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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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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Polymers02:34

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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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Shape Memory Polymers Based on Supramolecular Interactions.

Zhi-Chao Jiang1, Yao-Yu Xiao1, Yang Kang2

  • 1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University , Chengdu 610065, China.

ACS Applied Materials & Interfaces
|May 30, 2017
PubMed
Summary
This summary is machine-generated.

This review explores supramolecular interactions in shape memory polymers (SMPs). These dynamic interactions enhance SMP properties, opening new applications in materials science.

Keywords:
host−guest interactionhydrogen bondinghydrophobic interactionionic interactionmetal−ligand coordinationshape memory polymerssupramolecular interactions

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Shape memory polymers (SMPs) exhibit shape-changing capabilities in response to stimuli.
  • Incorporating supramolecular interactions introduces dynamic and reversible properties to SMPs.

Purpose of the Study:

  • To review recent advancements in supramolecularly-based SMPs.
  • To provide insights into material design and shape memory mechanisms.
  • To evaluate the properties and performance of these novel SMPs.

Main Methods:

  • Literature review of recent research on supramolecular SMPs.
  • Analysis of material design strategies.
  • Evaluation of shape memory mechanisms and performance metrics.

Main Results:

  • Supramolecular interactions significantly enhance SMP functionalities.
  • Novel SMP designs demonstrate improved properties and performance.
  • Diverse applications are emerging due to these advancements.

Conclusions:

  • Supramolecular SMPs represent a promising area of materials science.
  • Further research can unlock broader industrial applications.
  • The dynamic nature of supramolecular bonds is key to advanced shape memory effects.