New Approach for the Fabrication of Carboxymethyl Cellulose Nanofibrils and the Reinforcement Effect in Water-Borne Polyurethane

2019 ◽  
Vol 7 (13) ◽  
pp. 11850-11860 ◽  
Author(s):  
Dan Cheng ◽  
Pingdong Wei ◽  
Lina Zhang ◽  
Jie Cai
Keyword(s):  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Reinforcement Effect ◽  
New Approach ◽  
Water Borne

scholarly journals Nanoarchitectonics for High Adsorption Capacity Carboxymethyl Cellulose Nanofibrils-Based Adsorbents for Efficient Cu2+ Removal

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 160
Author(s):  
Rongrong Si ◽  
Yehong Chen ◽  
Daiqi Wang ◽  
Dongmei Yu ◽  
Qijun Ding ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Maximum Adsorption Capacity ◽  
Crosslinking Reaction ◽  
Carboxyl Content ◽  
Edta Solution ◽  
Effects Of Ph ◽  
Adsorption Desorption

In the present study, carboxymethyl cellulose nanofibrils (CMCNFs) with different carboxyl content (0.99–2.01 mmol/g) were prepared via controlling the ratio of monochloroacetic acid (MCA) and sodium hydroxide to Eucalyptus bleached pulp (EBP). CMCFs-PEI aerogels were obtained using the crosslinking reaction of polyethyleneimine (PEI) and CMCNFs with the aid of glutaraldehyde (GA). The effects of pH, contact time, temperature, and initial Cu2+ concentration on the Cu2+ removal performance of CMCNFs-PEI aerogels was highlighted. Experimental data showed that the maximum adsorption capacity of CMCNF30-PEI for Cu2+ was 380.03 ± 23 mg/g, and the adsorption results were consistent with Langmuir isotherm (R2 > 0.99). The theoretical maximum adsorption capacity was 616.48 mg/g. After being treated with 0.05 M EDTA solution, the aerogel retained an 85% removal performance after three adsorption–desorption cycles. X-ray photoelectron spectroscopy (XPS) results demonstrated that complexation was the main Cu2+ adsorption mechanism. The excellent Cu2+ adsorption capacity of CMCNFs-PEI aerogels provided another avenue for the utilization of cellulose nanofibrils in the wastewater treatment field.

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

Controlled Dispersion and Setting of Cellulose Nanofibril (CNF) - Carboxymethyl Cellulose (CMC) Pastes

2021 ◽  
Author(s):  
Sami Miguel El Awad Azrak ◽  
Jared Gohl ◽  
Robert Moon ◽  
Gregory Schueneman ◽  
Chelsea Davis ◽  
...  
Keyword(s):  
Chemical Treatment ◽  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Ftir Analysis ◽  
Screw Extruder ◽  
Absorption Bands ◽  
Wet Strength ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Charge Change

Abstract This work investigated the redispersion and setting behavior of highly loaded (~18 wt.% solids in water) pastes of cellulose nanofibrils (CNFs) with carboxymethyl cellulose (CMC). A single-screw extruder was used to continuously process CNF+CMC pastes into cord. The adsorption of CMC onto the CNF fibrils was assessed through zeta potential and titration which revealed a surface charge change of ~61 % from -36.8 mV and 0.094 mmol/g COOH for pure CNF to -58.1 mV and 0.166 mmol/g COOH for CNF+CMC with a CMC degree of substitution of 0.9. Dried CNF with adsorbed CMC was found to be fully redispersible in water and re-extruded back into a cord without any difficulties. On the other hand, chemical treatment with hydrochloric acid, a carbodiimide crosslinker, or two wet strength enhancers (polyamide epichlorohydrin and polyamine epichlorohydrin) completely suppressed the dispersibility previously observed for dried-untreated CNF+CMC. Turbidity was used to quantify the level of redispersion or setting achieved by the untreated and chemically treated CNF+CMC in both water and a strong alkaline solution (0.1 M NaOH). Depending on the chemical treatment used, FTIR analysis revealed the presence of ester, N-acyl urea, and anhydride absorption bands which were attributed to newly formed linkages between CNF fibrils, possibly explaining the suppressed redispersion behavior. Water uptake of the differently treated and dried CNF+CMC materials agreed with both turbidity and FTIR results.

