TU Darmstadt / ULB / TUbiblio

Development of a Lignin Substituted Thermoset for Fiber Reinforced Polymers

Mehlhase, Sabrina (2016):
Development of a Lignin Substituted Thermoset for Fiber Reinforced Polymers.
Darmstadt, Technische Universität, [Online-Edition: http://tuprints.ulb.tu-darmstadt.de/5521],
[Ph.D. Thesis]

Abstract

The scope of this work is to introduce the by-product material lignin of the industrial pulping process in a completely new value chain of fiber reinforced polymers. Due to its natural origin the use of lignin in conventional applications is limited because of process impurities such as sulfur contamination, chemical inhomogeneities arising from a non-uniform feedstock and the complexity of its characterization. However, lignin presents a renewable source for bulking agents which possess manifold possibilities compared to conventional wooden derivatives such as wood flour or wood fibers. It is possible to adjust fusibility, glass transition temperatures and solubility by the variation of the molecular weight of the lignin. In addition, the chemical functionality of lignin can be specifically defined as required for an application. Searching for new valuable markets for lignin, fiber reinforced polymers were found to be of particular interest. Especially epoxy based thermosets seem highly promising. An easy and inexpensive method to produce fiber reinforced plastics is the wet lay-up process. This technique combined with newly developed lignin filled epoxy resins provides a new set of materials with interesting properties.

Item Type: Ph.D. Thesis
Erschienen: 2016
Creators: Mehlhase, Sabrina
Title: Development of a Lignin Substituted Thermoset for Fiber Reinforced Polymers
Language: English
Abstract:

The scope of this work is to introduce the by-product material lignin of the industrial pulping process in a completely new value chain of fiber reinforced polymers. Due to its natural origin the use of lignin in conventional applications is limited because of process impurities such as sulfur contamination, chemical inhomogeneities arising from a non-uniform feedstock and the complexity of its characterization. However, lignin presents a renewable source for bulking agents which possess manifold possibilities compared to conventional wooden derivatives such as wood flour or wood fibers. It is possible to adjust fusibility, glass transition temperatures and solubility by the variation of the molecular weight of the lignin. In addition, the chemical functionality of lignin can be specifically defined as required for an application. Searching for new valuable markets for lignin, fiber reinforced polymers were found to be of particular interest. Especially epoxy based thermosets seem highly promising. An easy and inexpensive method to produce fiber reinforced plastics is the wet lay-up process. This technique combined with newly developed lignin filled epoxy resins provides a new set of materials with interesting properties.

Place of Publication: Darmstadt
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Makromolekulare Chemie
Date Deposited: 26 Jun 2016 19:55
Official URL: http://tuprints.ulb.tu-darmstadt.de/5521
URN: urn:nbn:de:tuda-tuprints-55217
Referees: Rehahn, Prof. Dr. Matthias and Biesalski, Prof. Dr. Markus
Refereed / Verteidigung / mdl. Prüfung: 2 May 2016
Alternative Abstract:
Alternative abstract Language
Ziel dieser Arbeit stellt das Einbringen des aus der Papierherstellung gewonnenen Nebenprodukts Lignin in eine neue Wertschöpfungskette von faserverstärkten Kunststoffen dar. Durch seine natürliche Herkunft ist der Nutzen von Lignin in konventionellen Anwendungen begrenzt durch Prozessverunreinigungen wie z.B. Schwefelkontamination, Inhomogenitäten durch das uneinheitliche Rohmaterial und die schwierige Charakterisierung. Jedoch bietet Lignin eine erneuerbare Quelle für Füllstoffe mit vielseitigen Möglichkeiten im Vergleich zu konventionellen Holzderivaten wie Holzmehl und Holzfasern. Schmelztemperaturen, Glasübergangstemperaturen und Löslichkeit im Zusammenhang mit dem Molekulargewicht des Lignin können einfach angepasst werden. Außerdem können die Funktionalitäten des Lignins je nach Anwendungsgebiet angepasst werden. Bei der Suche nach einem geeigneten Markt für Lignin erschienen faserverstärkte Kunststoffe besonders interessant, vor allem in der Form von Epoxid-basierten Duroplasten. Ein einfacher und preisgünstiger Weg zur Herstellung von faserverstärkten Kunststoffen ist der Handlaminierprozess. Diese Methode kombiniert mit neu-entwickelten Lignin-gefüllten Epoxidharzen bietet eine neue Klasse an Materialien mit interessanten Eigenschaften.German
Export:

Optionen (nur für Redakteure)

View Item View Item