scholarly journals High wet-strength, thermally stable and transparent TEMPO-oxidized cellulose nanofibril film via cross-linking with poly-amide epichlorohydrin resin

RSC Advances ◽  
2017 ◽  
Vol 7 (50) ◽  
pp. 31567-31573 ◽  
Author(s):  
Weisheng Yang ◽  
Huiyang Bian ◽  
Liang Jiao ◽  
Weibing Wu ◽  
Yulin Deng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Cellulose Nanofibrils ◽  
Cross Linking ◽  
Oxidized Cellulose ◽  
Thermally Stable ◽  
Cellulose Nanofibril ◽  
Wet Strength

TEMPO-oxidized cellulose nanofibrils (TOCNs) films cross-linked with different dosages of polyamide epichlorohydrin resin (PAE) show a great water-resistance and thermal stability.

The sol–gel transition of ultra-low solid content TEMPO-cellulose nanofibril/mixed-linkage β-glucan bionanocomposite gels

Soft Matter ◽  
2018 ◽  
Vol 14 (46) ◽  
pp. 9393-9401 ◽  
Author(s):  
Suvi Arola ◽  
Mahmoud Ansari ◽  
Antti Oksanen ◽  
Elias Retulainen ◽  
Savvas G. Hatzikiriakos ◽  
...  
Keyword(s):  
Plant Cell Wall ◽  
Sol Gel ◽  
Cellulose Nanofibrils ◽  
Solid Content ◽  
Cross Linking ◽  
Cell Wall Polysaccharide ◽  
Oxidized Cellulose ◽  
Cellulose Nanofibril ◽  
Sol Gel Transition ◽  
Gel Transition

Ultra-low solid content gels were prepared by physically cross-linking TEMPO-oxidized cellulose nanofibrils (TEMPO-CNF) with the plant-cell-wall polysaccharide, mixed-linkage β-glucan (MLG).

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.

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.

scholarly journals Studies on the Tanning with Glutaraldehyde as an Alternative to Traditional Chrome Tanning System for the Production of Chrome Free Leather

1970 ◽  
Vol 43 (4) ◽  
pp. 553-558 ◽  
Author(s):  
Dipankar Chakraborty ◽  
Ariful Hai Quadery ◽  
M Abul Kashem Azad
Keyword(s):  
Thermal Stability ◽  
Key Words ◽  
High Performance ◽  
Viable Alternative ◽  
Cross Linking ◽  
Thermally Stable ◽  
Chrome Tanning ◽  
Tanning Process

Chrome tanning is a versatile tanning system, but the pollution problems of chromium due to inadequacy of treatment systems and possible formation of Cr(VI), a carcinogen, have led to search for an ecofriendly and viable alternative tanning system. The present investigation focuses on the development of a novel, high performance and thermally stable aldehyde tannage system to produce chrome free leather by cross linking the NH2 groups of collagen with glutaraldehyde (CHO-CH2-CH2-CH2-CHO). After as usual soaking, liming, deliming, bating and pickling operations the pickle pelts were tanned with glutaraldehyde and other syntans. This developed chrome free tanning process produce crust leathers exhibiting thermal stability >85°C and reducing the TDS value with 0% emission of Cr-salt in tannery discharge. Key words: Eco friendly tanning system, Chrome free leather, Crust leathers   doi: 10.3329/bjsir.v43i4.2246   Bangladesh J. Sci. Ind. Res. 43(4), 553-558, 2008

scholarly journals Cellulose nanofibril core–shell silica coatings and their conversion into thermally stable nanotube aerogels

2015 ◽  
Vol 3 (30) ◽  
pp. 15745-15754 ◽  
Author(s):  
Dongming Liu ◽  
Qiong Wu ◽  
Richard L. Andersson ◽  
Mikael S. Hedenqvist ◽  
Stefano Farris ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Supercritical Drying ◽  
Core Shell ◽  
Low Density ◽  
Thermally Stable ◽  
Cellulose Nanofibril ◽  
Silica Coatings

Thermally stable, ultra-low density, silica-nanotube-based aerogels created via templating from cellulose nanofibrils without relying on energy intensive supercritical drying.

