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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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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 introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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A Pseudo-Block Copolymerization Access to Cyclic Alternating Copolymers through Segment-Selective

Hongxuan Zhu1, Fengzhuang Liu1, Hongxin Zhang1

  • 1Faculty of Materials Science and Engineering, Qinghai University, Qinghai 810016, People's Republic of China.

ACS Macro Letters
|January 21, 2025
PubMed
Summary
This summary is machine-generated.

Synthesizing cyclic polymers is challenging. This study uses macromolecular transesterification during copolymerization to create cyclic alternating copolymers with controlled sizes and low dispersity.

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Area of Science:

  • Polymer Chemistry
  • Macromolecular Science
  • Organic Synthesis

Background:

  • Efficient synthesis of cyclic polymers is a significant challenge in polymer science.
  • Cyclic polymers offer unique properties compared to their linear counterparts.
  • Developing controlled methods for cyclic polymer synthesis is crucial for advanced material applications.

Purpose of the Study:

  • To develop a novel method for the efficient synthesis of cyclic alternating copolymers.
  • To investigate the use of macromolecular transesterification in creating macrocyclic structures.
  • To demonstrate the versatility of the synthesized cyclic polymers for further functionalization.

Main Methods:

  • Organobase-catalyzed ring-opening alternating copolymerization of 3,4-dihydrocoumarin and epoxide using poly(ethylene oxide) as a macroinitiator.
  • Selective intramolecular transesterification (backbiting) on newly formed polyester segments.
  • Isolation of cyclic alternating copolymers via precipitation based on solubility differences.

Main Results:

  • Successfully synthesized cyclic alternating copolymers with low dispersity (<1.2) and controlled molar mass (~3 kg mol⁻¹).
  • Demonstrated thermodynamic control over the ring size, independent of monomer-to-initiator ratio.
  • Confirmed the macrocyclic structure using mass spectroscopy and microscopic visualization.
  • Utilized the cyclic copolymers to prepare cyclic-brush terpolymers via thiol-ene modification and subsequent graft polymerization.

Conclusions:

  • Macromolecular transesterification during pseudoblock copolymerization is an effective strategy for cyclic polymer synthesis.
  • The developed method provides access to well-defined cyclic alternating copolymers.
  • The synthesized cyclic polymers serve as versatile platforms for creating complex polymer architectures like cyclic-brush terpolymers.