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Related Concept Videos

Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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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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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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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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Rationally Designed Eugenol-Based Chain Extender for Self-Healing Polyurethane Elastomers.

Uk-Jae Lee1,2, Se-Ra Shin3, Heewon Noh1,2

  • 1School of Chemical and Biological Engineering, Seoul National University, Gwanak-ro 1, Gwanak-gu, 08826 Seoul, Republic of Korea.

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This study introduces bio-based self-healing polyurethane using eugenol glycol dimer (EGD). The novel material exhibits remarkable self-healing and antioxidant properties, offering a sustainable alternative to petroleum-based polyurethanes.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Sustainable Chemistry

Background:

  • Growing demand for sustainable materials due to petroleum depletion.
  • Need for advanced polymers with self-healing and antioxidant functionalities.
  • Limitations of conventional petroleum-based polyurethanes.

Purpose of the Study:

  • To synthesize and characterize a novel bio-based self-healing polyurethane.
  • To utilize eugenol glycol dimer (EGD) as a key polyol component.
  • To evaluate the self-healing and antioxidant properties of the synthesized polyurethane.

Main Methods:

  • Synthesis of eugenol glycol dimer (EGD) polyol.
  • Incorporation of EGD into polyurethane (PU) synthesis using tetramethylene ether glycol and 4,4'-methylene diphenyl diisocyanate.
  • Characterization of PU properties, including self-healing efficiency and antioxidant activity (DPPH assay).

Main Results:

  • Successfully synthesized and characterized bio-based self-healing PU using EGD.
  • Achieved excellent initial self-healing efficiency (99.84%) and retained high efficiency (84.71%) after three cycles.
  • Demonstrated significant antioxidant properties attributed to the EGD component.
  • Identified transcarbamoylation via pendant hydroxyl groups as the self-healing mechanism.

Conclusions:

  • Eugenol-based EGD is a viable polyol for creating high-performance bio-based polyurethanes.
  • The synthesized EGD-PU exhibits exceptional self-healing and antioxidant capabilities.
  • EGD-PU presents a promising sustainable alternative for applications in self-healable films and coatings.