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Characteristics and Nomenclature of Copolymers01:24

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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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Hierarchically Responsive Alternating Nano-Copolymers with Tailored Interparticle Bonds.

Huibin He1, Xiaoxue Shen1, Chongyang Yao1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Metasurfaces for Light Manipulation, Department of Macromolecular Science, Fudan University, 200438, Shanghai, P. R. China.

Angewandte Chemie (International Ed. in English)
|February 25, 2024
PubMed
Summary

Researchers created pH-responsive nanostructures from inorganic nanoparticles (NPs). These alternating nano-copolymers (ANCPs) offer tunable properties and potential applications in biosensing and electronics.

Keywords:
Electrostatic InteractionsHierarchically ResponsiveNano-CopolymersNanoparticlesSelf-Assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Self-assembly of inorganic nanoparticles (NPs) is crucial for creating advanced materials.
  • Controlling ordered assembly and properties in binary NP systems presents significant challenges.

Purpose of the Study:

  • To develop hierarchically pH-responsive alternating copolymer-like nanostructures from binary inorganic NPs.
  • To engineer interparticle electrostatic interactions for programmable NP assembly.

Main Methods:

  • Utilizing polymer-grafted NPs with opposite charges as nanoscale monomers (nanomers).
  • Inducing copolymerization into alternating nano-copolymers (ANCPs) via electrostatic interactions.
  • Investigating pH-dependent changes in interparticle bond length and nanostructure stability.

Main Results:

  • Achieved hierarchically pH-responsive nanostructures (ANCPs) in an aqueous medium.
  • Demonstrated reversible control over ANCP 'bond' length (inter-nanomer distance) between pH ~7-10, tuning surface plasmon resonance.
  • Observed disassembly of ANCPs into dimers/trimers at pH ≥11 and reassembly upon return to pH 7.

Conclusions:

  • Successfully engineered binary inorganic NPs into pH-responsive ANCPs.
  • The developed nanostructures exhibit tunable properties and reversible assembly/disassembly.
  • Potential applications include biosensing, optical waveguides, and electronic devices.