Table of Content

28 August 2013, Volume 0 Issue 5

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THE CHARACTERIZATION OF EPOXY VALUE BY INFRARED SPECTROSCOPY METHOD COMBINED WITH CHEMICAL ANALYSIS

MA Nan-nan, ZHAO Juan, CHEN Fu-hua

2013, 0(5):  3-6. 

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Two separation methods for bisphenol-A epoxy resin’s epoxy value were investigated: infrared spectroscopy method combined with chemical analysis. Through this paper,epoxy value was determined through chemical analysis,and epoxy index was analyzed by infrared spectroscopy. The relation of epoxy index and epoxy value was given by a standard curve. The standard curve can be used to determine the unknown epoxy resin’s epoxy value,and supporting data for performance testing and curing mechanism research could also be provided.

STUDY ON CURING BEHAVIOR OF EPOXY POLYAMIDE MICROWAVE CURING SYSTEM

GENG Jie, LI Yong, CHEN Yun-lei, XIAO Jun

2013, 0(5):  7-13. 

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Compared with traditional heat curing,microwave curing has the advantages of high efficiency,nonpollution, low cost of equipment and so on. As known,curing degree is determined by DSC,which is used to describe the progress of the microwave curing behavior of bisphenol-A type epoxy resin E51 /650 polyamide reaction system. According to the curing efficiency,this paper optimizes formula ratio of the system component. Then,an orthogonal experiment table was designed to investigate microwave curing process parameters and contrast glass-transition temperatures of cured roducts in two different curing methods. The results showed that the optimal proportion of the system for microwave curing is 100 to 80 to 12 ratio of epoxy E51 to 650 polyamide to 660 A active diluents. And the order of microwave curing parameters that affect the degree of cure is the heating time,the output power, heating cycle and intermittent time. In addition,the glass-transition temperature and bending property of microwave curing product is decreased at a certain extent that because of the uniformity of microwave field and the output way of microwave power.

RESEARCH ON THE SYNTHESIS OF A NOVEL EXPANSION MONOMER PREPOLYMER AND ITS MODIFYING BLENDS OF BDM/DABPA

ZHOU Wei, FANG Jun, LIU Yu-jian, ZHANG Yan

2013, 0(5):  14-17. 

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A spiro orthocarbonate expansion monomer 3,9-diethyl-3,9-dihydroxymethyl-1,5,7, 11-tetraoxaspiro[5. 5]undecane was synthesized by two steps,and then expansion monomer prepolymer was prepared by copolymerization of expansion monomer and the polyurethane prepolymer which was prepared with 2,4-toluene diisocyanate and propylene glycol. The pruducter was characterized by FT-IR spectra,1HNMR and element analysis. With the introduction of the expansion monomer prepolymer into the blends of N,N'-4,4'-diphenylmethane-bismaleimide (BMI) /O,O'-diallyl bisphenol A(DABPA), the volume shrinkage of the BMI /DABPA system was reduced.

THE HIGH-FREQUENCY DIELECTRIC PROPERTIES OF PMI FOAM AND SANDWICH STRUCTURES

ZHANG Le, ZHANG Guang-cheng

2013, 0(5):  18-21. 

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The influence of density and thickness of PMI foam on its high-frequency dielectric properties and its sandwich structures with carbon fiber or glass fiber at 10GHz was studied. The results indicate that the thickness of the PMI foam has little effect on the high-frequency dielectric properties. The high-frequency dielectric properties increased linearly with the increase of the foam density,which was consistent with the theoretically calculated values. The high-frequency dielectric properties of sandwich structures gradually thickened with the increase of the foam thickness,which was close to that of PMI foam gradually,and the law conforms to the series formula model. The high-frequency dielectric properties of glass-fiber sandwich structures was less than the carbon-fiber sandwich structures.

PREPARATION OF UNSATURATED POLYESTER RESIN-BASED PHOTOLUMINESCENT COMPOSITES

WANG Wei, SHI Jun-hu, JING Cheng-bin

2013, 0(5):  22-24. 

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Polyester resin-based photoluminescent composites were prepared by using unsaturated polyester resin with different amounts of rare-earth phosphor powders. The effects of the amounts of phosphor powders on the properties of resin were studied. The results demonstrate that resin can be combined with phosphor powders well through mechanical mix and ultrasonic operations. Luminescence quenching phenomenon is not observed and the light emission effect is enhanced with increasing the amount of phosphor powders. Phosphor powders /resin CM with the best mechanical properties was obtained when the mass fraction of phosphor powders is ten percents.

STUDY ON VISCOSITY PROPERTIES OF UPR ADDING ATH

WANG Qing-tao, LI Wei

2013, 0(5):  25-27. 

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The viscosity of the unsaturated polyester resin(UPR) adding aluminum hydroxide(ATH) was tested and analyzed at different temperatures and various contents of accelerator by digital viscosity instrument. The result shows that the temperature is the dominant factor influencing viscosity of resin and the temperature plays more important role than the accelerator on the gel time.

STUDY ON INTERFACE OF HIGH PERFORMANCE CARBON FIBER COMPOSITES

LI Jian-fang, ZHANG Ya-ting, SUN Hong-jie

2013, 0(5):  28-31. 

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The surface configuration and interface property of MT300-3K and JHT300-3K were studied,which compared with Toray T300-3K. The SEM results showed that these three kinds of carbon-fiber had the same surface configuration. The testing by single-fiber methods showed that MT300-3K and Toray T300-3K had the similar interface shear strength,which was a little higher than JHT300-3K. Laminates results indicated that MT300-3K, JHT300-3K and Toray T300-3K matched well with 601 resin system,and had the similar interface strength.

