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

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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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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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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.
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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: Acyclic Diene Metathesis (ADMET)00:53

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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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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Glycol-functionalized ionic liquids for high-temperature enzymatic ring-opening polymerization.

Hua Zhao1, Lennox O Afriyie1, Nathaniel E Larm2

  • 1Department of Chemistry and Biochemistry, University of Northern Colorado Greeley CO 80639 USA hua.zhao@unco.edu huazhao98@gmail.com.

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This summary is machine-generated.

New ionic liquids enable enzymatic polyester synthesis at high temperatures. These glycol-grafted solvents support efficient ring-opening polymerization (ROP) for producing high molecular mass polyesters like polylactide.

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Area of Science:

  • Polymer Chemistry
  • Green Chemistry
  • Biocatalysis

Background:

  • Enzymatic ring-opening polymerization (ROP) offers a sustainable route to polyesters.
  • High temperatures (60-130 °C) are often required, but suitable enzyme-compatible solvents are lacking.
  • Developing task-specific solvents is crucial for advancing biocatalytic polyester synthesis.

Purpose of the Study:

  • To synthesize and characterize novel glycol-grafted ionic liquids (ILs).
  • To evaluate the thermal stability and viscosity of these ILs for high-temperature applications.
  • To assess the performance of these ILs as solvents in enzymatic ROP for polyester production.

Main Methods:

  • Synthesis of short-chained glycol-grafted ionic liquids with various cationic headgroups (phosphonium, imidazolium, etc.).
  • Characterization of ILs' dynamic viscosity, thermal stability (decomposition temperature), and long-term stability at 130 °C.
  • Enzymatic ROP of lactide and ε-caprolactone using Novozym 435 in the developed ILs and solventless conditions.

Main Results:

  • Several glycol-grafted ILs showed low viscosity (33-123 mPa s) and high thermal stability (318-403 °C).
  • Excellent long-term thermal stability at 130 °C was observed for specific ILs.
  • Enzymatic ROP in these ILs yielded higher molecular mass polyesters (∼20 kDa) compared to solventless methods (12-14 kDa).

Conclusions:

  • Glycol-grafted ionic liquids are effective, enzyme-compatible solvents for high-temperature enzymatic ROP.
  • These ILs facilitate the production of high molecular mass polyesters with good yields.
  • The developed ILs represent a promising advancement for green and efficient polyester synthesis.