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Shape Memory Polymers for Active Cell Culture
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Temperature memory effect in amorphous shape memory polymers.

Kai Yu1, H Jerry Qi

  • 1The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. qih@me.gatech.edu.

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|October 30, 2014
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Summary
This summary is machine-generated.

The temperature memory effect (TME) in shape memory polymers (SMPs) is not always consistent. Recovery temperature (Tc) is influenced by programming and recovery conditions, not just programming temperature (Td).

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • Shape memory polymers (SMPs) exhibit a temperature memory effect (TME), enabling them to recall programming temperatures.
  • Previous studies demonstrated TME by aligning programming temperature (Td) with recovery temperature (Tc), observed via maximum recovery stress or speed.
  • However, the consistent relationship between Td and Tc under diverse conditions remained unverified.

Purpose of the Study:

  • To investigate whether the recovery temperature (Tc) in shape memory polymers consistently equals the programming temperature (Td) across various thermo-temporal conditions.
  • To analyze the influence of programming and recovery parameters on the TME in acrylate-based amorphous SMPs.
  • To elucidate the underlying mechanisms governing the TME and its temperature range.

Main Methods:

  • Examined the free recovery profiles of an acrylate-based amorphous SMP.
  • Analyzed the relationship between programming temperature (Td) and recovery temperature (Tc) under varied conditions.
  • Utilized the concept of reduced time to explain the observed dependencies.

Main Results:

  • The recovery temperature (Tc), defined by maximum recovery speed, is significantly dependent on both programming and recovery conditions.
  • Factors like holding time and heating rate alter the reduced programming and recovery times, decoupling Tc from Td.
  • The effective temperature range for TME is influenced by programming history but not recovery conditions.

Conclusions:

  • The relationship between programming temperature (Td) and recovery temperature (Tc) in SMPs is not fixed and is modulated by various experimental parameters.
  • Reduced time is a critical parameter for understanding and predicting the TME behavior in SMPs.
  • The TME in SMPs is achievable within a specific temperature window, determined by programming history.