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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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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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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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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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Propylene-Ethylene Copolymer Covalent Adaptable Networks Synthesized by Resonance-Stabilized, Radical-Based Reactive

Yen-Wen Huang1, Mathew J Suazo1, Stephanie M Barbon2

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.

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Summary

This study introduces a one-step method to create recyclable covalent adaptable networks (CANs) from propylene-ethylene copolymer (PEC) thermoplastics, significantly improving creep resistance in both melt and semicrystalline states while maintaining reprocessability.

Keywords:
covalent adaptable networkspolyolefinpolypropyleneradical reactionsresonance stabilizationsustainable chemistry

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science
  • Chemical Engineering

Background:

  • Low-crystallinity propylene-ethylene copolymer (PEC) thermoplastics suffer from creep, limiting their high-temperature applications.
  • Reprocessability is crucial for sustainable polymer utilization, but often compromised by enhanced mechanical properties.

Purpose of the Study:

  • To develop a one-step reactive processing strategy for creating creep-resistant and reprocessable PEC.
  • To introduce dynamic covalent cross-links into PEC to form covalent adaptable networks (CANs).

Main Methods:

  • Utilized a phenylacrylate-based cross-linker (BPST) and vinyl aromatic additives during radical-based reactive processing.
  • Investigated the suppression of β-scission and promotion of resonance-stabilized macroradical intermediates.
  • Assessed creep resistance in melt and semicrystalline states and reprocessability via compression molding and extrusion.

Main Results:

  • The use of BPST and vinyl aromatic additives enabled percolated PEC CAN formation with suppressed β-scission.
  • The resulting PEC CANs demonstrated superior elevated-temperature creep resistance (>99% suppression at 160°C, >98% at 100°C).
  • The optimized PEC CAN exhibited full recovery of cross-link density and tensile properties after reprocessing.

Conclusions:

  • A novel one-step method effectively produces recyclable PEC CANs with exceptional creep resistance.
  • This approach addresses key limitations of low-crystallinity polyolefins, enabling broader applications.
  • The developed materials offer a sustainable solution for high-performance, reprocessable thermoplastics.