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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 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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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

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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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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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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
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Macrocycle-Based Solid-State Supramolecular Polymers.

Bin Hua1,2, Li Shao1, Ming Li1

  • 1State Key Laboratory of Chemical Engineering, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310027, China.

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Summary
This summary is machine-generated.

This study reviews macrocycle-based solid-state supramolecular polymers (MSSPs), focusing on controlling noncovalent interactions for novel material properties. Research highlights include metal-ligand, host-guest, pi-stacking, and halogen bonding applications in MSSPs.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Supramolecular polymers, formed via noncovalent interactions, offer versatile platforms for advanced materials.
  • Macrocyclic hosts are crucial in developing supramolecular polymers, enabling self-assembly into architectures like pseudopolyrotaxanes and polyrotaxanes.
  • While solution- and gel-state supramolecular polymers are well-studied, solid-state macrocycle-based supramolecular polymers (MSSPs) present unique challenges and opportunities.

Purpose of the Study:

  • To summarize research progress on macrocycle-based solid-state supramolecular polymers (MSSPs).
  • To classify MSSPs based on the noncovalent interactions driving their construction.
  • To highlight the role of macrocyclic hosts in dictating MSSP structure and function.

Main Methods:

  • Classification of MSSPs based on driving noncovalent interactions: metal-ligand interactions, host-guest interactions, π···π stacking, and halogen bonding.
  • Analysis of how these interactions influence the structure, properties, and functions of MSSPs.
  • Review of X-ray crystallography data for direct visualization of molecular arrangements in MSSPs.

Main Results:

  • MSSPs enable the creation of new materials with novel properties, such as mechano-responsiveness.
  • Metal-ligand interactions can introduce metal clusters into MSSPs, yielding solid-state luminescence or proton conduction.
  • Host-guest interactions, π···π stacking, and halogen bonding offer diverse strategies for designing MSSPs with tailored properties.

Conclusions:

  • Controlling noncovalent interactions is key to constructing functional MSSPs.
  • MSSPs offer a platform for developing advanced solid-state materials with tunable properties.
  • Further research into MSSPs promises new discoveries in supramolecular functional systems and architectures.