Superior Reinforcement Effect of TEMPO-Oxidized Cellulose Nanofibrils in Polystyrene Matrix: Optical, Thermal, and Mechanical Studies

2012 ◽  
Vol 13 (7) ◽  
pp. 2188-2194 ◽  
Author(s):  
Shuji Fujisawa ◽  
Tomoyasu Ikeuchi ◽  
Miyuki Takeuchi ◽  
Tsuguyuki Saito ◽  
Akira Isogai
Keyword(s):  
Cellulose Nanofibrils ◽  
Oxidized Cellulose ◽  
Reinforcement Effect ◽  
Polystyrene Matrix ◽  
Mechanical Studies

scholarly journals Rapid Water Softening with TEMPO-Oxidized/Phosphorylated Nanopapers

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 136 ◽  
Author(s):  
Andreas Mautner ◽  
Thawanrat Kobkeatthawin ◽  
Florian Mayer ◽  
Christof Plessl ◽  
Selestina Gorgieva ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Cellulose Nanofibrils ◽  
Water Hardness ◽  
Organic Liquids ◽  
Oxidized Cellulose ◽  
Water Softening ◽  
Aqueous Suspensions ◽  
Overall Performance ◽  
Exchange Resins ◽  
Very High

Water hardness not only constitutes a significant hazard for the functionality of water infrastructure but is also associated with health concerns. Commonly, water hardness is tackled with synthetic ion-exchange resins or membranes that have the drawbacks of requiring the awkward disposal of saturated materials and being based on fossil resources. In this work, we present a renewable nanopaper for the purpose of water softening prepared from phosphorylated TEMPO-oxidized cellulose nanofibrils (PT-CNF). Nanopapers were prepared from CNF suspensions in water (PT-CNF nanopapers) or low surface tension organic liquids (ethanol), named EPT-CNF nanopapers, respectively. Nanopaper preparation from ethanol resulted in a significantly increased porosity of the nanopapers enabling much higher permeances: more than 10,000× higher as compared to nanopapers from aqueous suspensions. The adsorption capacity for Ca2+ of nanopapers from aqueous suspensions was 17 mg g−1 and 5 mg g−1 for Mg2+; however, EPT-CNF nanopapers adsorbed more than 90 mg g−1 Ca2+ and almost 70 mg g−1 Mg2+. The higher adsorption capacity was a result of the increased accessibility of functional groups in the bulk of the nanopapers caused by the higher porosity of nanopapers prepared from ethanol. The combination of very high permeance and adsorption capacity constitutes a high overall performance of these nanopapers in water softening applications.

Mechanical Enhancement of Cellulose Nanofibril (CNF) Films Through the Addition of Water-soluble Polymers

2021 ◽  
Author(s):  
Endrina Stefani Forti ◽  
Sami M El Awad ◽  
Xin Y Ng ◽  
Whirang Cho ◽  
Gregory T Schueneman ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Cellulose Nanofibrils ◽  
Water Soluble ◽  
Oxidized Cellulose ◽  
Solution Casting ◽  
Toughening Mechanism ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Carboxylate Groups ◽  
Cnf Films

Abstract In this work, water-soluble polymers were screened through solution casting and polyvinyl alcohol (PVA) and poly(2-ethyl-2-oxazoline) (PEOX) were found as reinforcement agents for cellulose nanofibrils (CNFs) films. Mechanical property increases of 99% in elastic modulus, 93% in the ultimate tensile strength (UTS) and 134% in the work of failure (WOF) were reported for TEMPO-oxidized cellulose nanofibrils (TOCNF) with 0.44 mmol/g carboxylate groups and 15 wt.% PVA. PEOX had a higher elastic modulus increase of 113%, yet lower UTS and WOF increases were found at 63% and 28%, respectively. Additionally, increases in UTS and elastic modulus were also seen in mechanically fibrillated CNF and TOCNFs with higher carboxylate contents (1.5 mmol/g). The toughening mechanism was attributed to the formation of strong hydrogen bonding between the CNFs and the hydrophilic polymers added. The presence of such mechanisms was indirectly confirmed by tensile testing, zeta potential and rheology.

