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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Molecular Weight of Step-Growth Polymers01:08

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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The extent of the...
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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Modeling sequence-specific polymers using anisotropic coarse-grained sites allows quantitative comparison with

Thomas K Haxton1, Ranjan V Mannige1, Ronald N Zuckermann1

  • 1Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.

Journal of Chemical Theory and Computation
|November 18, 2015
PubMed
Summary
This summary is machine-generated.

A new coarse-grained modeling approach accurately simulates peptoid polymer self-assembly into nanosheets. This method captures multiscale dynamics, bridging atomic fluctuations to large-scale polymer evolution for materials science insights.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Polymer Science

Background:

  • Peptoid polymers, synthetic peptide analogs, self-assemble into bilayer nanosheets.
  • This supramolecular assembly occurs via a nonequilibrium pathway at air-water interfaces.
  • Understanding these large-scale dynamic processes requires multiscale modeling.

Purpose of the Study:

  • To develop and validate a new coarse-grained modeling approach for peptoid polymer assembly.
  • To accurately capture behavior across a wide range of length and time scales.
  • To resolve microscopic structures responsible for experimental scattering data.

Main Methods:

  • A novel coarse-grained modeling approach with fluctuating orientational degrees of freedom.
  • Parametrization of bonded and nonbonded interactions.
  • Generation of all-atom configurations for scattering calculations and all-atom simulation interfacing.
  • Reproduction of experimental X-ray scattering data.

Main Results:

  • The coarse-grained model accurately reproduces experimental X-ray scattering data for nanosheets and adsorbed peptoids.
  • The model successfully resolves microscopic, real-space structures.
  • The approach is computationally efficient and accurate for multiscale simulations.

Conclusions:

  • The developed coarse-grained modeling approach is effective for studying peptoid polymer self-assembly.
  • This method provides a foundation for future multiscale simulations of sequence-specific polymers.
  • Accurate multiscale modeling is crucial for understanding complex dynamic processes in materials science.