Polymers
·
2018
·Vol. 10
·期 9
·1024
·
IF 2.935
Qiyun Luo,Yuqi Li,Li Ren,Xu Xu,Shaorong Lu
Well-defined functionalized sisal cellulose fibers (SCFs) grafted on hyperbranched liquid crystals (HLP) were synthesized to improve the compatibility between SCFs and epoxy resin (EP). The influence of SCFs-HLP on the mechanical and thermal properties of SCFs-HLP/EP composites was studied. The results show that the mechanical properties of SCFs-HLP/EP composites were enhanced distinctly. Particularly, compared with EP, impact strength, tensile strength, and flexural strength of composites with 4.0 wt % SCFs-HLP were 38.3 KJ·m−2, 86.2 MPa, and 150.7 MPa, increasing by 118.7%, 55.6%, and 89.6%, respectively. As well, the glass transition temperature of the composite material increased by 25 °C. It is hope that this work will inform ongoing efforts to exploit more efficient methods to overcome the poor natural fiber/polymer adhesion in the interface region.Keywords:sisal cellulose fibers;epoxy resin;composites;liquid crystals;hyperbranched
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 7
·4133-4144
·
IF 3.809
Geng Aobo,Meng Liang,Han Jingquan,Zhong Qiang,Li Meirun,Han Shuguang,Mei Changtong,Xu Lijie,Tan Lin,Gan Lu
Abstract There is an urgent need to explore alternatives to replace traditional carbonaceous materials because of dwindling oil reserves and increasing atomospheric carbon dioxide. In the present study, the cellulose derived carbon nanofibers (CCNF) were prepared and used to hybridize with bismuth oxybromide to prepare novel photocatalyst composites (CCNF/BiOBr). The structural properties of the prepared composites were then characterized. Afterwards, the photocatalytic performance of the CCNF/BiOBr composites was investigated through degrading rhodamine B (RhB) under continuous visible light irradiation. The results indicated that the pyrolysis process could convert the cellulose to carbon nanofiber with high graphitization degree. The photocatalytic performance of the CCNF/BiOBr composite was better than that of the pure BiOBr, which was ascribed to the introduction of the CCNF into the composite system. The present work provides a promising way to design new photocatalyst composites with desirable carbon alternatives from biomass materials for effective treatment of organic contaminants in water media. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 2
·340-349
·
IF 1.353
Wang Yixi,Wang Hao,Peng Huili,Wang Zhicun,Wu Jianning,Liu Zhiyong
A novel eco-friendly porous adsorbent of cellulose (CE)/chitosan (CS) aerogel was prepared through sol-gel process and freeze-drying to remove Congo Red (CR). A series of aerogels were prepared by adjusting the mass ratios of CE and CS. Composite aerogels were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray diffraction (XRD). SEM images showed that it was possible to change the structure of the aerogel by adjusting the amount of chitosan. The effects of dosage of chitosan, initial pH, temperature, adsorbent dosage, contact time, and initial dye concentration on adsorption capacities for CR were studied in detail. Batch adsorption studies showed that aerogel exhibited maximum removal efficiency to CR at a composite ratio of 1:3 and dosage of 2.5 g/ l . CE/CS aerogel had excellent adsorption capacities for CR at a pH range of 3-11, which indicated stability of the aerogel in both acidic and alkaline conditions. CR adsorption on the composite aerogel fitted pseudo-second-order kinetics and Langmuir isotherm. The Langmuir isotherm model revealed that the maximum theoretical adsorption capacity of this material for CR was 381.7 mg/g at pH 7.0 at 303 K for 24 h. The adsorption mechanism included electrostatic and chemical interactions. The results indicated that the adsorption capacity of CE/CS aerogels was higher than the other chitosan composites adsorbents.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Li Qu,Hailong Yu,Fengli Yu,Bing Yuan,Congxia Xie,Shitao Yu
A new and environmental friendly route has been developed to hydrogenate α-pinene to cis -pinane. The α-pinene was hydrogenated using ruthenium (Ru) nanoparticles that were stabilized by modified carboxymethyl cellulose in aqueous medium. The conversion of α-pinene reached 96.6% and the selectivity of cis -pinane was 98.4%. Ru nanoparticles could be recycled 18 times. Ru nanoparticles and micelles were characterized by transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), dynamic light scattering (DLS), X-ray diffraction (XRD), and other detection techniques. Ru nanoparticles (3.2 nm) had a good stability and uniform distribution, the reaction was divided into micelles that appeared to act as “microreactors”, and the micelle size was increased in the absence of sodium carbonate. The good stability of the Ru nanoparticles could be attributed to electrostatic and steric stabilization.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·10920-10932
·
IF 2.993
Qian Shaoping,Sheng Kuichuan,Yu Kai,Xu Linqiong,Fontanillo Lopez Cesar A.
