Materials Literature
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A series of waterborne polyurethane emulsion modified by epoxy resin were prepared with epoxy resin(E-44) as crosslinker.Fourier transform infrared spectroscopy(FT-IR),thermogravimetry(TG) and transmission electron microscope(TEM) were used to characterizer the structure of the polyurethane and particle morphology of…
Objective To study the preparation method of acellular vascular matrix and to evaluate its biocompatibility and safety so as to afford an ideal scaffold for tissue engineered blood vessel.Methods Fresh caprine carotids(length,50 mm) were harvested and treated with repeated frozen(—80 ℃)/thawing(37 ℃),cold isostatic pr…
SiC coating was produced by isothermal chemical vapor deposition(CVD) on graphite substrate with trichloromethyl silicane (MTS)-H2-Ar system.Effects of deposition temperature and total gas pressure as well as gas flow rate on morphology and composition of the as-prepared coating were investigated.SEM and AFM observati…
The ring-opening polymerization(ROP) of lactide in the presence of amino acid was investigated.Effects of amino acid concentration,pH value,and reaction condition on the molecular weight of the polymer were discussed.For the ROP of D,L-lactide,the molecular weight of polymer increased with increasing basicity of amino…
Self-consistent field theory is proposed to investigate equilibrium polymers adsorbed between two parallel plates.According to numerical results,the adsorption behavior of the equilibrium polymers can be classified into two regimes,viz.weak adsorption and strong adsorption.For strong adsorption,the apparent adsorption…
Chromizing on a low carbon steel was perfomed by a double glow plasma surface metallurgy technology at different temperatures. Phase structure, chromium content and surface hardness of the chromized layers obtained by different processes were measured. The results show that the deposited layer or the diffusion layer o…
The nanocrystalline nickel powder were prepared by high-energy ball milling and DC arc plasma evaporation method respectively,subsequently the two kinds of powder were consolidated into bulk nanocrystalline nickel by cold compaction and sintering.The structure and morphology change of the bulk nanocrystalline Nickel w…
Phosphorus-containing silicate opal glasses were prepared by means of conventional melt quenching technology,and opaque mechanism and microstructure of the glasses were investigated by XRD,SEM and EDS methods.The influence of R2O3(R=Al or B) content on the microstructure and the thermal expansion coefficient was inves…
The crystal growth of protein molecules is a result of interactions of protein molecules with surrounding environments,which can be divided into three stages,nucleation,growth and ending.The nuclei can be obtained by the screening and seeding of the crystallization.Uni-crystals are achieved by trimming,modification an…
In comparison with metal,the carbon fiber reinforced composites are light-weight and highly designable.This paper aims to design and fabricate a carbon fiber reinforced composites mast with light weight.The hollow mast with uniform wall thickness and irregular cross section was designed based on the equivalent stiffne…
Microstructure and mechanical properties of cast Ti2.5Al1.5MoZr alloy at different solution temperatures and different cooling rates were investigated.The results show that in the range of 850-920 ℃,with the increase of solution temperature,the microstructures of alloy were refined,quantity of short-rod primary α phas…
Objective:to optimize the process of cross-linked esterification potato starch by compared the changes of product characteristics.Methods:single factor test and SAS8.2 statistical software analysis were applied.The optimal condition was:cross-linked esterification temperature was 35℃,the dosage of cross-linker was 0.3…
Taking regenerated solution of waste silk fibroin as material,the effects of the application of ultrasound,reactant concentration,time,temperature,pH and enzyme concentration on silk peptide hydrolyzed by alkaline protein enzyme and silk amino acid mixture were investigated by using single factor experiment.The optima…
The effects of rare earth(RE) on the process of Ni-P-SiC composite plating were studied.The results show that a amount of RE can multiplely increase the deposition of SiC particles.RE deposites with Ni,P particles together,while the micro-alloying occurs,forming the composite coating with RE.
Polylactic acids modified by triallyl isocyanurate were studied,their relative structure and properties were systematically characterized and compared by FTIR,DSC,TG,X-ray diffraction,heat shrinkage and breakage strength respectively.At the temperature of 130℃,the heat shrinkage of the heat-resistant PLA is 28.9% of g…
Presently the iron and steel makers are compelled to incorporate rational initiatives to reduce its processing CO_2 total emissions.In the medium and long term,the injection of small particles of biochar through the tuyerees in blast furnaces,here called Bio-PCI,offers attractive features from the environmental and me…
Ultra-high molecular weight polysiloxane composed with fumed silica or polypropylene resin was applied as plastic additive into systems of calcium carbonate/polypropylene or barium sulfate/polypropylene.And effects of the additives on the fluidity and mechanical properties of PP systems were studied.Results showed tha…
OBJECTIVE The absorption spectral properties,fluorescence spectral properties and the singlet oxygen quantum yield in photo-induced chemical processes of Zinc 2(3),9(10),16(17),23(24)-tetra(trifluoroethoxy) phthalocyaninate(ZnPcF) were determined.METHODS UV and fluorescence spectrophotometrics were used to measure the…
The domestic related mature SMA mixture graded scope was referenced and utilized,combined with Karemary oil field highway engineering practice,it started from SMA mixing proportion design aspect,the SMA modified oil field highway pavement material was studied experimentally,and how to guarantee best pavement performan…
The ideal spheroidizing annealing parameters of steel T10A were found out under the effect of impulse electric field through the orthogonal experiment.Through the corresponding experiments of the new technology,the better ball-body microstructure of T10A steel is obtained,while the annealing temperature of T10A steel…