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Ouyang C.,Kingfa Science and Technology Co. | Luo J.,SGS CSTC Standards Technical Services Company Ltd | Wang Y.,Nankai University | Zhang Z.,Nankai University
Lizi Jiaohuan Yu Xifu/Ion Exchange and Adsorption | Year: 2012

The composites between poly(lactic acid) (PLA) and Modified Multiwalled Carbon Nanotubes (MWCNTs) were prepared by solution mixing with CHCl 3. The acidification and esterification of MWCNTs were confirmed by Raman spectroscopy and thermogravimetric (TG) analysis, respectively. Scanning electron microscopy (SEM) results demonstrated the compatibility of the composites. With increasing the content of the modified MWCNTs in the composites, the dispersion of the system became well, and the compatibility was also improved. The further experimental results showed that the mechanical properties of the composites were improved because of good dispersity of modified MWCNTs in the PLA matrix, and the tensile strength reached up to 120.4MPa when the content of the modified MWCNTs was added to 1.5%. Source

Gao H.,Nankai University | Gao H.,Kingfa Science and Technology Co. | Cheng T.,Nankai University | Liu J.,Peking Union Medical College | And 5 more authors.
Biomacromolecules | Year: 2014

Exploring ideal nanocarriers for drug delivery systems has encountered unavoidable hurdles, especially the conflict between enhanced cellular uptake and prolonged blood circulation, which have determined the final efficacy of cancer therapy. Here, based on controlled self-assembly, surface structure variation in response to external environment was constructed toward overcoming the conflict. A novel micelle with mixed shell of hydrophilic poly(ethylene glycol) PEG and pH responsive hydrophobic poly(β-amino ester) (PAE) was designed through the self-assembly of diblock amphiphilic copolymers. To avoid the accelerated clearance from blood circulation caused by the surface exposed targeting group c(RGDfK), here c(RGDfK) was conjugated to the hydrophobic PAE and hidden in the shell of PEG at pH 7.4. At tumor pH, charge conversion occurred, and c(RGDfK) stretched out of the shell, leading to facilitated cellular internalization according to the HepG2 cell uptake experiments. Meanwhile, the heterogeneous surface structure endowed the micelle with prolonged blood circulation. With the self-regulated multifunctional collaborated properties of enhanced cellular uptake and prolonged blood circulation, successful inhibition of tumor growth was achieved from the demonstration in a tumor-bearing mice model. This novel nanocarrier could be a promising candidate in future clinical experiments. © 2014 American Chemical Society. Source

Jiang H.,Southwest Jiaotong University | Cheng Q.,Southwest Jiaotong University | Jiang C.,Southwest Jiaotong University | Zhang J.,Southwest Jiaotong University | Yonghua L.,Kingfa Science and Technology Co.
Tribology International | Year: 2015

For the scratch process of polypropylene (PP), the stick-slip phenomenon always exists and contributes to the observed periodic surface damage patterns. The stick-slip, one main cause for scratch visibility, alters the surface characteristics of substrate and eventually induces scratch visibility. Both ASTM/ISO and Erichsen scratch test methods are employed to study the stick-slip phenomenon and its effects on scratch behavior of PP. Image analysis shows that the stick-slip phenomenon was responsible for material removal and severe surface damage. Possible solutions to improve the scratch performance of polymeric materials are also discussed in this paper. © 2015 Elsevier Ltd. All rights reserved. Source

Huang X.,Shanghai JiaoTong University | Wei W.,Shanghai JiaoTong University | Wei H.,Shanghai JiaoTong University | Li Y.,Kingfa Science and Technology Co. | And 2 more authors.
Journal of Applied Polymer Science | Year: 2013

An amine-terminated curing agent for epoxy resin based on hexachlorocyclotriphosphazene was synthesized. Its chemical structure was characterized by1H-NMR, FT-IR, and elemental analysis. The curing temperature was determined by differential scanning calorimeter. The thermal stability, hydrophobicity, flame retardancy, and insulation property of the epoxy resin cured by the as-prepared curing agent were superior to those of the epoxy resin cured by 4,4-diaminodiphenylsulfone. The epoxy resin cured by the new curing agent obtained the best heat-moisture resistance when the ratio of amino protons and epoxy group was 1.2: 1. The temperature reached 318 and 376°C when the weight loss was 5 and 10% meanwhile the residue at 800°C was above 64%. The material achieved UL94 V-0 rating and the water absorption was only 0.57%. The electric insulation property was also improved especially when it was compared in wet conditions at water absorption saturation. © 2013 Wiley Periodicals, Inc. Source

He J.-H.,South China University of Technology | He J.-H.,Kingfa Science and Technology Co. | Zhao J.-Q.,South China University of Technology
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2010

By the methods of limited oxygen index (LOI), cone calorimeter, Fourier transform infrared spectroscopic(FT-IR), scanning electron microscope (SEM) and wide angle X-ray diffraction (WAXD), the synergistic flame-retarding property and mechanism of a silicon-containing flame retardant (SFR-H) and ammonium phosphate/melamine cyanurate (APP/MCA) intumescent flame-retardant system were studied. The results imply that SFR-H/APP/MCA synergistic flame-retarding system obviously improves the LOI value and decreases heat release rate of linear low density polyethylene (LLDPE) during combustion. SFR-H exhibits good synergistic flame-retarding effect with APP/MCA intumescent flame-retardant system. They degraded to generate ceramic compounds containing silicon, boron and phosphorus elements during combustion, which improves the flame-retarding effect by reinforcing the thermo-oxidative stability, mechanical property and insulating effect of continuous intumescent charred layer. Source

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