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Related Concept Videos

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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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Chirality02:25

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Polymer Classification: Crystallinity01:21

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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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Chiral Expression and Morphology Control in Polymer Dispersion Systems.

Xiaoxiao Cheng1, Tengfei Miao1, Yafei Ma1

  • 1Chiral Expression and Morphology Control in Polymer Dispersion Systems, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials, Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.

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Summary

Chiral polymer self-assembly in dispersions is crucial for chiral chemistry. This review compares post-polymerization self-assembly and polymerization-induced self-assembly (PISA) for controlling chiral nanostructures and advanced materials.

Keywords:
chiralitypolymer dispersionspolymersself-assemblysupramolecular chemistry

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Chiral self-assembly of polymers in dispersions is vital for chiral chemistry and creating nanostructures.
  • The method of self-assembly significantly impacts chiral expression and nanostructure morphology.
  • Advanced functional chiroptical materials rely on unique chiral expression and morphological transitions.

Purpose of the Study:

  • To review recent advances in chiral expression and morphology control within polymer dispersion systems.
  • To compare traditional post-polymerization self-assembly with in-situ polymerization-induced self-assembly (PISA) strategies.
  • To provide insights for predicting and advancing chirality control in polymers.

Main Methods:

  • Review of literature on polymer self-assembly in dispersions.
  • Comparative analysis of post-polymerization self-assembly and PISA.
  • Discussion of chiral expression and morphology control mechanisms.

Main Results:

  • Both post-polymerization self-assembly and PISA can yield polymer nanoassemblies.
  • Self-assembly manner critically influences chiral expression and nanostructure properties.
  • PISA offers distinct advantages for in-situ morphology control and chiral expression.

Conclusions:

  • Understanding self-assembly is key to controlling chiral expression in polymer nanostructures.
  • PISA presents a powerful strategy for advanced control over chiral polymer assemblies.
  • This review advances the field of chiral polymer materials by comparing existing and emerging self-assembly techniques.