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Wang B.,CAS Guangzhou Institute of Energy Conversion | Wang B.,University of Chinese Academy of Sciences | Yang D.,CAS Guangzhou Institute of Energy Conversion | Yang D.,Chinese Academy of Sciences | And 10 more authors.
Polymers | Year: 2016

Bacterial cellulose (BC) has great potential to be used as a new filler to reinforce isotactic polypropylene (iPP) due to its high crystallinity, biodegradability, and efficient mechanical properties. In this study, esterification was used to modify BC, which improved the surface compatibility of the iPP and BC. The results indicated that the cellulose octoate (CO) changed the surface properties from hydrophilic to lipophilic. Compared to the pure iPP, the tensile strength, charpy notched impact strength, and tensile modulus of the iPP/BC composites increased by 9.9%, 7.77%, and 15.64%, respectively. However, the addition of CO reinforced the iPP/CO composites. The tensile strength, charpy notched impact strength, and tensile modulus of the iPP/CO composites increased by 14.23%, 14.08%, and 17.82% compared to the pure iPP. However, the elongation at break of both the composites is decreased. The SEM photographs and particle size distribution of the composites showed improvements when the change of polarity of the BC surface, interface compatibility, and dispersion of iPP improved. © 2016 by the authors. Source

Deng Y.-H.,South China University of Technology | Wang T.,South China University of Technology | Qian Y.,South China University of Technology | Lou H.-M.,South China University of Technology | Guo Y.-Q.,Guangzhou Fibre Product Testing and Research Institute
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2016

Adsorption behavior and dispersion performance of lignin-type GCL1-JB and SL were investigated. The adsorption behavior of GCL1-JB and SL was studied by self-assembly technology and monitored by QCM-D technology. Adsorption capacity, adsorption film thickness and adsorption layer structure of GCL1-JB and SL on a solid substrate were compared. The experimental results show that GCL1-JB has higher adsorption capacity, thicker adsorption film, more compact adsorption layer, smoother film surface and higher zeta potential on the surface of cement particles. The steric and electrostatic repulsion among GCL1-JB particles are stronger than that of SL, which results in better dispersion performance of GCL1-JB than that of SL. This study shows importance in understanding dispersion behavior of lignin-based water reducing agents. © 2016, Editorial Board of “Journal of Chemical Engineering of Chinese Universities”. All right reserved. Source

Wang Q.,Donghua University | Bai Y.,Donghua University | Xie J.,Guangzhou Fibre Product Testing and Research Institute | Jiang Q.,Donghua University | And 3 more authors.
Powder Technology | Year: 2016

In this work, hot gas filters composed of polyimide nanofiber membrane sandwiched between carbon woven fabrics are fabricated to capture fine particles of PM 2.5 level. Polyimide (PI) nanofibers with an average diameter of 190nm are electrospun on supporting carbon fabrics as filtration layers. The filtration performance tests show that the maximum filtration efficiency reaches 99.99% for PM 2.5, while the maximum pressure drop is only 251.86Pa after continuously testing for 25min under a constant flow rate of 20L/min. As the areal density of the PI nanofiber membrane increases, the filtration efficiency increases first and then levels off when the areal density reaches 11.64g/m2. In regeneration performance test with back air flush at a pressure of 500KPa, the composite filter maintains a filtration efficiency of 99.99% and a pressure drop of about 410Pa. After heat treatment at 260 and 300°C, the composite filter shows a relatively high filtration efficiency while the tensile strength of the carbon fabric does not change significantly. © 2016 Elsevier B.V. Source

Xie J.F.,Guangzhou Fibre Product Testing and Research Institute
Advanced Materials Research | Year: 2014

Electrospun membrane filters used to remove particles from hot gases were highly desired to meet the requirement of application in high temperature. Polyimide is a kind of high performance polymer, especially for excellent thermal stability and chemical resistance. In this paper, the polyimide precursor poly(amic acid) (PAA) was synthesized from 3,3’,4,4’-oxydiphthalic anhydride (ODPA) and 4,4’-methylenedianiline (MDA), the polyimide (PI) ultrathin fiber membrane was fabricated by electrospinning and followed by thermal imidization. Scanning electron microscope (SEM), infrared spectrometry (IR), and thermogravimetric analysis (TGA) were used for the characterizations of the polyimide ultrathin fiber Membrane, the tests show that the diameter of ultrathin fiber is uniform with an average size of around 400nm and the membrane is thermally stable at a high temperature of 500℃. © (2014) Trans Tech Publications, Switzerland. Source

Wang Q.N.,Key Laboratory of Textile Science and Technology | Bai Y.Y.,Key Laboratory of Textile Science and Technology | Xie J.F.,Guangzhou Fibre Product Testing and Research Institute | Qiu Y.P.,Key Laboratory of Textile Science and Technology | And 5 more authors.
Materials Science Forum | Year: 2015

Increasing air pollution caused mainly by exhaust emission has become a serious concern for public health. In order to efficiently control the exhaust emission from the origin, hot gas filtration is required in many industries, such as thermal power regeneration, metal refining/recycling, and biomass/coal gasification. This study aimed to develop a hybrid filter composed with ultrafine fibrous polyimide (PI) filtration layers and carbon woven fabric supporting layers for hot gas filtration. Uniform PI ultrafine fibers around 200 nm with small pores about 2.2 μm were electrospun on carbon fabrics supporting layers to serve as the filtration layer. During filtration test, NaCl aerosols (0.3 mm), which mimicked PM 2.5 particles were accumulated on the top of filtration layer and formed dust cake, but limited aerosols were observed on the carbon fabric supporting layers. It was proved that PI fiber mats played the key role in filtration. The filtration efficiency could be maintained above 95% after 9 min and reached 99.4%. This research proved that the multi-scale polyimide/carbon fibers hybrid filters possessed the potential to serve as filtration media in bag filters for hot gas filtration. © (2015) Trans Tech Publications, Switzerland. Source

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