We fabricate transparent MgAl2O4 nano-ceramics, which are composed of 40 nm grains, by sintering under high pressure and low temperatures. Analysis the grain size, differential strains, yield strength porosity obtained from transmission electron microscopy x-ray diffraction indicates that pores at boundary triple junctions can retard migration thus prevent growth. It is found relatively density for nano-ceramics produced low-temperature attributed mainly to large energy in exteriors. The...

Although the breakdown of continuum model at nanoscale has been predicted, origin failure is not well understood. This in turn affected our better understanding interparticle forces. In this work, interaction forces including van der Waals (vdW) attraction, Born repulsion and mechanical contact between crystalline silicon carbide nanospheres are studied using molecular dynamics (MD) simulations. The deviation from Hamaker approach fully analyzed ascribed to underestimated number density...

ABSTRACT Polyester polyol (PP)‐based polyurethanes (PUs) consisting of two difunctional acids [1,4‐cyclohexanedicarboxylic acid (CHDA) and 1,6‐adipic (AA)] also diols [1,4‐cyclohexanedimethanol (CHDM) 1,6‐hexanediol (HDO)] were synthesized by a two‐step procedure with variable feed ratio CHDA to AA but fixed CHDM HDO. The prepared PPs and/or PUs characterized Fourier transform infrared spectroscopy, X‐ray diffraction atomic force microscopy. effects on the thermal, mechanical, dynamic...

Due to the limitation of later stage intelligent algorithms, fruit and vegetable fresh-keeping cold chain transportation scheme did not meet expectation could achieve dual objectives shortest time lowest consumption at same time. In order solve above problems, a model in low-temperature storage environment is proposed. The based on topology network. By setting assumptions model, objective composed three parts: vehicle power fuel cost, refrigeration total loss cost. Under six constraints,...

A kind of intelligent release fresh-keeping composite packaging films with its preparation methods and experimental results were introduced. This novel film has three structural layers: the inner layer to control which are formed by a certain proportion EVA/LDPE blended resins; interlayer generate SO2 fresh keeping agent composed polyurethane binder, sodium metabisulfite calcium sulfite served as adhesive layer; outer designed barrier avoid diffusion outside. The properties varied different...

The properties of interphase in polymer composites are often different from those bulk matrix, which may include chemical, physical, microstructural, and mechanical properties. nature is critical to the overall performance materials, particular nanofiller reinforced composites. Experimental efforts have been made determine effective thickness its properties, for example, by nanoindentation nanoscratch techniques. Yet, it very difficult quantify because nanoscale unclear boundary. In this...

The ultraviolet (UV) fluorescent anti-counterfeiting offset printing ink, which can emit visible light (400-800 nm) under the excitation of (200-400 nm), has been extensively adopted in modern technology. In this paper, we used red-emitting phosphor BaCaBO3F: Eu3+, Li+ as pigment for ink and investigated influence on additive amount luminescence properties order to determine a more ideal ratio .Besides, shear viscosity, thixotropy, visco-elasticity temperature dependence viscosity according...

In our previous work, molecular dynamics simulation was used to calculate Young’s modulus of both fully and partially exfoliated effective clay (montmorillonite, MMT) clusters. this we expand that work predict the overall moduli nylon 6/MMT nanocomposites. First, a micromechanics method (i.e. rule-of-mixtures) is shown be in calculating clay-based polymer Then, nanocomposites with either well-aligned or randomly dispersed clusters various volume fractions are calculated based on individual...

Using sodium hydroxide as its alkali catalyzer, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride quaternary agents, cationic starch with high degree of substitution was made by semi-dry process. The prepared contains groups the infrared spectrum analysis. From scan electron microscope pictures and starch, can be clearly seen to have substituted salt structure mutual penetration flexible rigid has formed. tensile strength paper improved is far more than that low poly diallyl dimethyl...

Polyvinyl alcohol (PVA) is a kind of biodegradable film material, and its degradation process mainly done through PVA-degrading enzymes, but the biodegradation cycle longer, so it needs other polymers with favorable biodegradability to improve rate in nature environment. In this paper mechanism PVA films influence structural feature on were described. The research development starch-based by blending starch reduce was emphasized modified chitosan properties briefly

Ethylene is a kind of plant hormones, which can promote postharvest fruit mature and age rotten. Banana typical type after-ripening fruit, very sensitive to ethylene, it get decay easily in the process transportation selling, results shortened shelf life. Considering situations above, self-made with zeolite that adsorption ethylene. And then have melted blending LDPE film, prepared five kinds different modified films ethylene adsorption. Through experiment analyzing quality changes banana...

Molecular dynamics simulations together with micromechanics method have been proven an effective approach to assess the elastic moduli of either partially or fully exfoliated (i.e. single-layer) clay (montmorillonite) cluster. In this work, similar was adopted estimate overall compressive modulus nylon 6/montmorillonite nanocomposites. detail, single-layer cluster along lateral longitudinal directions first determined by performing molecular simulations, and then, two-layer three-layer...

