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Anionic Chain-Growth Polymerization: Overview01:20

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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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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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Functional Isocyanide-Based Polymers.

Zhengxu Cai1, Yue Ren1, Xiaofang Li2

  • 1Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

Accounts of Chemical Research
|November 20, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed new methods for synthesizing functional isocyanide-based polymers (IBPs) using novel catalysts and polymerization techniques. These advanced IBPs exhibit unique optical properties and potential applications in areas like lithography, CO2 utilization, and cancer diagnostics.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Isocyanide-based reactions, like the Passerini reaction, have a long history but faced challenges in synthesizing efficient isocyanide-based polymers (IBPs).
  • Limited progress in developing highly efficient polymerization methods hindered large-scale preparation and application of IBPs.
  • Modern organic chemistry offers opportunities to develop functional IBPs, but challenges remain in synthesizing them from small molecular isocyanides.

Purpose of the Study:

  • To explore novel catalysts and polymerization methodologies for synthesizing a series of functional isocyanide-based polymers (IBPs).
  • To design isocyanide monomers and optimize reaction conditions for creating advanced IBPs with tailored properties.
  • To investigate the characteristic properties and potential applications of these novel functional polymers.

Main Methods:

  • Synthesis of isocyanide monomers, including those with single isocyanide groups and diisocyanide monomers.
  • Development of novel catalysts for isocyanide chemistry to introduce functional pendants into polymer chains.
  • Implementation of multi-component spiropolymerization for constructing heterocyclic, spiro-heterocyclic, and bispiro-heterocyclic polymers.
  • One-pot polymerization of diisocyanides with CO2 under mild conditions.

Main Results:

  • Successfully synthesized functional IBPs by incorporating chromophores, leading to properties like aggregation-induced emission and optical activity.
  • Developed spiropolymers with potential bioactivity and biological compatibility through catalysis-free one-pot reactions.
  • Created UV-sensitive IBPs for lithography, materials for pyroelectric sensors and thermal detectors, and spiro-heterocyclic IBPs with clusterization-triggered emission for cancer cell discrimination.

Conclusions:

  • Advancements in catalyst exploration and polymerization methodology have enabled the synthesis of diverse and functional isocyanide-based polymers (IBPs).
  • These IBPs demonstrate significant potential in various applications, including optical materials, lithography, CO2 utilization, and biomedical diagnostics.
  • Isocyanide polymerization chemistry offers a versatile platform for developing advanced functional macromolecules and materials.