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Zhou D.F.,China Institute of Technology | Wu Y.J.,China Institute of Technology | Guo J.B.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Lu F.H.,China Institute of Technology
Advanced Materials Research | Year: 2014

In this paper, generation and harm of SO2 are described. Cansolv SO2 Scrubbing, a regenerated amine process, is mainly described with respects to its process principle, features and application. This paper analyzed the existing problems such as corrosion, crystallization and loss of amine. Prevention measures were proposed according to the monitoring data, analysis and research. © (2014) Trans Tech Publications, Switzerland.


Guo J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | He M.,Guizhou Kumkuat Materials CO. | Li Q.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Yu J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Qin S.,National Engineering Research Center for Compounding and Modification of Polymer Materials
Journal of Applied Polymer Science | Year: 2013

Nanocomposite of thermoplastic elastomer ethylene-octene copolymer/maleated ethylene-octene (POE/POE-g-MAH) with organo-montmorillonite (OMMT, 11 wt %) as masterbatch have been obtained by melt blending and it has been characterized by transmission electron microscopy (TEM). Flame retardant POE/POE-g-MAH/OMMT/ ammonium polyphosphate-pentaerythritol (APP-PER) (an intumescent flame retardant with 75 wt % ammonium polyphosphate and 25 wt % pentaerythritol) composites were prepared by using melting processing to study their structures, flame-retardancy, thermal, and mechanical properties. TEM showed exfoliated structures throughout POE/POE-g-MAH/OMMT masterbatch and POE/POE-g-MAH/OMMT/APP- PER nanocomposites. Synergistic effect was observed between OMMT and APP-PER resulting in significant improvements on thermal stability, flame-retardancy and mechanical properties in the POE/POE-g-MAH/OMMT/APP-PER nanocomposites. © 2013 Wiley Periodicals, Inc.


Wang L.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Yang X.,Guizhou University | Zhang J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Zhang C.,National Engineering Research Center for Compounding and Modification of Polymer Materials | He L.,National Engineering Research Center for Compounding and Modification of Polymer Materials
Composites Part B: Engineering | Year: 2014

Expandable microspheres/epoxy foams with different densities and microstructures were prepared by changing the foaming temperature and the precuring extent. The microstructure of foams reveals a homogeneous distribution of cells at high precuring extent and high foaming temperature, while small cells size at high precuring extent and low foaming temperature. Furthermore, the compressive properties of epoxy foams were investigated. The compressive strength and modulus of the foam exhibited a power-law dependence with respect to density. By optimizing the foaming temperature and the precuring extent, epoxy foams with homogeneous cells and stable compressive property can be obtained. Fracture surface showed that deformed microspheres and less debris were observed at relatively high-density foams. © 2013 Elsevier Ltd. All rights reserved.


Shao H.-J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Wu B.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Guo J.-B.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Qin S.-H.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Lu S.-J.,Guizhou University
Polymer Composites | Year: 2014

To improve the properties of polyamide 6 (PA6) composites, a series of modified PA6 composites was prepared by reaction extrusion. An amorphous PA6 was first obtained by the complexing reaction of Li+ in lithium chloride with amino groups, and then epoxy resins, nano-SiO2 as well as POE-g-MAH were in turn added into the PA6/LiCl system. The effect of different additives on the crystallization behavior and mechanical properties of PA6 composites was well-studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), and mechanical properties tests. The results demonstrated that PA6 was amorphous at 6 phr lithium chloride and a network structure was formed in PA6 matrix in the presence of epoxy resins, thus the mechanical properties of composites greatly were enhanced. However too many nano-SiO2 particles might impair the tensile strength of PA6 composites. Additionally, a PA6 composite with excellent properties was obtained in the presence of POE-g-MAH due to the crystal form change in PA6 matrix and the strong interaction between PA6 and POE-g-MAH. © 2013 Society of Plastics Engineers.


Chen X.,Southwest Jiaotong University | Chen X.,University of Sichuan | Yu J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Zhang Z.,Southwest Jiaotong University | Lu C.,University of Sichuan
Carbohydrate Polymers | Year: 2011

Cellulose fibers were extracted from the rice straw by a mechanical-high pressure steam technique. The structure, chemical composition and thermal properties of cellulose fibers were investigated by using Fourier transform infrared (FTIR) spectroscopy, wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). FTIR analysis and chemical composition of fibers demonstrate that this mechanical-high pressure steam treatment can result in partial removal of hemicellulose and lignin from the structure of fibers. WAXD results reveal that this results in improved crystallinity of the fibers. The rice straw fibers are determined to have diameters in the range of 5-10 μm. After mechanical-high pressure steam treatments, the thermal properties of the rice straw fibers from the TGA results are found to increase dramatically after treatments. The degradation temperature of the rice straw fibers reaches over 280 °C, which is reasonably promising for the use of these fibers in reinforced-polymer composites. © 2011 Elsevier Ltd. All rights reserved.


Wang L.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Zhang J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Yang X.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Zhang C.,National Engineering Research Center for Compounding and Modification of Polymer Materials | And 2 more authors.
Materials and Design | Year: 2014

Epoxy syntactic foams containing 15. wt.% hollow glass microballoon were reinforced by fiberglass mesh and/or short glass fiber, and the flexural behavior of these foams were investigated. Flexural tests results showed that the presence of glass fiber or fiberglass mesh led to increased values of strength and modulus in syntactic foams compared with unreinforced syntactic foams. And fiberglass mesh was found to be much more efficient. By adding two-layer fiberglass mesh to the glass fiber reinforced syntactic foams, the flexural strength and modulus further increased almost 2.5 and 2. times, respectively, while the density of the reinforced foam only increased by 9.3%. In addition, it was found that the position and layers of fiberglass mesh had significant influence of the flexural properties. The failure modes and mechanisms of different reinforced syntactic foams are examined and the underlying differences are discussed. © 2013 Elsevier Ltd.


