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Compounding of short fiber reinforced phenolic resin by using specific mechanical energy input as a process control parameter

Maertens, Robert; Liebig, Wilfried V. ORCID iD icon; Elsner, Peter; Weidenmann, Kay A.


For a newly developed thermoset injection molding process, glass fiber-reinforced phenolic molding compounds with fiber contents between 0 wt% and 60 wt% were compounded. To achieve a comparable remaining heat of the reaction in all compound formulations, the specific mechanical energy input (SME) during the twin-screw extruder compounding process was used as a control parameter. By adjusting the extruder screw speed and the material throughput, a constant SME into the resin was targeted. Validation measurements using differential scanning calorimetry showed that the remaining heat of the reaction was higher for the molding compounds with low glass fiber contents. It was concluded that the SME was not the only influencing factor on the resin crosslinking progress during the compounding. The material temperature and the residence time changed with the screw speed and throughput, and most likely influenced the curing. However, the SME was one of the major influence factors, and can serve as an at-line control parameter for reactive compounding processes. The mechanical characterization of the test specimens revealed a linear improvement in tensile strength up to a fiber content of 40–50 wt%. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000134283
Veröffentlicht am 26.06.2021
DOI: 10.3390/jcs5050127
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2504-477X
KITopen-ID: 1000134283
Erschienen in Journal of Composites Science
Verlag MDPI
Band 5
Heft 5
Seiten 127
Schlagwörter thermoset injection molding; reactive polymer compounding; glass fiber-reinforced polymers; phenolic molding compound; composite fiber content; composite fiber length
Nachgewiesen in Dimensions
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