North Century Cellulose Technology Research and Development Co.

Beijing, China

North Century Cellulose Technology Research and Development Co.

Beijing, China

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Lan T.,Beijing Institute of Technology | Shao Z.-Q.,Beijing Institute of Technology | Wang W.-J.,Beijing Institute of Technology | Wang F.-J.,Beijing Institute of Technology | And 4 more authors.
Advanced Materials Research | Year: 2014

Nonwoven fibers of cellulose triacetate (CTA) were continuously electrospun by using DMSO/chloroform co-solvent system and the size and morphology of fibers were investigated. It was found that the concentration of 8wt% CTA fibers were obtained from DMSO/chloroform with volume ratio of 1:1, 3:2, 2:1, 3:1. The average diameters of CTA fiber was decreased with decreasing chloroform content in the mixed solvent. The minimum diameter of the continuous electrospun cellulose triacetate fibers obtained in this work ranged between 210 and 880 nm. © (2014) Trans Tech Publications, Switzerland.


Qin D.,Beijing Institute of Technology | Zhang D.,Beijing Institute of Technology | Shao Z.,Beijing Institute of Technology | Wang J.,Beijing Institute of Technology | And 3 more authors.
RSC Advances | Year: 2016

TEMPO-oxidized cellulose nanofibers (TOCNs) were blended with cellulose acetate (CA) to fabricate a high water flux ultrafiltration membrane. In order to further reduce the fouling behavior of the membrane, short-chain amino acids were selected as modifiers to graft onto the membrane surface. Some properties of modified membranes had been changed such as penetrability, contact angle, zeta potential, anti-fouling and mechanical properties. It was observed that the water flux of the TOCNs composite membrane was raised from 11.8 l m-2 h-1 to 123.4 l m-2 h-1, an over 10 times increment compared with unmodified CA membrane. As reinforcing nanofibers, TOCNs also have a positive impact for the modified membrane on mechanical properties. The tensile strength and elongation at break of the composite membrane were increased by 23.9% and 40.4%, respectively. After short-chain amino acids modification, little or even no variation had been found in the cross-section morphology and pore structure of the membrane. The flux recovery ratio (FRR) of lysine modified membrane was increased from 80.0% to 95.9%, while irreversible fouling loss (Rir) decreased from 20% to 4.1%. Grafting lysine onto the membrane effectively improved the resistance to protein fouling of the membrane, without sacrificing water flux and mechanical properties. © 2016 The Royal Society of Chemistry.


Lan T.,Beijing Institute of Technology | Shao Z.-Q.,Beijing Institute of Technology | Wang W.-J.,Beijing Institute of Technology | Wang F.-J.,Beijing Institute of Technology | And 4 more authors.
Journal of Applied Polymer Science | Year: 2014

Cellulose triacetate (CTA) nanofiber nonwoven mats were continuously electrospun by using mixed solvent of DMSO/chloroform system. The size and morphology of CTA nanofibers were investigated. It was found that CTA fibers with diameters in the range of 98 nm-1.81 μm were obtained from 8 wt % CTA solutions in 1: 1, 3: 2, 2: 1, 3: 1, 5: 1 and 7: 1 (v/v) DMSO/chloroform. The average diameter of CTA nanofiber was decreased and size distribution was narrowed with increasing the DMSO content in the mixed solvent. Smooth and uniform nanofibers with mean diameters of about 260 nm could be obtained from a solution of CTA in the binary system DMSO/chloroform 5: 1(v/v) at a polymer concentration of 8 wt %. © 2014 Wiley Periodicals, Inc.


Zhang Y.,Beijing Institute of Technology | Shao Z.,Beijing Institute of Technology | Gao K.,Beijing Institute of Technology | Wu X.,Beijing Institute of Technology | Liu Y.,North Century Cellulose Technology Research and Development Co.
Integrated Ferroelectrics | Year: 2014

A nanocomposite film of nitrate glycerol ether cellulose (NGEC)/graphene oxide (GO) was presented by a casting/evaporation technique. The effect of GO contents on mechanical properties of the NGEC/GO films was studied. Compared with pristine NGEC, the integration of 0.5 wt% GO resulted in 40%, 38% and 44% increase in Young's modulus, tensile strength and elongation at break of the NGEC/GO film. Copyright © 2014 Taylor & Francis Group, LLC.


