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Composite Masonry Walls01:18

Composite Masonry Walls

Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...

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Related Experiment Video

Updated: Jul 24, 2026

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces
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Polyamide 11 Composites with Surface-Activated Intact Mica Structures for Advanced Applications.

Erika Varga1, Ferenc Palásti1, Attila Bata1

  • 1Department of Innovative Vehicles and Materials, GAMF Faculty of Engineering and Computer Science, John von Neumann University, 10 Izsáki Street, 6000 Kecskemét, Hungary.

Polymers
|November 13, 2025
PubMed
Summary

This study enhanced bio-based polyamide 11 (PA11) using mica fillers, improving stiffness and reducing water uptake. Filler concentration and size were key, more than surface treatment, for property modification.

Keywords:
PA11SEMmicastrengthtranscrystallization

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Bio-based polyamide 11 (PA11) shows promise for industrial applications.
  • Enhancing PA11's mechanical properties is crucial for broader adoption.
  • Natural and surface-treated mica can be used as fillers to modify polymer properties.

Purpose of the Study:

  • To investigate the effect of natural and surface-treated mica fillers on the mechanical properties of PA11.
  • To determine the optimal filler concentration and dimensions for property enhancement.
  • To understand the influence of mica surface treatment on PA11's characteristics.

Main Methods:

  • Incorporation of mica (1, 2, 5 wt%) into PA11 matrix.
  • Mechanical property testing (impact strength, flexural modulus, elastic modulus).
  • Water uptake analysis, Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Dynamic Mechanical Analysis (DMA), and X-ray Diffraction (XRD).

Main Results:

  • Water uptake decreased by up to 4%, with surface treatment having an unfavorable effect.
  • Impact strength decreased, while stiffness and resistance to deformation improved with increased filler content.
  • Particle size influenced crystallinity; surface treatment promoted a mesophase, and DMA showed increased internal friction and a glass transition temperature of 36.6 °C.
  • XRD indicated changes in mica basal spacing due to silanization and compounding.

Conclusions:

  • Mica fillers can effectively modify PA11 properties for demanding applications.
  • Filler concentration and dimensions play a more significant role than surface characteristics.
  • This research offers a viable method for tailoring PA11 performance.