Poly(lactic acid) (PLA) is a potential green alternative for conventional petroleum-based plastics. However, the brittleness limits its application (e.g., agricultural films, garbage bags, plastic bags, food containers, food packaging). In this study, silane-compatibilized (triethoxyvinylsilane, A-151) bamboo cellulose nanowhiskers (BCNW) were introduced into a PLA matrix to toughen the composites. The A-151 successfully grafted on the surface of cellulose, and the thermal degradation stability of BCNW decreased after A-151 modification. Morphological, tensile and thermal properties of the toughened PLA bionanocomposites were investigated, and the toughen mechanism was clarified. The silane linked BCNW and PLA via Si–O–C bonds and hydrogen bonds. Elongation at break of the composites remarkably increased from 12.3 ± 1.7% (untreated) to 213.8 ± 21.6% (16 wt% A-151 treated). Both tensile strength and modulus decreased with the silane treatment. Typical toughness fracture characteristic (wire-drawing) was observed on the fractural surface. Glass transition temperature and crystallinity decreased from 45.6 °C/30.33% (untreated) to 33.6 °C/13.23% (16 wt% A-151 treated).
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Wei Wang,Tao Liang,Baikai Zhang,Huiyu Bai,Piming Ma,Weifu Dong
Cellulose nanocrystals (CNC) were carboxylated through an organic solvent free esterification method using l -malic acid (MA) to improve performance of transparent poly(methyl methacrylate) (PMMA) nanocomposites. A series of CNC carboxylated with a degree-of-substitution (DS) of 0, 0.035, and 0.20 were obtained. The presence of grafted carboxyl groups was characterized by Fourier transform infrared (FT-IR) spectroscopy and 13 C NMR analysis, meanwhile effects of content and DS of CNC on the structure, thermal, mechanical, and optical transparency properties of the nanocomposites were assessed. The results indicated that the homogeneous dispersion of CNC and a favorable PMMA-CNC interface were necessary to enhance the properties of nanocomposites. Facilitated through hydrogen bonding interactions, the resulting films demonstrated that a low percentage loading of CNC with high DS worked as effective reinforcing agents, producing stronger and tougher films than neat PMMA films, with an improved thermal stability and retention of good transparency.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 46
·46824
·
IF 1.901
Yuyu Liu,Lingli Deng,Cen Zhang,Kailun Chen,Fengqin Feng,Hui Zhang
In this study, we fabricated ethyl cellulose (EC)–gelatin (G) composite films by solvent casting and electrospinning. The characterization of the cast and electrospun films was performed by scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectrometry, and water contact angle measurements. The results showed that the blending of EC with G improved the spinnability of the composite films with higher thermal stability. Compared with solvent casting, electrospinning induced a helix-to-coil transition of G and provided more hydrogen-forming sites for EC to form a compatible network. Interestingly, the electrospun composite film had a hydrophobic surface with a water contact angle of 113.8°, whereas the cast composite film showed a hydrophilic surface at 67.5°. The confocal laser scanning microscopy observations suggested that after water immersion, the cast composite film collapsed into aggregates, whereas the electrospun composite film maintained the nanofibrous structures well; this indicated an improved water resistance. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46824.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2018
·Vol. 12
·期 4
·387-391
·
IF 2.993
Si Junhui,Ye Jianhua,Chen Pengfei,Chen Song,Cui Zhixiang,Wang Qiangting
For the purpose to improve the capacity of biomimetic mineralization of thermoplastic polyurethane (TPU) nanofiber. A novel, straightforward, fast and versatile method was developed to modify the surface of TPU nanofiber with cellulose nanocrystal (CNC) particles for the improvement
of hydrophilic property. The TPU nanofiber was prepared by using electrospinning. And then the surface of TPU nanofiber was modified through simply immersing it into CNC dispersion and subjecting to ultrasonication. Finally, the TPU/CNF nanofiber was biomineralized by treatment in simulated
body fluid (SBF). The results showed that the biomimetic mineralized TPU/CNC-HA fibrous scaffold for bone regeneration was successfully fabricated and the introduction of CNC particles can effectively increase the deposition rate of biomimetic HA crystals on the surface of TPU nanofiber. The
fabricated TPU/CNC-HA fibrous scaffold contains a high quality mineralized coating and shows that its tensile strength and Young's module are significantly larger than these of TPU scaffold. Moreover, the scaffold can mimic the morphology and components of natural bone and provide a potential
application in bone regeneration.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xiao Wei,Ting Huang,Jun Nie,Jing-hui Yang,Xiao-dong Qi,Zuo-wan Zhou,Yong Wang
