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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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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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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Gold-Catalyzed Post-Polymerization Modification of Commodity Aromatic Polymers.

Eric R King1, Samuel B Hunt1, Levi J Hamernik1

  • 1School of Polymer Science and Engineering, The University of Southern Mississippi, 118 College Drive, Hattiesburg, Mississippi 39406, United States.

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|October 4, 2021
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Gold catalysis enables direct functionalization of aromatic polymers like polystyrene (PS), polysulfone (PSU), and polyethylene terephthalate (PET) by adding methyl acrylate groups. This breakthrough offers a mild and practical method to modify polymer properties.

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Area of Science:

  • Polymer Chemistry
  • Organometallic Catalysis
  • Materials Science

Background:

  • Synthetic aromatic polymers are vital in industry but difficult to functionalize due to unreactive C-H bonds.
  • Existing methods for polymer modification are often harsh or lack selectivity.
  • Developing mild and efficient functionalization techniques is crucial for advanced material design.

Purpose of the Study:

  • To demonstrate a novel method for the direct functionalization of commodity aromatic polymers.
  • To explore the use of homogeneous gold catalysis for polymer modification.
  • To investigate the scope and limitations of gold-catalyzed hydroarylation on various aromatic polymers.

Main Methods:

  • Employed homogeneous gold catalysis for intermolecular hydroarylation reactions.
  • Utilized methyl propiolate as the alkyne source to introduce methyl acrylate functional groups.
  • Investigated the functionalization of polystyrene (PS), polysulfone (PSU), and polyethylene terephthalate (PET).

Main Results:

  • Achieved direct functionalization of phenyl rings in polystyrene with 1,2-substituted methyl acrylate groups.
  • Demonstrated broad scope, successfully functionalizing polysulfone and waste polyethylene terephthalate.
  • Showcased that reactivity is influenced by catalyst environment, counterion, and activation method.

Conclusions:

  • Homogeneous gold catalysis provides a mild, chemoselective, and practical route for aromatic polymer functionalization.
  • This approach opens new avenues for chemically transforming and tailoring the properties of high-volume polymers.
  • The method offers a sustainable pathway for valorizing waste polymers like PET.