Network swelling of TEMPO-oxidized nanocellulose

Holzforschung ◽  
2015 ◽  
Vol 69 (2) ◽  
pp. 207-213 ◽  
Author(s):  
Thad C. Maloney
Keyword(s):  
Differential Scanning Calorimetry ◽  
Water Retention ◽  
Nanofibrillated Cellulose ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Scanning Calorimetry ◽  
Feasible Method ◽  
Centrifugal Method ◽  
Solute Exclusion ◽  
Fiber Matrix

Abstract: This study examines the swelling of TEMPO-oxidized nanofibrillated cellulose (NFCTEMPO, shortly NFC) on both the particle and interparticle levels. The sum of the intraparticle and interparticle swelling is referred to as the network swelling. A centrifugal method, based on a modification of the water retention value test, was used to measure the network swelling of NFC, a pigment, and some pulp fibers. It was found that the network swelling of NFC is highly dependent on its concentration within a fiber matrix. The particle swelling of NFC and pulp fibers was analyzed by differential scanning calorimetry (DSC) and solute exclusion. The counterion for the NFC varied among the Na+, H+, and Ca2+ forms. The counterion has a very large effect on the particle and network swelling of NFC, with Ca2+ giving the lowest swelling and Na+ the highest swelling. An industrially feasible method for changing the counterion of NFC from the nominal Na+ to the Ca2+ form, and thus improving dewatering properties, is given.

Mercerization and Characterization of Straw Pulp Fibers

2013 ◽  
Vol 781-784 ◽  
pp. 2645-2649
Author(s):  
Yan Na Yin ◽  
Quan Xiao Liu ◽  
Yu Bin Lyu
Keyword(s):  
Cell Wall ◽  
Processing Time ◽  
Water Retention ◽  
Fiber Cell ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Treatment Conditions ◽  
Fiber Cell Wall

Effects of mercerizing treatment on water-retention value of straw pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 4mol/L, temperature of 40°C and processing time of 60min. SEM showed that the fiber cell wall swelling increase after mercerization.

Study on Effort of Ultrasonic Treatment on Water Retention Value of Pulp Fiber

2014 ◽  
Vol 1030-1032 ◽  
pp. 458-461
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Wen Cai Xu
Keyword(s):  
Ultrasonic Treatment ◽  
Processing Time ◽  
Water Retention ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Ultrasonic Power ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Absorbent Cotton ◽  
Coniferous Wood

Effects of ultrasonic processing conditions on water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber were discussed. Results showed that ultrasonic power and processing time have an significant impact on water retention value of three kinds of pulp, the effort of ultrasonic treatment temperature on water retention value of three kinds of pulp is less. The water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber, respectively, reach the maximum at power of 300W, 500W, 400W, and processing time of 60min, 120min, 60min.

Thermal Energy Storage System of Sulfate / Fiber Matrix Composite

2008 ◽  
Vol 368-372 ◽  
pp. 1077-1079 ◽  
Author(s):  
Xue Tan Ren ◽  
Ling Ke Zeng ◽  
Ping An Liu ◽  
Hui Wang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Molten Salts ◽  
Heating Process ◽  
Storage Material ◽  
Scanning Calorimetry ◽  
Fiber Matrix

The K2SO4-Na2SO4 system was studied by differential scanning calorimetry (DSC) with the aim of developing a new phase-change thermal energy storage material. The temperature range of phase change is from 800°C to 1069°C according to the phase diagram. A new shape-stabilized phase-change material made of molten salts impregnated by capillary forces in a porous-fiber matrix was presented. These materials were characterized by X-ray diffraction analysis and differential scanning calorimetry analysis. The results indicated that the compound included 70~80% of molten salts, meanwhile the heat storage material could keep its shape without any leakage during the heating process.

