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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 Polymerization: Overview01:03

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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Enzyme-Mimic Photoinitiated Flow-Polymerization with High Stereoselectivity under Mild Conditions.

Yuhui Zhang1,2, Shuai Pang1,2, Jiangwei Fu1,3

  • 1Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.

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|April 1, 2025
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Summary

This study introduces a novel enzyme-mimic catalytic material for controlled flow polymerization. The zinc porphyrin metal-organic framework (Zn-PMOF) membrane enables highly stereoselective polymerization of benzyl acrylate under mild conditions.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Catalysis

Background:

  • Enzymatic reactions offer high specificity and stereoselectivity in polymerization.
  • Current enzyme-mimic systems struggle with stereoregularity in flow polymerization under mild conditions.
  • Lack of specific catalyst structures hinders precise chain control for target monomers.

Purpose of the Study:

  • To develop an enzyme-mimic catalytic material for specific monomer polymerization.
  • To achieve high stereoselectivity in photoinitiated flow polymerization under mild conditions.
  • To investigate the role of catalyst structure and nanochannels in controlling polymer stereochemistry.

Main Methods:

  • Utilized zinc porphyrin metal-organic framework (Zn-PMOF) membranes with 1D nanochannels.
  • Employed photoinitiation under visible light at 22 °C for benzyl acrylate polymerization.
  • Conducted control experiments, density functional theory (DFT) simulations, and spectroscopic characterizations.

Main Results:

  • Achieved efficient synthesis of highly heterotactic polymers via enzyme-mimic photoinitiated flow polymerization.
  • Demonstrated that Zn-PMOF membranes, unlike copper porphyrin MOFs, initiate polymerization effectively.
  • Observed enhanced monomer conversion and polymer stereoregularity due to size effects and channel-monomer interactions within Zn-PMOF nanochannels.
  • Reported superior crystallinity, shear stress, and ionic conductivity in enzyme-mimic polymers compared to bulk polymerization products.

Conclusions:

  • Zn-PMOF membranes provide a method for enzyme-mimic polymerization with high stereoselectivity under mild conditions.
  • The specific nanochannel structure of Zn-PMOF is crucial for stereochemical control in flow polymerization.
  • This approach offers a promising route for synthesizing advanced polymers with tailored properties.