Analysis of "Polyurethane" type adhesives

Polyurethane adhesives (PU or PUr) are adhesives based on polymers and various additives. They are often used as two-component adhesives (2K) but also exist in one-component (1K). They are found in cartridge sealant, emulsion, solution, and hotmelts.

  • Two-component systems (2k) consist of a base (resin) and a hardener to be mixed in stoichiometric proportions. In the vast majority of cases, the base (resin) will consist of a prepolymer resulting from the polyaddition of a polyfunctionalized alcohol backbone (polyol, polyester, polyacrylic, etc.) and the hardener will consist of a mixture of diisocyanate (Toluene diisocyanate (TDI), Hexamethylene diisocyanate (HDI), Diphenylmethane diisocyanate (MDI), Isophorone diisocyanate (IPDI)…) and adjuvants (catalyst, accelerator, etc.).
  • One-component (1K) systems consist of a single component (usually in the form of cartridge sealant). They absorb moisture from the air after application which initiates crosslinking and curing.

Hot-melt polyurethanes are adhesives based on thermoplastic polymers.

Colle polyuréthane

Study of the composition of a Polyurethane material

PU adhesives are suitable for a wide range of materials and applications and are particularly suitable for combined bonding, i.e. bonding between different materials.

It is possible to perform structural analyzes by Pyrolysis/GCMS and IRTF to study the nature of the polymer matrix.

  • The adjuvants can be analyzed after solid / liquid extraction by GCMS and UPLC/TOF-MS .
  • The enthalpy and the polymerization temperatures as well as the glass transition temperature (Tg) can be obtained by thermal analysis by DSC.
  • Elemental analysis by SEM/EDX electron microscopy will allow dimensioning and determination of the nature of any charges.
  • Thermal analysis by TGA will give the contents of volatile fraction, polymer and residual charge.
Analyse structurale de colle polyester uréthane




Structural Analysis by Pyrolysis / GCMS of a Polyester urethane glue

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