Rong Guan
Hubei University
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Publication
Featured researches published by Rong Guan.
Journal of Macromolecular Science, Part A | 2008
Hongzhi Huang; Deping Lu; Ling Shen; Rong Guan
The emulsion copolymerization of methyl methacrylate and octyl acrylate was studied using a reactive surfactant ammonium sulfate allyloxy nonylphenoxy poly(ethyleneoxy) (10) ether (DNS‐86), and a conventional surfactant sodium dodecylbenzene sulfonate (DBS) with a similar structure as a comparison sample. A series of latex samples have been prepared with two kinds of surfactants, and their properties have been characterized and compared. 1H‐NMR proves that the reactive surfactant has been incorporated into the resulting copolymers. The atomic force microscopy (AFM) proves that the reactive surfactant DNS‐86 migrate to the surface of the latex film to a much less degree than the conventional surfactant DBS. Transmission electron microscopy (TEM) demonstrates that there are some differences in the particle morphologies. The stability and water‐resistance of the latex films prepared by reactive surfactant DNS‐86 are better than those prepared by the conventional surfactant DBS.
Journal of Applied Polymer Science | 2000
Rong Guan
The structure and morphology of isotactic polypropylene (iPP), functionalized by electron beam irradiation at room temperature in air, are investigated by elementary analysis, FT-infrared (FTIR) spectroscopy, electron spectroscopy for chemical analysis (ESCA), polariscope, and static contact angle. Elementary analysis reveals that the element oxygen has been introduced onto iPP chains after electron beam irradiation. In addition, as shown from FTIR spectra, oxygen-containing groups, such as carbonyl, carboxyl, and ether groups, are introduced onto iPP molecular chains. The dependence of oxygenation extent (as measured by O1S/C1S value of ESCA spectra) on electron beam dose is obtained. Under polariscope, it can be observed that the dominant alpha phase appears to become more enhanced, and there is no crystalline phase transition. The static contact angle of iPP decreases with increasing dose.
Polymer-plastics Technology and Engineering | 2007
Fen Xiong; Rong Guan; Zhaoxin Xiao; Banglong Xiang; Deping Lu
In this article, the effects of the β-nucleators WBG and WOT on the crystallization behavior and morphology of isotactic polypropylene (iPP) were investigated using a combination of differential scanning calorimetry (DSC), wide-angle X-ray (WAXD), polarized optical microscopy (POM) and atomic force microscopy (AFM). The results showed that the amount of β-form and the spherulite size decreased with increasing WBG contents. At about 0.15 wt. % WBG nucleator, the formation of the β-form was evidently observed. Whereas, for the iPP with low content of WOT nucleator, the formation of the β-form was almost the same as that of pure iPP.
Journal of Adhesion Science and Technology | 2015
Shufang Jiang; Shangwen Zha; Lanjun Xia; Rong Guan
A series of diphenylsilanediol modified epoxy resins and novel curing agents were synthesized. The modified epoxy resins were cured with regular curing agent diethylenetriamine (DETA); the curing agents were applied to cure unmodified diglycidyl ether of bisphenol A epoxy resin (DGEBA). The heat resistance, mechanical property, and toughness of all the curing products were investigated. The results showed that the application of modified resin and newly synthesized curing agents leads to curing products with lower thermal decomposition rate and only slightly decreased glass transition temperature (Tg), as well as improved tensile modulus and tensile strength. In particular, products cured with newly synthesized curing agents showed higher corresponding temperature to the maximum thermal decomposition rate, comparing with products of DGEBA cured by DETA. Scanning electron microscopy micro images proved that a ductile fracture happened on the cross sections of curing products obtained from modified epoxy resins and newly synthesized curing agents, indicating an effective toughening effect of silicon–oxygen bond.
Journal of Adhesion Science and Technology | 2014
Lanjun Xia; Lu Zuo; Xiaoli Wang; Deping Lu; Rong Guan
A curing agent Thiourea-diethylenetriamine (TU-DETA) was successfully prepared with its structure characterized by Fourier transform infrared spectrum and nuclear magnetic resonance (13C-NMR spectrum). The curing agent TU-DETA contained incompletely reacted material diethylenetriamine (DETA) and the polymerization degree (n) of TU-DETA was equaled to either 1 or 3 according to liquid chromatography–mass spectrometry (LC-MS) analysis. Kinetics of thermal degradation of DGEBA (diglycidyl ether of bisphenol A)/TU-DETA epoxy system was investigated with thermogravimetric analysis (TGA) under non-isothermal conditions with heating rates of 5, 10, 12.5, 15, and 20 °C/min. The derivative thermogravimetry curves of DGEBA/TU-DETA epoxy system revealed that the thermal degradation process was only a single weight-loss step. The apparent average activation energy calculated with the Flynn–Wall–Ozawa method was 140.4 kJ/mol. With a combination of the Coats–Redfern and Phadnis–Deshpande methods, it was showed that the most probable mechanism of degradation process of the cured epoxy resin was F1 deceleration type.
