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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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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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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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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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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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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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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Polymerization and Structure of Opposing Polymer Brushes Studied by Computer Simulations.

Krzysztof Halagan1, Michal Banaszak2,3, Jaroslaw Jung1

  • 1Department of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Żeromskiego 116, 90924 Lodz, Poland.

Polymers
|December 28, 2021
PubMed
Summary

This study models polymer brush formation, revealing high grafting densities compress chains with minimal interpenetration. Longer chains in polydisperse samples exhibit distinct stretched stem and coiled crown structures.

Keywords:
Monte Carlo methoddynamic lattice liquid modelpolymer brushespolymerization

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Area of Science:

  • Polymer Science
  • Materials Science
  • Computational Chemistry

Background:

  • Polymer brushes are crucial in surface modification and nanotechnology.
  • Understanding their formation and structure is key to controlling material properties.

Purpose of the Study:

  • To model and investigate the polymerization process of dual polymer brushes.
  • To analyze the structural characteristics of synthesized macromolecular systems.

Main Methods:

  • Designed a coarse-grained model of polymer chains on a face-centered cubic lattice.
  • Employed Monte Carlo simulations using the dynamic lattice liquid model on a parallel computing system (ARUZ).

Main Results:

  • Polymerization parameters critically influence brush structure.
  • High grafting densities lead to chain compression with limited interpenetration between opposing surfaces.
  • Polydisperse samples show longer chains with unique stretched stem and coiled crown configurations.

Conclusions:

  • The study provides insights into the self-assembly and structural behavior of polymer brushes.
  • Simulation parameters significantly impact the final polymer brush architecture.
  • The findings are relevant for designing advanced polymeric materials with tailored surface properties.