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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Microbial Bioremediation of Plastics01:28

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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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Surface modification of polyethylene with multi-end-functional polyethylene additives.

Sarah J Hardman1, Lian R Hutchings, Nigel Clarke

  • 1Department of Chemistry, Science Site, Durham Centre for Soft Matter, Durham, UK.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 24, 2012
PubMed
Summary

Adding multifluorocarbon additives to polyethylene significantly enhances surface hydrophobicity and lipophobicity. These additives concentrate at the surface, creating water contact angles over 112° for improved material properties.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Surface Chemistry

Background:

  • Polyethylene (PE) is a widely used polymer with applications limited by its surface properties.
  • Enhancing PE surface hydrophobicity and lipophobicity is crucial for advanced material applications.
  • Surface modification techniques are essential for tailoring polymer performance.

Purpose of the Study:

  • To prepare and characterize multifluorocarbon end-functional polyethylene additives.
  • To investigate the effect of these additives on the surface properties of polyethylene matrices.
  • To understand the surface enrichment and self-stratification behavior of the additives.

Main Methods:

  • Preparation and characterization of multifluorocarbon end-functional polyethylene additives.
  • Blending additives with polyethylene matrices and preparing spin-cast films.
  • Contact angle measurements to assess surface hydrophobicity and lipophobicity.
  • X-ray photoelectron spectroscopy (XPS) for surface composition analysis.
  • Ion beam analysis and neutron reflectometry for quantifying surface excess and stratification.

Main Results:

  • Addition of <1% fluorocarbon additive increased water contact angles from ~98° to >112°.
  • XPS confirmed up to 80-fold enrichment of additives at the air-polymer interface.
  • Ion beam analysis quantified surface excess based on additive composition, functionality, and molecular weight.
  • Phase separation and self-stratification were observed at the substrate interface in some cases.
  • Surface excess remained largely independent of the film's state (semicrystalline or molten) when melting temperatures were similar.

Conclusions:

  • Multifluorocarbon end-functional additives effectively enhance polyethylene surface hydrophobicity and lipophobicity.
  • Additive enrichment at the surface is a key mechanism for property modification.
  • The additives exhibit self-stratification behavior, influencing interfacial properties.
  • Cocrystallization with the polyethylene matrix occurs when melting temperatures are close, maintaining surface excess.