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Related Concept Videos

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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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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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 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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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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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Hamiltonian replica-exchange method α-REMD for ring spearing elimination in polymers.

Artem Yu Kunitsyn1, Nadezhda A Nekrasova2, Nikolai V Krivoshchapov1

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This study introduces alpha-Replica Exchange Molecular Dynamics (α-REMD), a new method to fix structural defects in polymer models. α-REMD effectively removes ring spearing and relaxes structures for accurate molecular dynamics simulations.

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Area of Science:

  • Polymer Science
  • Computational Chemistry
  • Materials Science

Background:

  • Accurate molecular dynamics (MD) simulations require well-relaxed polymer structures.
  • De-novo polymer models often contain structural defects like close contacts and ring spearing.
  • Existing methods struggle to eliminate ring spearing and achieve complete relaxation.

Purpose of the Study:

  • To develop a robust method for eliminating structural defects in polymer models.
  • To improve the accuracy of polymer property predictions using MD simulations.
  • To address the challenge of ring spearing in ring-containing polymers.

Main Methods:

  • Development of alpha-Replica Exchange MD (α-REMD), a Hamiltonian replica-exchange protocol.
  • Application of α-REMD to five polyethersulfone models with initial structural defects.
  • Validation of defect elimination and structure relaxation through simulation.

Main Results:

  • α-REMD successfully eliminated all ring spearing defects in the tested polyethersulfone models.
  • The protocol achieved general structure relaxation, improving model quality.
  • Demonstrated efficiency of α-REMD in preparing polymer structures for MD simulations.

Conclusions:

  • α-REMD is an effective protocol for defect removal and structure relaxation in polymer modeling.
  • This method enhances the reliability of polymer property predictions via MD simulations.
  • α-REMD offers a significant advancement for simulating complex polymer systems, especially those with rings.