The application of hydrated calcium silicate as filler in paper from wheat straw pulp is studied this paper. It shows that with the increase dosage silicate, stiffness improves, and whiteness printing color density improve, but tightness tensile strength decrease. When CPAM 0.45 g/kg, tightness, strength, tearing index, reach large value. Paper ash content increased amount gains not big after reaches 20%.

Dual phase grating x-ray interferometry is compatible with common imaging detectors, and abandons the use of an absorption analyzer to reduce radiation dose. When using tubes, absorbing source must be introduced into dual interferometer. In order attain a high fringe visibility, in this work we conduct quantitative coherence analysis find how affects visibility. Theoretical shows that generalized Lau condition satisfied, visibility influenced by duty cycle transmission through bar. And...

A series of waterborne polyurethane (WPU) with different soft segment structures were sythesised, and the effects structure molecular weight on degree PU microphase separation evaluated by infrared spectroscopy (FTIR) computer peak fitting. The experiment results indicated that phase between hard segments poly (ether–urethane) was more significant than (ester–urethane), based qualitative analysis N–H stretching region FTIR spectrum. And carbonyl showed lower had a higher relative amount...

In this study, six kinds of different films from LDPE (Low-density polyethylene) modified by EVA (Ethylene - vinyl acetate copolymer) were made, and / mass ratio was 0/50, 1/49, 1/ 19 4/21, 1/3. Influence amount on the properties film investigated using Instron universal testing machine, DSC, oxygen permeability tester breathable apparatus. The mechanical blended showed that when content 5%, transverse Young's modulus increased about 50%, vertical 56%, which is good for improving overprint...

1-MCP is an ethylene inhibitor which can effective reduce the grape respiration. SO 2 controllable-release packaging film a self-made three-layer composite release fungicide intelligently. In this work, we investigated combined effects of and on grapes preservation under 5°C over 75 days. Grapes (C.V. Muscat Hamburg) were packed in three groups: with without sachet, LDPE as control. Then, headspace gas concentration was evaluated. The physiological properties grapes, including weight loss,...

With the purpose of extending shelf-life Kyoho grapes at room temperature (23±1°C), we investigated effects two kinds preservation packaging on grapes’ shelf-life: SO 2 controlled release (A bag) and A with 1-MCP (A-1-MCP bag), naked packaged LDPE as control groups. During experiment, headspace concentrations, appearance quality, water loss, stem browning, solidity, TSS TA were tested analyzed every days. The experimental results showed that bags could form a suitable modified atmosphere...

The starch-acrylamide-diallyl dimethyl ammonium chloride graft copolymer (St-AMDADMAC copolymer) was prepared firstly. Then the synthesized St-AM-DADMAC analyzed by FTIR and SEM. Finally copolymers were applied in making packaging paper, first pass retention mechanical properties of made paper determined. indicated that AM DADMAC can be grafted chain starch. SEM starch surface had been changed obviously grafting copolymerization. increased with increase degree cationic St- AM-DADMAC...

In this paper, super absorbent polymer was prepared through graft copolymerization by cellulose and acrylic acid (AA), acrylamide (AM), butyl methacrylate (BMA) its properties were determined. It showed that optimum reaction condition is the amount of cellulose, AA, AM BMA 10g, 4.5g, 2g 1.5g respectively, initiator (potassium persulfate) N,N'-methylene bisacrylamide 0.01g 0.012g, pH value AA after neutralization 7. The water absorbency to distilled water, tap salt solution which under these...

Using starch as the stabilizing agent, glucose reducing nano-size silver particles colloidal sols have been synthesized via ultrasonic irritation in aqueous solution. The nanoparticles size distribution typical sol is from 15 to 45 nm. nanoparticles-PE blend film with content of 86 ppm was prepared by mixing colloids PE master batch and then blowing. nano-silver show effective antibacteial activity Staphylococcus aureus Escherichia coli. pear fruit package application has demonstrated that...

Filler is one of the most important components paper. Silica a kind excellent filler for its special chemical structure. was prepared in laboratory, and applied into The dispersion properties silica with different sizes paper sheets, effect smash on property zeta potential newspaper pulp system, retention agent cationic polyacrylamide system sheet were measured. results show that fineness used factor which affects dispersion. addition use increase system. precipitated increases whiteness...

The finite element model of a 0201 V-shaped, U-shaped, and UV-shaped single corrugated board boxes are established. stress distribution strain the three types waveform box to withstand pressure top surface stacking calculated. Three kinds compression analyzed. Analysis structure shows that V-shaped has good rigidity, U-type cushioning properties, range during which UV type is better choice. This consistent with experimental results, prove validity analysis, provide data basis for...