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Polymer Classification: Architecture01:14

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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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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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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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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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Background data for modulus mapping high-performance polyethylene fiber morphologies.

Kenneth E Strawhecker1, Emil J Sandoz-Rosado1, Taylor A Stockdale1

  • 1U.S. Army Research Laboratory, RDRL-WMM-G, Aberdeen Proving Ground, MD 21005-5069, USA.

Data in Brief
|January 5, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals the interior morphology of ultra-high-molecular-weight polyethylene (UHMWPE) fibers using multi-frequency atomic force microscopy. Modulus mapping demonstrates elastic and plastic deformation within the fibers.

Keywords:
AMFMAtomic force microscopyModulus mappingUHMWPEUltra-high-molecular-weight Polyethylene

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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Science

Background:

  • High-performance polyethylene fibers exhibit complex internal structures.
  • Atomic force microscopy (AFM) is a powerful tool for nanoscale surface characterization.
  • Understanding fiber morphology is crucial for optimizing material properties.

Purpose of the Study:

  • To investigate the interior morphology of ultra-high-molecular-weight polyethylene (UHMWPE) fibers.
  • To apply multi-frequency (AMFM) atomic force microscopy for modulus mapping.
  • To correlate mechanical properties with fiber structure.

Main Methods:

  • Utilized multi-frequency (AMFM) atomic force microscopy.
  • Acquired cantilever dynamics and force-distance spectra in AC and contact modes.
  • Employed Hertzian contact mechanics model within AMFM framework.
  • Mapped topography and frequency shift (stiffness) of UHMWPE fibers.

Main Results:

  • Demonstrated the application of AMFM for modulus mapping of UHMWPE fibers.
  • Presented force-distance data for Polystyrene reference and UHMWPE samples.
  • Generated topography and stiffness maps revealing localized deformation.
  • Identified regions of elastic versus plastic deformation within the fibers.

Conclusions:

  • AMFM modulus mapping effectively elucidates the interior morphology of UHMWPE fibers.
  • The study provides a framework for analyzing fiber mechanical properties at the nanoscale.
  • Results offer insights into deformation mechanisms in high-performance polymers.