scholarly journals Alcohol induced gelation of TEMPO-oxidized cellulose nanofibril dispersions

Soft Matter ◽  
2018 ◽  
Vol 14 (45) ◽  
pp. 9243-9249 ◽  
Author(s):  
Marcelo A. da Silva ◽  
Vincenzo Calabrese ◽  
Julien Schmitt ◽  
Duygu Celebi ◽  
Janet L. Scott ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cellulose Nanofibrils ◽  
Oxidized Cellulose ◽  
Cellulose Nanofibril ◽  
Alcoholic Mixtures

Alcohol-induced gelation of partially oxidised cellulose nanofibrils (OCNFs): nanoscale (SAXS) and macroscale (rheology) insights into OCNF self-assembly in aqueous-alcoholic mixtures.

scholarly journals The potential of TEMPO-oxidized cellulose nanofibrils as rheology modifiers in food systems

Cellulose ◽  
2019 ◽  
Vol 26 (9) ◽  
pp. 5483-5496 ◽  
Author(s):  
Ragnhild Aaen ◽  
Sébastien Simon ◽  
Fredrik Wernersson Brodin ◽  
Kristin Syverud
Keyword(s):  
Food Systems ◽  
Cellulose Nanofibrils ◽  
Oxidized Cellulose

Dispersion stability and aggregation behavior of TEMPO-oxidized cellulose nanofibrils in water as a function of salt addition

Cellulose ◽  
2014 ◽  
Vol 21 (3) ◽  
pp. 1553-1559 ◽  
Author(s):  
Hayaka Fukuzumi ◽  
Reina Tanaka ◽  
Tsuguyuki Saito ◽  
Akira Isogai
Keyword(s):  
Cellulose Nanofibrils ◽  
Aggregation Behavior ◽  
Dispersion Stability ◽  
Oxidized Cellulose ◽  
Salt Addition

Self-standing films of octadecylaminated-TEMPO-oxidized cellulose nanofibrils with antifingerprint properties

2021 ◽  
Vol 256 ◽  
pp. 117536
Author(s):  
Nattinee Krathumkhet ◽  
Masaki Ujihara ◽  
Toyoko Imae
Keyword(s):  
Cellulose Nanofibrils ◽  
Oxidized Cellulose

Preparation and characterization of TEMPO-oxidized cellulose nanofibrils with ammonium carboxylate groups

2013 ◽  
Vol 59 ◽  
pp. 99-104 ◽  
Author(s):  
Michiko Shimizu ◽  
Hayaka Fukuzumi ◽  
Tsuguyuki Saito ◽  
Akira Isogai
Keyword(s):  
Cellulose Nanofibrils ◽  
Oxidized Cellulose ◽  
Carboxylate Groups

Molecular Mass and Molecular-Mass Distribution of TEMPO-Oxidized Celluloses and TEMPO-Oxidized Cellulose Nanofibrils

2015 ◽  
Vol 16 (2) ◽  
pp. 675-681 ◽  
Author(s):  
Ryoya Hiraoki ◽  
Yuko Ono ◽  
Tsuguyuki Saito ◽  
Akira Isogai
Keyword(s):  
Molecular Mass ◽  
Mass Distribution ◽  
Molecular Mass Distribution ◽  
Cellulose Nanofibrils ◽  
Oxidized Cellulose

Micro-mechanics of electrostatically stabilized suspensions of cellulose nanofibrils under steady state shear flow

Soft Matter ◽  
2016 ◽  
Vol 12 (6) ◽  
pp. 1721-1735 ◽  
Author(s):  
F. Martoïa ◽  
P. J. J. Dumont ◽  
L. Orgéas ◽  
M. N. Belgacem ◽  
J.-L. Putaux
Keyword(s):  
Steady State ◽  
Shear Flow ◽  
Cellulose Nanofibrils ◽  
Oxidized Cellulose ◽  
Cellulose Nanofibril ◽  
Aqueous Suspensions

In this study, we characterized and modeled the rheology of TEMPO-oxidized cellulose nanofibril (NFC) aqueous suspensions with electrostatically stabilized and unflocculated nanofibrous structures.

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