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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Actively moving polymers.

Marc Behl1, Andreas Lendlein1

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Soft Matter
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Summary
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Stimuli-responsive polymers exhibit active movement. This study explores shape-memory polymers and shape-changing polymers, detailing molecular design and various actuation methods for advanced material applications.

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science
  • Smart Materials

Background:

  • Polymers capable of active movement in response to stimuli like heat or light hold significant scientific and technological importance.
  • Stimuli-responsive effects at the molecular level are translated into macroscopic movements, broadly categorized into shape-memory effects and shape-changing capabilities.

Purpose of the Study:

  • To present fundamental concepts for the molecular design of polymer architectures for shape-memory polymers.
  • To outline tailored programming processes for stimuli-responsive polymers.
  • To review various actuation mechanisms for polymers, including thermal, light, electrical, magnetic, and humidity-based stimuli.

Main Methods:

  • Discussion of molecular design principles for shape-memory polymers.
  • Explanation of programming processes for inducing shape-memory effects.
  • Overview of indirect actuation methods for thermally-induced effects (IR irradiation, electric current, humidity, magnetic fields).
  • Exploration of light-induced shape-memory polymers.
  • Presentation of concepts for shape-changing polymers, including liquid crystal elastomers (LCEs) and photomechanical effects.

Main Results:

  • Detailed concepts for designing polymer architectures to achieve shape-memory effects.
  • Demonstration of thermally-induced shape-memory effects and their extension to other stimuli.
  • Outline of indirect actuation methods for thermal effects.
  • Introduction to light-induced shape-memory polymers.
  • Presentation of two primary concepts for shape-changing polymers: LCE phase orientation and photomechanical effects.

Conclusions:

  • The study provides a comprehensive overview of stimuli-responsive polymers, covering both shape-memory and shape-changing behaviors.
  • It highlights the importance of molecular design and programming processes for achieving desired macroscopic movements.
  • Various actuation strategies, from thermal to light-based, are discussed, paving the way for advanced polymer-based material applications.