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Cellulose

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01.10.2013 | Original Paper

Liquid crystalline thermosets based on anisotropic phases of cellulose nanocrystals

verfasst von: Justin O. Zoppe, Lucas Grosset, Jukka Seppälä

Erschienen in: Cellulose | Ausgabe 5/2013

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Abstract

A new class of liquid crystalline thermosets (LCTs) was successfully produced containing lyotropic cellulose nanocrystals (CNCs) as the primary mesogenic component (up to 72 wt%) by the addition of non-mesogenic epoxy monomers. Cellulose-based LCTs were produced by totally aqueous processing methods and ultimately cured at elevated temperatures to produce ordered networks of ‘frozen’ liquid crystalline (LC) phases. Various degrees of birefringence were obtained via self-assembly of CNCs into oriented phases as observed by polarized optical microscopy and transmission electron microscopy. X-ray diffraction measurements highlighted the effects of texture of CNCs within LCT films compared to lyophilized CNCs. Cellulose-based LCT films uniquely exhibited thermo-mechanical properties of both traditional LCTs and LC elastomers, such as high elastic modulus (~1 GPa) under ambient conditions and low glass transition temperature (~−25 °C), respectively. The development of LCTs based on CNCs and aqueous processing methods provides a renewable pathway for designing high performance composites with ordered network structures and unique optical properties.

Vorheriger Artikel Production of microfibrillated cellulose from unbleached kraft pulp of Kenaf and Scotch Pine and its effect on the properties of hardwood kraft: microfibrillated cellulose paper

Nächster Artikel Effects of emulsifier on the bonding performance and freeze–thaw stability of starch-based wood adhesive

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Titel: Liquid crystalline thermosets based on anisotropic phases of cellulose nanocrystals
verfasst von: Justin O. Zoppe
Lucas Grosset
Jukka Seppälä
Publikationsdatum: 01.10.2013
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 5/2013
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-013-0008-2

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