Polymer-plastics Technology and Engineering | 2012
Rong Guan; Hao Chen; Jingzuo Zhao; Shufang Jiang; Zhao Ke; Shangwen Zha
The mechanical properties of the novel plasticized microcellular PC thin sheets using tributyl citrate as plasticizer and prepared by compression molding have been investigated. The tensile testes showed that the foaming temperature and the TBC content had pronounced effects on the tensile modulus and strength, the stress-strain curves of foamed plasticized PC were very different from that of unfoamed PC and the characterizations of the stress-strain curves of foamed plasticized PC strongly depended on the relative density. Besides, the relative tensile modulus and strength were also investigated as functions of the relative density and several empirical functions have been established.
Journal of Wuhan University of Technology-materials Science Edition | 2013
Hao Chen; Rong Guan; Jingzuo Zhao; Shufang Jiang; Zhao Ke; Shangwen Zha
Novel microcellular foams using thin plasticized PC sheet were prepared by compression molding. The measurement results showed that Tg of plasticized PC was decreased and the molecular chain mobility was increased. Decrease in Tg and increase in chains mobility were contributed to the widen of foaming temperature window. Effects of processing conditions on cell size, cell density and relative density were also investigated. The experimental results show that the temperature, tributyl citrate and foaming agent content have more effects on the structures and morphology of the plasticized PC microcellular foam. Effects of experimental conditions on cell size distribution have also been discussed.
Journal of Wuhan University of Technology-materials Science Edition | 2012
Deping Lu; Hongzhi Huang; Ling Shen; Jin Xie; Rong Guan
Stable high-solids-content acrylate emulsion were obtained with a nonionic polymerizable emulsifier allyloxy nonylphenoxy poly (ethyleneoxy) (10) ether (ANPEO10), and a conventional emulsifier OP-10 as a reference sample. 1H NMR proves that the polymerizable emulsifier ANPEO10 has been incorporated into the resulted acrylate polymers. TEM demonstrates that there are some differences in the particle morphologies. AFM proves that the polymerizable emulsifier ANPEO10 migrating to the surface of the emulsion film was much less than the conventional emulsifier OP-10. The polymerizable emulsifier ANPEO10 can enhance the adhesion with glass plate compared to the conventional emulsifier. Furthermore, with increasing amount of emulsifier, the surface free energy of the films first decreased and then increased, and the adhesion with glass plate is initially enhanced and then attenuated. The water-resistance and solvent-resistance of the films prepared by the polymerizable emulsifier ANPEO10 are superior to those prepared by the conventional emulsifier OP-10.
Polymer Science Series A | 2009
Zhaoxin Xiao; Yinglin Li; Juan Liu; Deping Lu; Shifang Yang; Rong Guan
Microcellular thin polycarbonate sheets have been prepared by compression molding with the cell size in the range of 2∼20 microns, and cell density larger than 108 cells/cm3. The effect of processing parameters on the microcellular polycarbonate structure has been investigated. The cell size decreases with increasing foaming time till 8 minute and then increases. Besides this parameter slightly decreases with increasing foaming pressure, but increases with increasing temperature. The variation of cell density is contrary to that of cell size, and the foam density decreases with increasing foaming pressure and foaming temperature and displays a variable trend with increasing foaming time under different foaming pressures.
Polymer-plastics Technology and Engineering | 2008
Yinglin Li; Rong Guan; Banglong Xiang; Zhaoxin Xiao; Yajing Jiang; Deping Lu
This article presented processing-mechanical property relationship of thin microcellular poly(ethylene terephthlate) (PET) sheet prepared by compression molding. The results showed that the saturation time and the lower-plate temperature had more effects on the mechanical property. The upper-plate temperature and the PET thickness also had some effects on the mechanical property. The upper-plate temperature had more pronounced effect on the specific tensile strength than on any other mechanical parameters. Besides, there was little dependence of the mechanical property on the saturation pressure and the blowing agent content.