrammabletwo-way shape memory polymer

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Published on: October 23, 2015

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Thermally responsive shape memory polymers (SMPs) are intelligent materials with broad applications.
  • Poor thermal conductivity limits the practical utility of conventional SMPs.
  • Carbon nanotubes (CNTs) offer excellent thermal conductivity and photothermal properties.

Purpose of the Study:

  • To enhance the thermal conductivity and shape memory performance of polyurethane.
  • To investigate the integration of CNTs into a polyurethane matrix.
  • To explore novel functionalities like shape reprogramming and remote manipulation.

Main Methods:

  • Stepwise polymerization using hydroxyl terminated polycaprolactone (PCL-diOH), poly(ethylene glycol) (PEG), and hexamethylene diisocyanate (HDI).
  • Integration of carbon nanotubes (CNTs) into the polyurethane matrix.
  • Characterization of mechanical strength, thermal conductivity, and shape memory behavior.

Main Results:

  • The resulting CNT-polyurethane composite demonstrated enhanced mechanical strength and thermal conductivity.
  • The material exhibited superior shape memory performance, including a training enhancement phenomenon.
  • Stress-free two-way shape memory behavior and vitrimer properties at 110 °C were achieved.
  • Remote manipulation under light stimulation and multi-stimuli responsive shape memory were demonstrated.

Conclusions:

  • CNTs significantly improve the thermal and mechanical properties of polyurethane shape memory composites.
  • The developed composite offers advanced functionalities including shape reprogramming and multi-stimuli responsiveness.
  • This material holds great potential for real-world applications requiring intelligent shape memory behavior.