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A new process for the formation of bi- or multi-axially oriented polymer structures has been developed. In this process, the polymer is firstly crosslinked low, then melted and at last crystallized in the stretched state. As a result, a part of the crystals formed parallel to the direction of elongation while another part crystallizes approximately perpendicular to it (homoepitaxy). The degree of biaxial orientation can be controlled over the extend of stretching during crystallization.
Keywords: Polymer, Polypropylen, iPP, Folien, Platten, Leichtbau Polymer, polypropylene, iPP, foils, boards, lightweigt
The invention enables a thickness-independent homogeneous biaxial orientation and thus a considerable biaxial mechanical reinforcement of polymers such as, for example, isotactic poly(propylene) (iPP). Possible technical applications are highly loadable lightweight boards or profiles.
An European patent application for this invention has been filed. As an exemplary embodiment, iPP was oriented multiaxially by crystallization upon uniaxial stretching. Detailed experimental data are available. On behalf of the TU Dortmund, PROvendis is seeking a licensee for the new technology.
1. T. Raidt et al.: „Chemical Cross-linking of Polypropylenes Towards New Shape Memory Polymers“, Macromol. Rapid Commun. 2015, 36, 744-749.
2. T. Raidt, et al.: „Multiaxial Reinforcement of Cross-Linked Isotactic Polypropylene upon Uniaxial Stretching“, Macromol. Mater. Eng. 2017, 302, 1600308