Process Engineering

x-PET - Uniaxially oriented high-modulus and high-strength PET and PBT

Ref.-No. 4906

Keywords: PET = Polyethylenterephthalat, PBT = Polybutylenterephthalat, Polyethylene terephthalate, Polybutylene terephthalate

Therefore PET or PBT is crosslinked in the extruder with PA (phthalic anhydride) and TGDDM (tetraglycidyl-diaminodiphenylmethane) and then stretched from the melt.


  • Simple production
  • High-modulus
  • High-strength
  • Suitable for lightweight construction

Commercial Application

PET and PBT fibers are modern high-performance materials, which only obtain their good mechanical properties through targeted drawing from the melt. x-PET enables the production of thicker molded bodies by cross-linking the polymer by stretching it directly from the melt. So for the first time thicker, high-modulus and high-strength components can be produced as fibers (e.g. panels and profiles). The typical application is in the field of lightweight construction.

Status Quo

A European patent application for the invention has been filed. The components produced to date have a modulus of elasticity of over 14 GPa and a tensile strength of over 600 MPa.
On behalf of Technical University of Dortmund PROvendis offers companies licenses for the invention. Cooperation for further development is also conceivable.

Relevant Puclications

Th. Raidt et al.: “Crosslinking of Semiaromatic Polyesters toward High-Temperature Shape memory Polymers with full Recovery”, Macromol. Rapid. Commun. 2018, 39, 1700768.

An invention of TU Dortmund.

Dr. Joachim Kaiser
+49 208 9410523 also TU Dortmund: +49 231 7556421