Materials Literature
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Porous carbons were prepared by the carbonization of water soluble chitosan and they were then used to synthesize porous C/NiO composites.Transmission electron microscopy(TEM),X-ray diffraction(XRD),and nitrogen adsorption-desorption experinents were used to characterize the structure and morphology of the products.Th…
OBJECTIVE To study the influence of humidity and temperature on the stability of Aspirin in the solid state.METHODS The stepped humidity and temperature controlled experiment was applied for evaluating the influence of humidity and temperature on the stability of Aspirin.Kinetic parameters were obtained by two individ…
Several compounds affecting the thermal stability of PVC were investigated.The synergistic effects among several stabilizers and optimum mixed results were studied and determined.The research results show that NaOH,Fe3+,benzoyl peroxide(BPO) all have negative effects on the thermal stability of PVC;Ca/Zn with epoxidiz…
Two new thioantimonates [Co(en)3](Hen)SbS4(1) and [Ni(en)3]2Sb2S5(2)(en = ethylenediamine) have been solvothermal synthesized and structurally characterized.1 consists of discrete tetrahedral [SbS4]3-anion with complex cation [Co(en)3]2+ and protonated [Hen]+ cations serving as charge compensating ions,while 2 consist…
Alkali pretreatment of the corn straw increased the content of cellulose from 39% to 81%.The influence of the material ratio,the temperature of etherification and alkalization and the reaction time were researched.The result indicate that the optimized conditions are as follow: m(cellulose)∶m(NaOH)∶m(ClCH2COOH) =1∶1∶1…
Homogeneous polyimide(PI) membrane was prepared by pyromellitic dianhydride (PMDA) and 4,4-diaminodiphenyl(ODA).The imidization was studied by IR.PI membrane was investigated for pervaporation(PV) separation of cyclopentadiene(CPD)/methylcyclopentadiene (MCPD) binary systems.The results show that the polyimide membran…
In this paper,oblique penetration of big length-to-diameter ratio rod into metal plate at high speed is simulated with LS-DYNA.Some important physical changes in the Penetration process are studied.The research also explores some propagating characteristics of stress wave in the penetration,and gets some practical res…
By using optical microscopy,scanning electron microscopy and its incidental EDS and electronic universal testing machine,microstructure and mechanical properties of the Mg-5Zn-xEr-1.5Nd-0.5Zr(1.1x2.8) magnesium alloy were studied.The results show that with the increase of Er content in the alloy,its grain size reached…
Problems,such as unfirm adhesion of strip,deformation of strip,unqualified curved profiles,strip displacement,poor appearance quality and die block during molding,occurred during the practical co-extrusion of PVC and strip were analyzed,and the corresponding measures were proposed.
A novel siloxane fluorinated polyacrylate emulsion(FLHDV) was prepared by copolymer-ization of dodecafluoroheptyl methacrylate(RfAA),lauryl methacrylate(LMA),2-hydroxypropyl acrylate(HPA),dimethylaminoethyl methacrylate(DM) and vinyltrioxethylsiloxane(VTES) with the(NH4)2S2O8 as a water soluble initiator and cationic/…
Due to the increasing scarcity of oil resources and increasing demand of functional fiber,the natural biodegradable fibers that can replace the synthetic fiber has been attracted more attention and the market demand of dissolving pulp with higher cellulose content and homogeneous reactivity is increasing.This paper re…
In this paper,we report development of a data acquisition system for XAFS(X-ray absorption fine structure) analysis of samples of extremely low concentrations on the BL14W1 beamline at Shanghai Synchrotron Radiation Facility(SSRF).The system includes an XFlash 5040 silicon drift detector,ion chamber,amplifier,ADC etc.…
Pure and SrWO4-ZnO composites were successfully prepared by solvent-thermal method,and also were characterized by XRD,TG,ICP,UV-Vis and PL spectra.The influence of ZnO amounts in the SrWO4-ZnO on the photocatalytic properties for methylene blue was investigated carefully.Moreover,the PL spectra,UV-Vis spectra and phot…
The principles of high pressure casting were first described,and then a design for the mold plates of a certain type of high-pressure casting machine used for daily ceramics was finished and analyzed by FEA.The designed mold plates can be used for both the horizontal and vertical casting machines.Results show that the…
A method has been proposed for the simultaneous determination of trace Ni,Cd and Pb in water samples by X-ray fluorescence spectrometry(XRF) after electrodeposition for preconcentration and sample preparation.The elements of interest are electrodeposited out of the solution onto a polished substrate of high purity cop…
Outlast temperature-regulating acrylic fiber/ cotton fiber blended yarn(50/50,16.2 tex) was chosen as the raw material and woven into fabrics by single circular knitting machine.The knitted fabrics of single close-knit weave were bleached,dyed and finished.The key points and the main difficulties of the processing wer…
In order to make as-cast nodular cast iron and achieve high strength and high toughness requirements,the following experiments were conducted: right choosing the raw materials and ingredient,reasonable designing chemical composition,using indution furnace for melting process;spheroidizing treatment process using feedi…
0.4CaTiO3-0.6(Li1/2Nd1/2)TiO3(CLNT) microwave dielectric ceramics were prepared by conventional solid reaction method.The effects of BaCu(B2O5)(BCB) and 2ZnO-B2O3(ZB)glass composite sintering additive on sintering behavior,phase composition,micromorphology and dielectric properties of CLNT ceramics were investigated.T…
Effects of Zn additions and T61 heat treatment on the microstructure and mechanical property of AM magnesium alloy with squeeze cast are investigated in the paper. The results indicate that, with the increase of Zn concentration, the ultimate tensile strength of AM Mg alloy increases while the elongation decreases dra…
Low density polyethylene was fractionated by means of solvent-gradient elution fractionation(SGEF).The fractions had different molecular weight and narrower molecular weight distribution.The branching content in each fraction was given by Carbon-13 nuclear magnetic resonance(NMR).It was found that the fraction with hi…