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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 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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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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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.
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High-fidelity topochemical polymerization in single crystals, polycrystals, and solution aggregates.

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Topochemical polymerization (TCP) now achieves single-crystal-to-single-crystal transformations in liquid media. This breakthrough enables the synthesis of highly crystalline polymer nanofibers with precise structural integrity.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Crystallography

Background:

  • Topochemical polymerization (TCP) is key for single crystalline polymer synthesis.
  • Traditional TCP is limited to solid-state transformations, facing challenges in single-crystal-to-single-crystal (SCSC) transitions due to lattice mismatches.
  • Performing TCP in liquid media while maintaining solid-state fidelity remains an open challenge.

Purpose of the Study:

  • To investigate the SCSC transformation mechanism of chiral azaquinodimethane (AQM) monomers during TCP.
  • To explore the potential of performing TCP in a liquid medium.
  • To understand the influence of side-chain structure on polymerization kinetics.

Main Methods:

  • In situ X-ray crystallographic analysis to monitor SCSC transformations.
  • In situ investigations of powders and thin films.
  • Antisolvent-reinforced aggregation method for liquid-phase TCP.

Main Results:

  • Detailed elucidation of SCSC transformation during chiral AQM monomer TCP, revealing a rare metastable crystalline phase.
  • Identification of side-chain dependent polymerization kinetics in solid-state reactions.
  • Successful implementation of liquid-medium TCP for AQM monomers, producing highly crystalline polymer nanofibers comparable to solid-state products.

Conclusions:

  • TCP demonstrates high structural precision in both solid and liquid states.
  • The study provides critical insights for synthesizing processable nanostructured polymers with controlled structural integrity.
  • This work expands the scope of TCP for creating advanced polymer materials.