As one of the materials from natural resources, the functionalization and application of cellulose attract increasing concerns. In this work, we reported a facile method to prepare the bio-inspired functionalization of microcrystalline cellulose (MCC) aerogel through polydopamine (PDA) coating, which was realized via the self-polymerization of dopamine in the MCC/LiBr solution followed by the freeze-drying technology. The morphological characterization showed that the pore morphologies of the compounded aerogel were influenced by the content of PDA. Adsorption measurements toward methylene blue (MB) showed that the compounded aerogel had high adsorption ability. Moreover, the compounded MCC/PDA aerogel exhibited excellent adsorption selectivity and it exhibited high efficiency to remove MB from different solutions, such as the mixed solution with anionic dyestuffs, the mixed solution with cationic dyestuffs and the mixed solution with common salt (NaCl). The high adsorption ability and excellent adsorption selectivity endows the compounded MCC/PDA aerogel with great potential applications in wastewater treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Xiong-Fei Zhang,Yi Feng,Zhongguo Wang,Mingmin Jia,Jianfeng Yao
Incorporating metal-organic frameworks into cellulose matrix to prepare composite membranes is promising in gas-separation applications. In this study, UiO-66-NH 2 (Zr-based MOF) nanoparticles are wrapped into the densely packed cellulose nanofibrils (CNF-COOH) via a facile vacuum filtration process. The existence of acid-base interactions and electrostatic forces between UiO-66-NH 2 and CNF-COOH renders ideal interfacial morphology. Results show that UiO-66-NH 2 is cross-linked by -COOH groups and well-dispersed in the CNF matrix. The porous UiO-66-NH 2 strengthens the diffusion process of CO 2 molecules, thus elevating the permeation flux and separation factor simultaneously. The optimum separation performance is achieved over CM-1 membrane with a CO 2 permeability of 139 Barrer and a CO 2 /N 2 selectivity ratio of 46.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2018
·
IF 2.707
Wanghuan Guo,Fan Yang,Zhigang Zhao,Qiuxia Liao,Chunqing Cai,Yang Zhang,Ruixi Bai
To achieve an adsorbent that has better absorption and extraction performance, carboxymethyl-diethylammoniumethyl cellulose (CMDEAEC), a low-cost cellulose-based ionic liquid that possesses a nanoscale particle size and good swellability to increase the contact area, was prepared through a one-step reaction. The chemically modified cellulose was verified by Fourier transform infrared spectroscopy, elemental analysis and scanning electron microscopy. As an adsorbent, CMDEAEC was used for selective recovery of metal ions. The effects of pH, adsorbent dose, initial concentration, and contact time on metal ion adsorption were examined. CMDEAEC was found to exhibit selectivity only for Au(III). Additionally, the adsorption process follows the Langmuir isotherm model and the pseudo-second-order kinetics model. Furthermore, the desorption of ions from CMDEAEC and the regeneration capacity of CMDEAEC were investigated. In conclusion, as an efficient, low-cost, easily obtained and environmentally friendly adsorbent, CMDEAEC is expected to be used for the selective recovery of gold.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Junchen Liu,Kai Yang,Yudi Mo,Shuanjin Wang,Dongmei Han,Min Xiao,Yuezhong Meng
As a pivotal part of lithium-ion batteries, separator is supposed to have high strength , thermal stability and excellent wettability . In this study, polyformaldehyde/cellulose nanofibers blend separators are firstly prepared via thermally induced phase separation to improve the performance, especially the safety of LIBs. The polyformaldehyde/cellulose blend separators show considerable tensile strength (116 MPa) and Young's modulus (6.07 GPa) owing to the high crystallinity and high performance of polyformaldehyde and cellulose . In particular, benefiting from their abundant polar groups and highly porous structure , the polyformaldehyde/cellulose blend separators possess high electrolyte uptake (412%) and small contact angle (19°) as compare to the commercial polyethylene separator (115%, 58°). Moreover, the thermal treatment tests indicate that the polyformaldehyde/cellulose blend separators are thermally stable at as high temperature as 180 °C. And the polyformaldehyde/cellulose blend separators show higher ionic conductivity (1.39 mS cm −1 ) and lower interface resistance (49.5 Ω) than polyethylene separator (0.76 mS cm −1 , 136.4Ω). As expected, the LiFePO 4 /Li cell with polyformaldehyde-20-cellulose blend separators exhibit the best stable cycling performance and improved rate performance than PE separator, especially at high rate. In summary, the polyformaldehyde/cellulose blend separators are promising new kind of separator for LIBs with high safety and enhanced performance.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）