Verbundwerkstoffe auf Basis vitrimerer Polymersysteme: Verarbeitungsverhalten und Umformanalyse

Research output: ThesisMaster's Thesis

Abstract

Vitrimers represent a class of polymers that combines the properties of non-crosslinked thermoplastics and tightly networked thermos-sets. Vitrimers contain so-called dynamic covalent bonds, which allow to weld, reshape, repair and recycle the thermoset materials by breaking and re-forming linkages above a certain temperature. Different vitrimeric resin systems are investigated and the most suitable system for the production and reshaping of fiber-reinforced specimens is selected. Pure resin specimens are produced to compare processing properties and the vitrimer potential of the individual materials. The specimens are produced by vacuum infusion. Based on preliminary tests and stress relaxation measurements, the parameters for reforming the specimens are determined. The influence of processing temperature, reshaping time and thickness of the specimen on the forming quality is investigated using full - factorial design of experiments. The forming quality is then characterized by repeatedly measuring the resulting angles on the part. The angles are measured directly after demolding and after heating the specimen above the glass transition temperature (Tg) to investigate whether the reshaping is permanent or not. If the behavior of the material is vitrimer-like, the new shape should be permanent, even above Tg. The results show that all three investigated factors have a significant effect on the reforming quality. The quality of the formed parts improves with increasing temperature, thickness and forming time. The experiments show that the forming of fiber-reinforced components is possible for the selected vitrimeric resin system. The quality of the reshaped parts can be influenced and optimized by the investigated factors.

Details

Translated title of the contributionComposites based on vitrimeric polymers: processing behavior and reshaping analysis
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
Supervisors/Advisors
Award date16 Dec 2022
DOIs
Publication statusPublished - 2022