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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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Development of Controllable Hetero-Pauson-Khand Polymerization to Functional Stimuli-Responsive Poly(γ-lactam)s.

Wutong Du1,2, Xinyue Liu1, Feiyi Sun1

  • 1Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 997077, P. R. China.

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Summary

Researchers developed an efficient polymerization method for creating novel poly(γ-lactam)s. These advanced polymers exhibit luminescence and respond to light and acid, with potential for new material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Lactam-containing polymers are vital in biological systems and material science.
  • Controlled synthesis and functionalization of lactam polymers are essential for biomimetics and advanced materials.

Purpose of the Study:

  • To develop an efficient heterogeneous Pauson-Khand polymerization (h-PKP) method for synthesizing main-chain poly(γ-lactam)s.
  • To explore the properties and applications of these novel polymers, including their luminescence and responsiveness.

Main Methods:

  • Utilized an efficient heterogeneous Pauson-Khand polymerization (h-PKP) method.
  • Employed readily available internal alkynes and imines for synthesis.
  • Controlled molecular weights by adjusting phenyl formate and nickel ratios.

Main Results:

  • Achieved controlled synthesis of main-chain poly(γ-lactam)s with α, β-unsaturated γ-lactam functionalities.
  • Polymers exhibited high solid-state luminescence and dual responsiveness to light and acid.
  • Demonstrated strong reactive oxygen species (ROS) generation capability and unique aggregation-induced excited-state proton transfer.

Conclusions:

  • The efficient one-pot h-PKP method offers a novel strategy for constructing polymers with γ-lactam structures.
  • Simple post-modification methods provide a versatile approach for functionalizing poly(γ-lactam)s.
  • These polymers hold significant potential for biomimetics and the development of new functional materials.