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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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.
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Preparation of Amides01:29

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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
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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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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Mixed Amide Paracyclophane Assemblies Emulating Supramolecular Copolymers.

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New [2.2]paracyclophane-tetracarboxamides ([2.2]pCpMTAs) mimic supramolecular copolymers. Programmable hydrogen bonding controls self-assembly and structural outcomes in amide-based polymers.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Materials Science
  • Polymer Chemistry

Background:

  • [2.2]Paracyclophanes ([2.2]pCps) are valuable for studying charge-transfer and in photoredox chemistry.
  • The first [2.2]paracyclophane-tetracarboxamide ([2.2]pCpTA) was synthesized in 2016.
  • Supramolecular polymers offer tunable properties through controlled self-assembly.

Purpose of the Study:

  • To explore mixed-amide [n.n]paracyclophane-tetracarboxamides ([n.n]pCpMTAs) for emulating supramolecular copolymers.
  • To investigate how stereoelectronic effects influence self-assembly and polymer formation.
  • To demonstrate structural control in amide-based supramolecular polymers via engineered H-bonding.

Main Methods:

  • Synthesis and characterization of mixed-deck pseudo-ortho and pseudo-meta [2.2]pCpMTA monomers.
  • Variable-concentration and variable-temperature spectroscopy.
  • X-ray crystallography and density functional theory (DFT) calculations.

Main Results:

  • Designed [2.2]pCpMTA monomers exhibit programmable transannular hydrogen bonding.
  • H-bonding dictates small-molecule conformation and amide sequencing in assemblies.
  • Spectroscopic, crystallographic, and DFT data correlate H-bonding, assembly, and dipolar effects with structural control.

Conclusions:

  • Mixed-amide [n.n]pCpMTAs effectively emulate alternating supramolecular copolymers.
  • Stereoelectronic engineering via H-bonding provides precise control over supramolecular polymerization.
  • These findings offer insights applicable to designing diverse supramolecular architectures beyond cyclophanes.