Shao H.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Qin S.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Yu J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Guo J.,National Engineering Research Center for Compounding and Modification of Polymer Materials
Polymer - Plastics Technology and Engineering | Year: 2012

Poly(ethylene-1-octene) (POE) was functionalized to varying degrees with glycidyl methacrylate (GMA) by melt grafting processes. Fourier transform infrared spectra (FT-IR) and 1H NMR spectra confirmed that glycidyl methacrylate was successfully grafted onto the POE. The data from GPC measure demonstrated that POE chains degraded during grafting process. The POE-g-GMA elastomers were used to toughen nylon. The mechanical properties, fracture surface morphology and the dispersal phase size were investigated. Results showed that the grafting degree strongly influenced the morphology, mechanical properties and the dispersal phase size of PA6/POE-g-GMA blends. © 2012 Copyright Taylor and Francis Group, LLC.


Cheng Q.,Tianjin Polytechnic University | Cui Z.,Tianjin Polytechnic University | Li J.,Tianjin Polytechnic University | Qin S.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Yan F.,Tianjin Polytechnic University
Journal of Power Sources | Year: 2014

Poly(vinylidene fluoride)/polysulfone (PVDF/PSF) blend microporous matrix of polymer electrolyte for lithium ion battery is prepared via thermally induced phase separation (TIPS) technique. Because of only one parameter, i.e., the PSF/PVDF weight ratio, the membrane microstructure is conveniently controlled. The membrane formation mechanism of PVDF/PSF blend membranes is proposed with the assistance of a binary PSF/PVDF weight ratio-temperature phase diagram. In addition to studying the microstructure and mechanical properties of PVDF/PSF blend membrane, the relationship between properties of membrane, electrochemical performances of corresponding polymer electrolyte and membrane microstructure are also discussed in this paper. It is found that the addition of PSF not only increases ionic conductivity and electrochemical stable window of polymer electrolyte, but also markedly enhances charge-discharge performances of coin cell. The results reveal that PVDF/PSF blend microporous membranes prepared via TIPS technique can be used as polymer matrices of polymer electrolytes for lithium ion batteries. © 2014 Elsevier B.V. All rights reserved.


Chen X.,Southwest Jiaotong University | Yu J.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Luo Z.,National Engineering Research Center for Compounding and Modification of Polymer Materials | Guo S.,University of Sichuan | And 2 more authors.
Polymers for Advanced Technologies | Year: 2011

In this work, elastomer-toughened polypropylene (PP)/magnesium hydroxide (MH) composites with ethylene-octene copolymer (POE) were prepared in a twin-screw extruder and then injection-molded. The structure, mechanical properties, phase morphology, and rheological behaviors of PP/POE/MH ternary composites were studied. The mechanical properties and fracture behaviors of PP/POE/MH ternary composites are strongly influenced by the incorporation of POE copolymer. The addition of POE causes a significant improvement in the impact strength of the composites, from 3.6kJ/m2 in untoughened composites to 47.4kJ/m2 in PP composites containing 30phr POE. This indicates that POE is very effective in converting brittle PP composites into tough composites. Conversely, the tensile strength and the Young's modulus of the composites decrease with respect to the PP composites, as the weight fraction of POE is increased to 40phr. Scanning electron microscopy (SEM) study shows a two-phase morphology where POE, as droplets, is dispersed finely and uniformly in the PP matrix. The rheological behaviors show that the interfacial interaction in the composites is enhanced with increase in POE content. Interparticle interactions give rise to the formation of interparticle network. © 2009 John Wiley & Sons, Ltd.


Ma T.,Tianjin Polytechnic University | Cui Z.,Tianjin Polytechnic University | Wu Y.,Tianjin Polytechnic University | Qin S.,National Engineering Research Center for Compounding and Modification of Polymer Materials | And 4 more authors.
Journal of Membrane Science | Year: 2013

PVDF/PMMA blend microporous membranes were fabricated via thermally induced phase separation (TIPS) process using a single diluent. Then the blend membranes were soaked in a liquid electrolyte to form polymer electrolytes. Finally, the polymer electrolytes were assembled in coin cells to test electrochemical properties. The effects of PMMA/PVDF weight ratio on the phase diagram of PVDF/PMMA/diluent system, morphology, crystallinity, crystal structure, mechanical properties and porosity of the membranes were discussed. The electrochemical properties of corresponding polymer electrolytes, such as ionic conductivity, cell charge-discharge capacity and discharge performance at different current densities, electrochemical stability windows, were also investigated in this paper. It was found that the cloud point of the system decreased and the membrane morphology changed from cellular structure to network structure with an increase in the amount of PMMA. Both electrolyte uptake of blend membranes and ionic conductivity of corresponding polymer electrolytes also increased with an increase in the amount of PMMA. The maximum ionic conductivity was found to reach 3.38×10-3S/cm at 25°C. The graphite/polymer electrolyte/LiFePO4 cells of blend membranes showed higher charge-discharge capacity and better discharge performance at different current densities. Electrochemical stability window was stable up to 4.7V (vs. Li+/Li). © 2013.

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