Carboxymethyl Cellulose Nanofibrils with a Treelike Matrix: Preparation and Behavior of Pickering Emulsions Stabilization

2019 ◽  
Vol 7 (15) ◽  
pp. 12887-12896 ◽  
Author(s):  
Jie Wei ◽  
Yi Zhou ◽  
Yanyan Lv ◽  
Jianquan Wang ◽  
Chao Jia ◽  
...  
Keyword(s):  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Pickering Emulsions ◽  
And Behavior ◽  
Matrix Preparation

scholarly journals Carboxymethyl Cellulose Enhanced Production of Cellulose Nanofibrils

Fibers ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 57
Author(s):  
Yunsang Kim ◽  
Lauren T. McCoy ◽  
Corbin Feit ◽  
Shuaib A. Mubarak ◽  
Suraj Sharma ◽  
...  
Keyword(s):  
Carboxymethyl Cellulose ◽  
Kraft Pulp ◽  
Cellulose Nanofibrils ◽  
High Pressure Homogenization ◽  
High Quality ◽  
Molecular Weights ◽  
Enhanced Production ◽  
Low Toxicity ◽  
High Level ◽  
High Degree

Cellulose nanofibrils (CNF) were produced by high-pressure homogenization from kraft pulp in the presence of carboxymethyl cellulose (CMC) of varying molecular weights. CNF pretreated with 250 kD CMC exhibited the maximum specific surface area (SSA) of 641 m2/g, which is comparable to that of CNF pretreated by 2,2,6,6-tetramethyl-piperidinyl-1-oxyl (TEMPO)-meditated oxidation with a high degree of fibrillation. Rheological and microscopic analyses also indicated a high level of fibrillation for the CMC-pretreated CNF. In contrast, the reference CNF without the CMC pretreatment showed a lower level of fibrillation, which was reflected in decreased viscosity and the reduction of SSA by a factor of 19. With the high-degree fibrillation and low toxicity, the CMC pretreatment is a promising method for the production of high-quality CNF in an environmentally friendly way.

Mechanical and Structural Properties of Maltodextrin/Agarose Microgels Composites

2007 ◽  
Vol 17 (3) ◽  
pp. 31412-1-31412-13 ◽  
Author(s):  
Chrystel Loret ◽  
William J. Frith ◽  
Peter J. Fryer
Keyword(s):  
Mechanical Properties ◽  
Droplet Size ◽  
Dispersed Phase ◽  
Phase Volume ◽  
Reinforcement Effect ◽  
Modulus Ratio ◽  
New Approach ◽  
Mechanical And Structural Properties ◽  
Observed Behaviour ◽  
Composite Properties

Abstract We present results from a new approach to the study of multicomponent gels, which allows independent investigation of the effect of phase volume and droplet size of the dispersed phase on the mechanical properties of the mixed gel composites. The method involves preparation of agarose microgels with different sizes, which are then embedded in maltodextrin gel matrices with different gel strengths. The effects of both phase volume and droplet size on composite properties are dependent on the phase modulus ratio. The higher the phase modulus ratio, the larger is the reinforcement effect and the effect of droplet size on mechanical properties of the maltodextrin/agarose composites. The observed behaviour was compared with literature models for the behaviour of composite materials.

Effects of cellulose nanofibrils on dialdehyde carboxymethyl cellulose based dual responsive self-healing hydrogel

Cellulose ◽  
2019 ◽  
Vol 26 (16) ◽  
pp. 8813-8827 ◽  
Author(s):  
Ying Wang ◽  
Guifa Xiao ◽  
Yangyang Peng ◽  
Liheng Chen ◽  
Shiyu Fu
Keyword(s):  
Carboxymethyl Cellulose ◽  
Cellulose Nanofibrils ◽  
Self Healing ◽  
Dual Responsive
Sign in / Sign up

Export Citation Format

Share Document