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Hochleistungs-PLA-Biko-Fasern: Pla² by Marx, Boris

Hochleistungs-PLA-Biko-Fasern: Pla²

by Boris Marx , Lars Bostan
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Book cover type: Paperback
  • ISBN13: 9783756214891
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Bod - Books on Demand
  • Publisher Imprint: Bod - Books on Demand
  • Publication Date:
  • Pages: 64
  • Original Price: USD 36.5
  • Language: German
  • Edition: N/A
  • Item Weight: 87 grams
  • BISAC Subject(s): Materials Science / General

Im Forschungsprojekt wurden zwei verschiedene PLA-Typen - reines PLLA und reines PDLA mit jeweils Schmelztemperaturen von 180 C - mittels Compoundierung im Technikumsma stab geblendet, um die PLA-Stereokomplexstruktur (scPLA) zu generieren. Dabei wurde mit einer innovativen Prozessführung das scPLA-Blend während der Extrusion mit einem Massedurchsatz vom 2 kg/h in Pulverform ausgefällt. Die Stereokomplex-Struktur konnte zu 100 % generiert und der Schmelzbereich im Thermogramm komplett um 55 C auf 235 C erhöht werden. Zwar konnte das scPLA-Blend zu einem Garn weiterverarbeitet werden, jedoch liegt die Festigkeit dieses Garns mit ca. 23 cN/tex weit unterhalb der Festigkeiten von PLA-Garnen, die derzeit auf dem Markt verfügbar sind. Die Begründung für das Nicht-Erreichen der angestrebten, hohen Festigkeit ist ein Entmischen das scPLA-Blends während der Extrusion. Eine Modifikation der klassischen Schmelzspinnanlage (u. a. Mischtorpedo und statische Mischer in der Schmelzeleitung) ist notwendig, um die Stereokomplex-Kristallstruktur während der Extrusion und beim Ausspinnen aufrechtzuerhalten bzw. weiter auszuprägen und damit die höhere Festigkeit generieren zu können. Dieser neu aufgetretene Entwicklungsaufwand sowie die Anlagenmodifikation konnten nicht im Rahmen des Forschungsprojektes realisiert werden. Mit auf dem Markt verfügbaren PLA-Materialien wurden Bikofasern mit einer Mantel-Kern-Struktur entwickelt. Dabei wurde ein teilkristallines PLA in den Kern und ein amorphes PLA in den Mantel geführt. Aus den Bikofasern wurden Single-Polymer-Faserverbundwerkstoffe und endlosfaserverstärkte Monofilamente für den 3D-Druck hergestellt. Dabei generiert der teilkristalline Kern die Festigkeit und mit dem amorphen Mantel kann die Form vorgegeben werden. Ebenso wurde die biologische Abbaubarkeit der verschiedenen PLA-Materialien in Faserform untersucht.

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