Study on Mercerization Orthogonal Experiment of Coniferous Wood Pulp Fiber

2014 ◽  
Vol 1030-1032 ◽  
pp. 454-457
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Wen Cai Xu
Keyword(s):  
Water Retention ◽  
Orthogonal Experiment ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Treatment Conditions ◽  
Fiber Cell Wall ◽  
Coniferous Wood ◽  
Wood Pulp Fiber

Effects of mercerizing treatment on water-retention value of bleaching coniferous wood pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 7mol/L, temperature of 40°C and processing time of 100min. SEM showed that the fiber cell wall swelling increase after mercerization.

The correlation between the water retention values of fibers by the centrifugation method and maximum content of fiber bonding water by the headspace GC method

2019 ◽  
Vol 34 (3) ◽  
pp. 304-309 ◽  
Author(s):  
Ruo-Yun Wang ◽  
Wen-Xuan Mo ◽  
Xiao-Nin Shen ◽  
Bo Li ◽  
Xin-Sheng Chai
Keyword(s):  
Gas Chromatography ◽  
Water Retention ◽  
Headspace Gas Chromatography ◽  
Pulp Fibers ◽  
Excellent Correlation ◽  
Water Retention Value ◽  
Headspace Gas ◽  
Centrifugation Method ◽  
Maximum Content ◽  
Headspace Gc

Abstract This work conducted an investigation on the water retention value (WRV) of pulp fibers measured by the conventional centrifugation method (with a screen filter) and the maximum content of fiber bonding water (MCFBW) measured by a headspace gas chromatography (HS-GC), a method with no fine loss, developed recently. The results showed there is an excellent correlation ({R^{2}}=0.988) between these two methods. However, the WRVs measured by the centrifugation method are consistent lower than the MCFBWs from the HS-GC method and the absolute differences were significantly increases for the refined pulp fibers, i. e., about 50–70 compared to 30+ for the pulps without treatment. The information from this study provides the insight of the real WRVs of the pulps from different processes.

Preparation and Properties of Straw Pulp Fiber/Magnetic Nano-Composites

2013 ◽  
Vol 781-784 ◽  
pp. 2641-2644 ◽  
Author(s):  
Quan Xiao Liu ◽  
Yan Na Yin ◽  
Yu Bin Lyu
Keyword(s):  
Ultrasonic Treatment ◽  
Processing Time ◽  
Water Retention ◽  
Magnetic Particles ◽  
Pulp Fiber ◽  
Ultrasonic Power ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Fiber Cells ◽  
Treatment Conditions

Effects of ultrasonic treatment on water-retention value of straw pulp fibers were discussed and the ultrasonic treatment conditions were optimized. The best conditions of ultrasonic treatment as follows: ultrasonic power is 400W, processing time is 90min and temperature is 40°C. SEM shows that a large number of magnetic particles were left inside the pulp fiber cells. Automated Surface Area & Pore Size Analyzer shows a good superparamagnetic behavior.

scholarly journals Study on the improvement of hydrophilic character on polyvinylalcohol treated polyester fabric

2014 ◽  
Vol 16 (4) ◽  
pp. 21-27
Author(s):  
Pitchai S. ◽  
Jeyakodi Moses J. ◽  
Swarna Natarajan
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Water Retention ◽  
Polyester Fabric ◽  
Spot Test ◽  
Disperse Dye ◽  
Scanning Calorimetry ◽  
Pet Fabric ◽  
Hydrophilic Character ◽  
Scanning Electron

Abstract Polyester fabric was treated with polyvinyl alcohol in alkaline medium. The moisture regain, water retention and wettability of the PVA treated polyester fabric were tested. The PVA treated PET fabric was dyed with disperse dye. The presence of PVA in the treated PET fabric was assessed by spot test. The treated fabric was also characterized by scanning electron microscope, FTIR and differential scanning calorimetry. The PVA treated polyester fabric showed improved hydrophilic character over intact and sodium hydroxide treated PET fabrics.

Sign in / Sign up

Export Citation Format

Share Document