Flower-like structures of ZnO was synthesised by solution method using zinc acetate dihydrate and sodium hydroxide. Hydroxylamine hydrochloride (0.4M and 0.8M) was used as a structure directing agent. Structural morph...
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Octaaminophenyl polyhedral oligomeric silsesquioxane (OapPOSS) was prepared as nanofillers and filled to isotactic polypropylene (PP). Maleic anhydridegrafted PP (MAPP) was selected as compatibilizer. The morphology, ...
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Octaaminophenyl polyhedral oligomeric silsesquioxane (OapPOSS) was prepared as nanofillers and filled to isotactic polypropylene (PP). Maleic anhydridegrafted PP (MAPP) was selected as compatibilizer. The morphology, crystallization, melting behavior and rheologcial behavior of PP/OapPOSS composites with or without MAPP were studied by scanning electron microscopy, differential scanning calorimetry, polarized optical microscope, oscillatory and capillary rheological analysis. The results showed that the morphology, crystallization and rheological behavior of the composites were strongly influenced by the existence of MAPP. MAPP improves the compatibility between PP and OapPOSS because of the reaction of OapPOSS with MAPP. The OapPOSS retards the crystallization of PP while promoting it when MAPP is added. MAPP could decrease the viscosity of PP/OapPOSS probably due to the weaker particle-particle interaction and interface slipping.
A thermodynamic model was developed to understand the role of charge compensation at the interlayer interfaces in compositionally graded monodomain ferroelectric multilayers. The polarization mismatch between the ferr...
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A thermodynamic model was developed to understand the role of charge compensation at the interlayer interfaces in compositionally graded monodomain ferroelectric multilayers. The polarization mismatch between the ferroelectric layers generates depoling fields with the polarization in each layer varying from its bulk uncoupled value as to adapt to the electrical boundary conditions. By treating the strength of the electrostatic field as a phenomenological parameter, it is shown that if there are localized charges to compensate for the polarization mismatch and relax the depolarization fields, ferroelectric layers behave independently of each other and exhibit a dielectric response that can be described as the sum of their corresponding intrinsic uncoupled dielectric properties. For perfectly insulating heterostructures with no localized charges, the depolarization field is minimized by lowering the polarization difference between layers, yielding a ferroelectric multilayer that behaves as if it were a single ferroelectric material. There exists an optimum value of coupling strength at which average polarization of the multilayer is maximized. Furthermore, ferroelectric multilayers may display a colossal dielectric response dependant upon the interlayer electrostatic interactions.
Morphology and photophysical properties of DB-PPV/PMMA blend luminescence ES fibers were tuned though various solvents and DB-PPV content. The blend fiber prepared from solvents with different boiling points led to va...
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Novel hydrophobic polyvinylidene fluoride (PVDF) hollow fiber membranes were adopted in air blowing membrane absorption (ABMA) process for the purpose of bromine extraction from seawater. The effect of air blowing int...
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Novel hydrophobic polyvinylidene fluoride (PVDF) hollow fiber membranes were adopted in air blowing membrane absorption (ABMA) process for the purpose of bromine extraction from seawater. The effect of air blowing intensity, the concentration and temperature of the absorbent solution on the bromine extraction performance was investigated. The influence of the thickness of PVDF membranes, the type, length and packing density of membrane modules was studied. The results showed that the bromine absorption rate and effectual bromine flux of the membrane decreased as the membrane thickness increased. Linear type module is more feasible than U type one, when being used in ABMA bromine adsorption process. As the packing density and length of linear type module increased, the bromine absorption rate enhanced while the effectual bromine flux decreased. The membrane with inner diameter of 0.80 mm and thickness of 0.15 mm was selected, and membrane module with effective membrane length of 90mm and packing density of 14.4% was prepared. The bromine absorption rate of the module reached 68.6% and the effectual bromine flux was 0.41 kg/(m2·h), when tested at 22°C. with air blowing intensity of 500 mol/(m2·h), absorbent concentration of 10mmol/L.
Two master-batches,polyamide 66 (PA66)/organo-montmorillonite (OMMT) and polyamide 6 (PA6)/OMMT, prepared by melt compounding with methyl methacrylate (MMA) as co-intercalation agent,have been used to prepare nearly e...
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Two master-batches,polyamide 66 (PA66)/organo-montmorillonite (OMMT) and polyamide 6 (PA6)/OMMT, prepared by melt compounding with methyl methacrylate (MMA) as co-intercalation agent,have been used to prepare nearly exfoliated PA661montmorillonite (MMT) *** resulting nanocomposites are compared in view of their morphology and ***-scale dispersion of OMMT is realized in both types of nanocomposites,as revealed by XRD,TEM and Molau ***66/MMT nanocomposites having superior mecha...
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