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Related Concept Videos

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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Anionic Chain-Growth Polymerization: Overview01:20

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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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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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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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Updated: Mar 21, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Ring-Opening Polymerization to Access Chemically Recyclable Aromatic Poly(thio)carbonates.

Jia-Rong Yao1, Jian Zhang1, Kun Li1

  • 1National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Advanced Polymer Materials, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P. R. China.

ACS Macro Letters
|March 20, 2026
PubMed
Summary
This summary is machine-generated.

Chemically recyclable aromatic polycarbonates were created using novel cyclic thiocarbonate monomers. These sulfur-containing polymers demonstrate enhanced properties and efficient depolymerization, offering a sustainable alternative for high-performance plastics.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Aromatic polycarbonates are high-performance thermoplastics.
  • Chemical recycling of aromatic polycarbonates remains a significant challenge.
  • Developing sustainable and economical recycling methods is crucial.

Purpose of the Study:

  • To synthesize novel benzo-fused seven-membered cyclic thiocarbonate monomers (M1 and M2).
  • To construct chemically recyclable aromatic poly(thio)carbonates from these monomers.
  • To evaluate the properties and recyclability of the synthesized polymers.

Main Methods:

  • DBU-catalyzed polymerization of M1 and M2 monomers.
  • Characterization of the resulting aromatic poly(thio)carbonates (P(M1) and P(M2)).
  • Assessment of polymer properties including thermal transitions and refractive index.
  • Investigation of depolymerization using tin(II) chloride (SnCl2).

Main Results:

  • Efficient polymerization achieved with low catalyst loading (0.01 mol %).
  • P(M1) exhibited a melting point (Tm) of 131 °C (semicrystalline), P(M2) showed a glass transition temperature (Tg) of 48 °C (amorphous).
  • Enhanced refractive index (nD = 1.64/1.71) compared to commercial polycarbonates.
  • Efficient SnCl2-mediated depolymerization of P(M2) recovered monomer M2 with >95% yield.

Conclusions:

  • Novel sulfur-containing cyclic thiocarbonate monomers enable the synthesis of chemically recyclable aromatic poly(thio)carbonates.
  • Incorporation of sulfur enhances polymer properties like refractive index.
  • The developed polymers offer a promising route for sustainable plastic recycling through efficient depolymerization.