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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 radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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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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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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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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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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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Star PolyMOCs with Diverse Structures, Dynamics, and Functions by Three-Component Assembly.

Yufeng Wang1,2, Yuwei Gu1, Eric G Keeler1,3

  • 1Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, USA.

Angewandte Chemie (International Ed. in English)
|December 6, 2016
PubMed
Summary
This summary is machine-generated.

We developed star polymer metal-organic cage (polyMOC) materials with tunable properties using a three-component assembly. This strategy precisely controls network structure, mechanical properties, and dynamics for advanced material applications.

Keywords:
gelsmetal-organic cagesmetallosupramolecular assemblypolyMOCspolymer networks

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Metal-organic cages (MOCs) are discrete molecular entities with tunable properties.
  • Star polymers offer unique architectures for network formation.
  • Precise control over material properties is crucial for advanced applications.

Purpose of the Study:

  • To develop a novel star polymer metal-organic cage (polyMOC) material.
  • To demonstrate a facile three-component assembly strategy for polyMOCs.
  • To investigate the tunability of polyMOC structures, mechanical properties, and dynamics.

Main Methods:

  • Synthesis of tetra-arm star polymers functionalized with ligands.
  • Metal-ligand coordination using palladium ions and small molecule ligands.
  • Thermal annealing to form the polyMOC network.
  • Varying the ratio of small molecule ligands to polymer-bound ligands.

Main Results:

  • Achieved precise control over polyMOC network structure and connectivity.
  • Demonstrated tunable mechanical moduli and relaxation dynamics.
  • Successfully tailored material properties through a simple three-component assembly.

Conclusions:

  • The developed star polyMOCs offer a versatile platform for designing materials with tailored properties.
  • The three-component assembly strategy provides a powerful tool for controlling network architecture and material performance.
  • This work opens new avenues for creating advanced functional materials based on polyMOCs.