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Sunday, 22 September 2019
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Raw materials & technologies, Raw materials, Coatings additives

Toughening an epoxy coating with hyperbranched polymers

Wednesday, 9 January 2013

Branching with amine functional groups harden epoxy coatings. Even more influence has the architecture of these polymers.

HBPs harden epoxy coatings

Source: Sulamith-Fotolia

HBPs harden epoxy coatings

Source: Sulamith-Fotolia

Hisham A. Essawy, National Research Center in Cairo, Egypt and his colleagues toughened a commercially available fast cure epoxy reactive blending. They formed hyperbranched polymers (HBPs) that exhibit variation in polarity and branching according to the relevant synthesis strategy employed for each polymer.

They observed an obvious progress in the performance with respect to a control sample without any HBP in the mechanical properties

  • impact resistance,
  • pull-off adhesion,
  • and bending

 The results were explained on the light of the ability of this class of materials to impose flexibility. They dilute the intensive crosslink density associated frequently with the rapid curing of epoxy systems.

Different architecture of HBPs influences the properties

The researchers prepared a homologous series of HBPs following a well-defined method. Furthermore they verified their formation in a polymeric form bearing different extents of branching with amine functional groups at the terminals using different techniques, such as

  • Fourier Transform Infrared,
  • 1H Nuclear Magnetic Resonance,
  • Differential Scanning Calorimetry,
  • and Gel Permeation Chromatography.

The extent of gained enhancement for each formulation was accounted for by the molecular architecture of the HBPs, their degrees of branching, polarity, and relative reactive contents of primary amino groups in each case. In addition, the influence of these parameters on a proper wetting over the substrate and morphology of the films in each case was also studied using scanning electron microscopy.

 This study was published in the Journal of Applied Polymer Science, 2013

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