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Related Concept Videos

Polymers02:34

Polymers

32.5K
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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polymer Classification: Stereospecificity01:26

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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A dynamic duo: pairing click chemistry and postpolymerization modification to design complex surfaces.

Rachelle M Arnold1, Derek L Patton, Vladimir V Popik

  • 1Department of Chemistry, College of Engineering, and the Center for Nanoscale Science and Engineering, University of Georgia , Athens, Georgia 30602, United States.

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Summary

Postpolymerization modification and click chemistry enable the creation of complex polymer thin films with multiple functionalities. This approach overcomes limitations in synthesizing polymers with incompatible groups, leading to advanced materials for technologies like biosensors.

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Area of Science:

  • Materials Science and Engineering
  • Polymer Chemistry
  • Surface Science

Background:

  • Advances in biosensors, biomedical implants, and organic light-emitting diodes (OLEDs) require sophisticated control over spatially complex interfaces.
  • Polymer-based thin films are crucial for these applications, but direct synthesis of polymers with incompatible functional groups is challenging.
  • Existing methods like physisorption yield unstable films, while covalent immobilization offers greater robustness.

Purpose of the Study:

  • To explore the use of postpolymerization modification (PPM) combined with click chemistry for creating complex polymer thin films.
  • To demonstrate the ability to generate multicomponent surfaces with precisely patterned chemical functionalities.
  • To overcome limitations in synthesizing polymers with incompatible functional groups for advanced technological applications.

Main Methods:

  • Utilizing covalent immobilization techniques such as 'grafting to' and 'grafting from' to create robust polymer thin films.
  • Employing postpolymerization modification (PPM) on grafted polymer films to introduce multiple chemical functionalities.
  • Leveraging rapid, high-yielding, and orthogonal 'click-like' reactions for efficient PPM, including thiol-based additions, cycloadditions, and carbonyl chemistry.

Main Results:

  • Successfully generated complex polymer coatings on planar surfaces by patterning two or more discrete chemical functionalities using PPM.
  • Demonstrated sequential functionalization using iterative click-type reactions.
  • Showcased the use of multiple orthogonal click-like reactions for one-pot surface patterning and self-sorting functionalities.

Conclusions:

  • Postpolymerization modification in conjunction with click chemistry provides a versatile strategy for creating advanced, multicomponent polymer surfaces.
  • This approach enables the precise patterning of functionalities, leading to otherwise unattainable surface architectures.
  • The developed methods offer significant potential for fabricating materials essential for next-generation technologies.