SYNTHESIS AND CHARACTERIZATION OF DOUBLE-CABLE OLIGTHIOPHENE/C₆₀ COPOLYMER

QI Yuan-jiang, LI Hui

2013, 0(5):  32-36. 

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Soluble polythiophene (PT) derivatives and fullerenes (mainly C₆₀) are the donor and acceptor materials respectively well-used in the photosensitive blend layer of the polymer solar cells. Aggregation of the fullerenes and phase separation of the donor and acceptor materials in the blend layer influence the power conversion efficiency (PCE) of the devices. So this paper synthesizes thiophene oligomers step by step through Suzuki coupling reaction and connects the thiophene oligomers with the fullerene acceptor together by covalent bond to solve the phase separation problem. By this way,the copolymer(Th₂C₆₀ Th₄C₆₀ ) can phase separation in molecular level. The molecular structures were determined by H-NMR and MALDI-Toff techniques. Cyclic voltammetry shows there’s no interaction between thiophene and C₆₀ at ground state.

PROCESSING PARAMETERS ANALYSIS AND OPTIMIZATION FOR AUTOMATED TAPE LAYING USING RESPONSE SURFACE METHODOLOGY

HUANG Wen-zong, SUN Rong-lei, ZHANG Peng, LIAN Hai-tao

2013, 0(5):  37-44. 

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Based on the analysis of automated tape laying (ATL) process,this paper proposed a new grading criteria of lay-up quality. Optimization experiment of lay-up processing parameter was designed using response surface methodology (RSM). Influences of the processing parameters,such as hot-air temperature,lay-up pressure and lay-up velocity,and furthermore,their interaction effects on the lay-up quality were analyzed. A quadratic polynomial regression equation was set up to forecast the relationship between the processing parameters and lay-up quality. Processing parameters for both the best lay-up quality and the maximum lay-up velocity in the acceptable lay-up quality were obtained by the regression equation. The proposed grading criteria and optimization method can be referred for the control of the processing parameters of ATL.

EFFECTS OF TEMPERATURE AND MOLDING RATE IN HOT DIAPHRAGM FORMING PROCESS ON THE FORMING QUALITY OF C-SHAPED COMPOSITE

BIAN Xu-xia, GU Yi-zhuo, SUN Jing, LI Min

2013, 0(5):  45-50. 

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In this study,the effects of processing temperature and molding rate on the forming quality of Cshaped carbon fiber /epoxy resin prepreg stack during hot diaphragm forming process were investigated. C-shaped prepreg preforms were produced using a home-made hot diaphragm forming equipment. The thickness variations of the preforms and the manufacturing defects after diaphragm forming process were evaluated. Furthermore,interlaminar friction behavior of the prepreg stack was experimentally analyzed for showing the importance of the processing parameters. The results show that the C-shaped prepreg preforms with good forming quality can be achieved through increasing processing temperature and reducing vacuum applying rate,which obviously promote prepreg interlaminar slipping process. The process temperature and molding rate in hot diaphragm forming process strongly influence prepreg interply frictional force,and the interlaminar frictional force can be taken as a key parameter for processing parameter optimization.

STUDY ON TEST METHODS FOR DESIGN ALLOWABLES OF RADOME

ZHOU Chun-ping, LI Xing-de, ZHU Shan

2013, 0(5):  51-56. 

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Radome for civil aircraft shall be designed to meet requirements in CCAR25. 613 "Material Strength Properties and Design Values". Through the study to the past experiences,this paper designs the test items,teststandards,test environments,as well as test specimen contents and test data treatment methods for material allowables of civil aircraft radomes. Comparison between the data obtained through the adopted ASTM methods in this paper and the results from the conventional GB standards show that the material allowable data in this paper has low coefficients of variation and higher value for allowable data. The methods thus avoided the low property value by the GB standards for glass fiber reinforces composite material. The test result has been proved successful by radome design and radome static tests of ARJ21 civil aircraft.

FEASIBILITY ANALYSIS OF ROOT T-BOLT CONNECTION FOR VINYL ESTER RESIN WIND TURBINE BLADE

LI Dong-hai, GUO Hui, YANG Ping, ZHANG Jin-nan

2013, 0(5):  57-59. 

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The mechanical properties of root T-bolt connection for vinyl ester resin wind blade was studied by static tension test,mechanical theory analysis and ANAYS finite element simulation in this article. The results show that root T-bolt connection has enough mechanical strength for vinyl ester resin wind blade,which provides some available basis for the application of vinyl ester resin in MW blade and cost-effective blade.

QUALITY CONTROL OF GLASS FIBER REINFORCED PLASTICS MORTAR PIPE OF DEFINITE-LENGTH-WINDING

YANG Jian-ming, HU Zhong-yong, LI Xi-cai

2013, 0(5):  60-61. 

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Glass fiber reinforced plastics mortar pipe has many excellent performances,which is widely used in water supply,drainage and municipal infrastructure,but there are also a lot of engineering quality problems caused due to the quality of pipe. This paper combined the production process,proposed the key points of each process quality control,and presented solutions against common quality problems.

RESEARCH AND APPLICATION PROGRESS OF LARGE-SIZED CARBON FIBER COMPOSITE CYLINDER IN STORAGE AND TRANSPORTATION OF COMPRESSED NATURAL GAS

TIAN Zhen-sheng, JIA Xiao-long, LIU Bai-yang, LI Wu-sheng

2013, 0(5):  62-66. 

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The large-sized composite compressed natural gas (CNG) cylinder shows great potentials in the exploration of ocean natural gas and the onshore transport of natural gas,which is benefit to achieving the national purpose of energy-saving and emission reduction. In this paper,the large-sized composite CNG cylinders are discussed in terms of their application requirement,foreign and domestic manufacturers,product standards and production key technologies,etc.