scholarly journals Improved Hydrophobicity of Macroalgae Biopolymer Film Incorporated with Kenaf Derived CNF Using Silane Coupling Agent

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2254
Author(s):  
Adeleke A. Oyekanmi ◽  
N. I. Saharudin ◽  
Che Mohamad Hazwan ◽  
Abdul Khalil H. P. S. ◽  
Niyi G. Olaiya ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Cellulose Nanofibrils ◽  
Hydroxyl Groups ◽  
Water Contact ◽  
Silane Coupling ◽  
Cnf Films ◽  
Kenaf Bast ◽  
Thermal Stability Of

Hydrophilic behaviour of carrageenan macroalgae biopolymer, due to hydroxyl groups, has limited its applications, especially for packaging. In this study, macroalgae were reinforced with cellulose nanofibrils (CNFs) isolated from kenaf bast fibres. The macroalgae CNF film was after that treated with silane for hydrophobicity enhancement. The wettability and functional properties of unmodified macroalgae CNF films were compared with silane-modified macroalgae CNF films. Characterisation of the unmodified and modified biopolymers films was investigated. The atomic force microscope (AFM), SEM morphology, tensile properties, water contact angle, and thermal behaviour of the biofilms showed that the incorporation of Kenaf bast CNF remarkably increased the strength, moisture resistance, and thermal stability of the macroalgae biopolymer films. Moreover, the films’ modification using a silane coupling agent further enhanced the strength and thermal stability of the films apart from improved water-resistance of the biopolymer films compared to unmodified films. The morphology and AFM showed good interfacial interaction of the components of the biopolymer films. The modified biopolymer films exhibited significantly improved hydrophobic properties compared to the unmodified films due to the enhanced dispersion resulting from the silane treatment. The improved biopolymer films can potentially be utilised as packaging materials.

scholarly journals Enzymatic and Chemical Cross-Linking of Bacterial Cellulose/Fish Collagen Composites—A Comparative Study

2021 ◽  
Vol 22 (7) ◽  
pp. 3346
Author(s):  
Agata Sommer ◽  
Paulina Dederko-Kantowicz ◽  
Hanna Staroszczyk ◽  
Sławomir Sommer ◽  
Marek Michalec
Keyword(s):  
Thermal Stability ◽  
Bacterial Cellulose ◽  
Secondary Alcohol ◽  
Water Vapor Permeability ◽  
Polymer Chains ◽  
Cross Linking ◽  
Vapor Permeability ◽  
Covalent Bonds ◽  
Fish Collagen ◽  
Chemical Cross Linking

This article compares the properties of bacterial cellulose/fish collagen composites (BC/Col) after enzymatic and chemical cross-linking. In our methodology, two transglutaminases are used for enzymatic cross-linking—one recommended for the meat and the other proposed for the fish industry—and pre-oxidated BC (oxBC) is used for chemical cross-linking. The structure of the obtained composites is characterized by scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, and Fourier transform infrared spectroscopy, and their functional properties by mechanical and water barrier tests. While polymer chains in uncross-linked BC/Col are intertwined by H-bonds, new covalent bonds in enzymatically cross-linked ones are formed—resulting in increased thermal stability and crystallinity of the material. The C2–C3 bonds cleavage in D-glucose units, due to BC oxidation, cause secondary alcohol groups to vanish in favor of the carbonyl groups’ formation, thus reducing the number of H-bonded OHs. Thermal stability and crystallinity of oxBC/Col remain lower than those of BC/Col. The BC/Col formation did not affect tensile strength and water vapor permeability of BC, but enzymatic cross-linking with TGGS improved them significantly.

scholarly journals Enhanced mechanical properties, water resistance, thermal stability, and biodegradation of the starch-sisal fibre composites with various fillers

2021 ◽  
Vol 198 ◽  
pp. 109373
Author(s):  
Maocheng Ji ◽  
Fangyi Li ◽  
Jianyong Li ◽  
Jianfeng Li ◽  
Chuanwei Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Water Resistance ◽  
Sisal Fibre ◽  
Fibre Composites
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