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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Combinatorial Synthesis of and High-throughput Protein Release from Polymer Film and Nanoparticle Libraries
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Synergistic Covalently and Mechanically Interlocked Polymer.

Yi Ding1, Yuanhao Wang1, Changyao Liu1

  • 1State Key Laboratory of Synergistic Chem-Bio Synthesis, Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.

Angewandte Chemie (International Ed. in English)
|July 21, 2025
PubMed
Summary

This study introduces a new synergistic covalently and mechanically interlocked polymer (CMIP) by combining covalent polymers and mechanically interlocked polymers. CMIP shows superior stability and recovery, enabling advanced material development.

Keywords:
Dynamic materialsHost−guest chemistryMechanical adaptivityMechanically interlocked polymersSynergistic effect

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Area of Science:

  • Polymer Science
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Integrating diverse polymers offers a route to high-performance materials by leveraging complementary properties.
  • Mechanically interlocked polymers (MIPs) possess unique advantages due to their spatial entanglement, with potential for property expansion through integration with other architectures.

Purpose of the Study:

  • To develop a novel synergistic covalently and mechanically interlocked polymer (CMIP) by integrating covalent polymers (CPs) and MIPs.
  • To investigate the enhanced thermomechanical stability, performance recovery, and energy dissipation mechanisms of the developed CMIP.

Main Methods:

  • Sequential orthogonal polymerizations were employed to achieve coherent integration of CPs and MIPs.
  • Comparative analysis of CMIP and a non-interlocked control sample under mechanical stress and strain recovery tests.
  • Evaluation of damping capacity and material toughness to assess energy dissipation.

Main Results:

  • The novel CMIP exhibited significantly enhanced thermomechanical stability and performance recovery (93.4% at 100% strain) compared to the control (59.7%).
  • The synergistic interplay between the covalent framework and interlocked structure preserves network integrity and facilitates rapid host-guest reformation.
  • CMIP maintained comparable damping capacity (91% vs. 87%) and material toughness (14.8 vs. 15.1 MJ m⁻³) due to efficient energy dissipation via host-guest dynamics.

Conclusions:

  • The developed CMIP strategy successfully integrates covalent and mechanical interlocking for advanced material properties.
  • This approach offers a promising pathway for creating diverse synergistic materials with enhanced stability, recovery, and energy dissipation.
  • The findings highlight the potential of combining different polymer architectures for next-generation high-performance materials.