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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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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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Cohesion01:07

Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Chemical Structural Coherence Principle on Polymers for Better Adhesion.

Alena L Krapivko1, Yegor D Ryabkov1, Fedor V Drozdov2

  • 1M. V. Lomonosov Institute of Fine Chemical Technologies, MIREA-Russian Technological University, Vernadskogo Prospect, 86, 119571 Moscow, Russia.

Polymers
|July 27, 2022
PubMed
Summary

Researchers developed a novel perfluoroalkyltriethoxysilane to improve adhesion with polyhexafluoropropylene. Surface nanostructuring via anodized aluminum created a stable composite material for harsh environments.

Keywords:
adhesionanodized aluminumfluorinated ORMOSILfluoropolymerssurface tuning

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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Engineering

Background:

  • Composite materials offer versatile applications across numerous fields.
  • Polyhexafluoropropylene is known for its inertness and poor adhesion properties, limiting its use in composites.
  • Developing effective surface modifiers is crucial for enhancing the performance of challenging polymers.

Purpose of the Study:

  • To synthesize a novel perfluoroalkyltriethoxysilane (PFAS) as a surface modifier.
  • To investigate the adhesion mechanism between PFAS and polyhexafluoropropylene (PHFP).
  • To enhance the stability and applicability of PHFP-based composites through surface nanostructuring.

Main Methods:

  • Synthesis of a novel perfluoroalkyltriethoxysilane.
  • Fourier-transform infrared (FT-IR) spectroscopy to study surface modification of glass microspheres.
  • Aluminum foil anodizing to create a nanostructured surface.
  • Scanning electron microscopy (SEM) to analyze the anodized aluminum surface.

Main Results:

  • The synthesized perfluoroalkyltriethoxysilane demonstrated chemical structural coherence with polyhexafluoropropylene, enabling partial adhesion.
  • Surface nanostructuring of aluminum via anodizing significantly increased the specific surface area.
  • The final composite, comprising anodized aluminum, the PFAS modifier, and a polyhexafluoropropylene layer, exhibited excellent stability without detachment.

Conclusions:

  • The novel perfluoroalkyltriethoxysilane acts as an effective adhesion promoter for polyhexafluoropropylene.
  • Surface nanostructuring is a viable strategy to improve the interfacial adhesion and stability of polymer composites.
  • The developed composite material shows significant promise for applications in demanding environments.