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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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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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Olefin Metathesis Polymerization: Overview01:13

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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Preparation of Epoxides03:00

Preparation of Epoxides

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Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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A Polycondensation-depolymerization strategy enables closed-loop recyclable polyoxalates via ring-opening

Yalei Liu1, Zheng Li1, Dongfang Zhao1

  • 1State Key Laboratory of Advanced Optical Polymer and Manufacturing Technology, College of Polymer Science and Engineering, Qingdao University of Science and Technology Qingdao 266042 China zbli@qust.edu.cn.

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We developed a scalable polycondensation-depolymerization method for recyclable polyoxalates. These polymers are chemically recyclable and marine degradable, offering sustainable material solutions.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science

Background:

  • Scalable production of closed-loop recyclable polymers from abundant feedstocks is crucial.
  • Developing efficient synthesis and recycling strategies for novel polymers is a key challenge.

Purpose of the Study:

  • To present a facile "polycondensation-depolymerization" approach for large-scale synthesis of cyclic 1,2-alkylene oxalates.
  • To investigate the influence of alkyl substituents on polyoxalate polymerization and properties.
  • To demonstrate the chemical recyclability and marine degradability of synthesized polyoxalates.

Main Methods:

  • Facile "polycondensation-depolymerization" for cyclic 1,2-alkylene oxalates synthesis.
  • Controlled ring-opening polymerization to yield high-molecular-weight polyoxalates.
  • Systematic investigation of alkyl substituent effects on polymerization kinetics, thermodynamics, and material properties.
  • Chemical recycling of polyoxalates to monomers using sodium glycolate catalyst.

Main Results:

  • Successful large-scale synthesis of cyclic 1,2-alkylene oxalates and high-molecular-weight polyoxalates.
  • Detailed understanding of how alkyl substituents impact polymerization and material characteristics.
  • High-purity monomer recovery and yield achieved through chemical recycling.
  • Demonstrated excellent marine degradability of polyoxalates, tunable via copolymerization.

Conclusions:

  • The "polycondensation-depolymerization" method offers an efficient route to scalable, recyclable polyoxalates.
  • Polyoxalates present a promising class of sustainable polyesters with tunable marine degradability.
  • This work provides a viable strategy for developing environmentally friendly polymeric materials.