Qiu L.,Beijing Institute of Technology | Qiu L.,Beijing Engineering Technology Research Center for Cellulose and Its Derivative Materials | Shao Z.,Beijing Institute of Technology | Shao Z.,Beijing Engineering Technology Research Center for Cellulose and Its Derivative Materials | And 5 more authors.
Carbohydrate Polymers | Year: 2014

New cellulose derivative CMC-Li was synthesized, and nanometer CMC-Li fiber was applied to lithium-ion battery and coated with AQ by electrospinning. Under the protection of inert gas, modified AQ/carbon nanofibers (CNF)/Li nanometer composite material was obtained by carbonization in 280 C as lithium battery anode materials for the first time. The morphologies and structures performance of materials were characterized by using IR, 1H NMR, SEM, CV and EIS, respectively. Specific capacity was increased from 197 to 226.4 mAh g -1 after modification for the first discharge at the rate of 2C. Irreversible reduction reaction peaks of modified material appeared between 1.5 and 1.7 V and the lowest oxidation reduction peak of the difference were 0.42 V, the polarization was weaker. Performance of cell with CMC-Li with the high degree of substitution (DS) was superior to that with low DS. Cellulose materials were applied to lithium battery to improve battery performance by electrospinning. © 2013 Elsevier Ltd.


Duan H.,Beijing Institute of Technology | Duan H.,North Century Cellulose Technology Research and Development Co. | Shao Z.,Beijing Institute of Technology | Shao Z.,North Century Cellulose Technology Research and Development Co. | And 4 more authors.
Carbohydrate Polymers | Year: 2016

Amphipathic coating basic film-forming material carboxymethyl cellulose nitrate ester (CMCN) was synthesized and characterizations of CMCN with different ratio of functional groups were studied. Ratios of functional groups on each repeating units of CMCN have great importance in the decision of CMCN properties using as an amphipathic coating basic film-forming material and ratios of functional groups were the most concerned of the study. Ratios of functional groups on each repeating units of CMCN were measured by elemental analyzer and calculated. Series of experiments were conducted using different ratios of functional groups of CMCN. Thermal properties of CMCN were measured by FT-IR and TG. Densities of CMCN powders were measured. Aqueous coatings based on CMCN/alkyd (after chemical modified by coconut oil) were prepared and morphology & rheology of CMCN hydrophilic dispersions were measured using an Anton-Paar-Strasse 20A-8054 Graz analyzer. Contact angles between films based on CMCN and deionized water were recorded. Other properties of films were measured. CMCN with the etherification of carboxymethyl groups at 0.35-0.40, nitrate ester groups at 1.96-2.19 and hydroxyl groups at 0.46-0.64 per d-glucose was considered as the best film forming material. © 2015 Elsevier Ltd. All rights reserved.


Zhang Y.,Beijing Institute of Technology | Shao Z.,Beijing Institute of Technology | Gao K.,Beijing Institute of Technology | Li J.,Beijing Institute of Technology | And 4 more authors.
Cellulose | Year: 2014

By non-solvent-induced phase separation, nitrate glycerol ether cellulose (NGEC) gels were formed in ternary NGEC/acetone/ethanol system. The rheological behaviors of NGEC gels were investigated using dynamic rheological measurements. The final compositions and morphologies of NGEC gels were influenced by the initial solvent/non-solvent (acetone/ethanol) ratios and NGEC concentrations. In addition, the effect of initial acetone/ethanol ratios on the characteristics of NGEC gels is different from the effect of NGEC concentrations. The critical strain of NGEC gels decreased almost with increasing NGEC concentration of gels by increasing initial acetone ratio, but it increased with increasing NGEC concentration of gels by increasing NGEC concentration beyond a certain concentration in 2/3 (w/w) acetone/ethanol solution. For all gels, the storage modulus (G′) and loss modulus (G′′) of NGEC gels rapidly increased with increasing NGEC concentration of gels. In addition, the curves for G′ and G′′ were temperature sensitive throughout the entire temperature sweep, which implied that the interactions between NGEC/solvent could be disrupted upon heating to higher temperatures. © 2014, Springer Science+Business Media Dordrecht.


Zhang Y.,Beijing Institute of Technology | Shao Z.,Beijing Institute of Technology | Shao Z.,North Century Cellulose Technology Research and Development. Co. | Li J.,Beijing Institute of Technology | And 2 more authors.
Journal of Applied Polymer Science | Year: 2015

Nitrate glycerol ether cellulose (NGEC) alcogels are formed in the ternary NGEC/acetone/ethanol system. NGEC aerogels are prepared from NGEC alcogels after solvent exchange and drying under supercritical CO2 (scCO2). The aerogels are prepared with various densities and porosities, relating directly to the initial ethanol content. NGEC aerogels had surface areas of up to 183 m2 g-1 and large mesopore volumes with a combination of large macropore volumes and a wide range of mesopore sizes. The aerogels with larger pore size distribution range, average pore diameter, and mesopore and macropore volume were obtained from system with higher ethanol content. The aerogels were further characterized by X-ray diffraction, Brunauer-Emmett-Teller analysis, electron microscopy, and thermogravimetric analysis. The results showed that the NGEC aerogels clearly retained the crystalline structure from NGEC. Compared with NGEC powders, the thermal decomposition of NGEC aerogel is accelerated and this process becomes more acute. © 2014 Wiley Periodicals, Inc.

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