Thermal conductive performance of organosoluble polyimide/BN and polyimide/(BN + ALN) composite films fabricated by a solution-cast method

2013 ◽  
Vol 34 (2) ◽  
pp. 252-258 ◽  
Author(s):  
D.H. Kuo ◽  
C.Y. Lin ◽  
Y.C. Jhou ◽  
J.Y. Cheng ◽  
G.S. Liou
Keyword(s):  
Composite Films ◽  
Solution Cast ◽  
Solution Cast Method

scholarly journals Investigate Salts type and concentration on the conductivity of Polymer Electrolyte

2019 ◽  
Vol 17 (42) ◽  
pp. 42-50
Author(s):  
Mohammed Kadhim Jawad
Keyword(s):  
Dielectric Constant ◽  
Polymer Electrolytes ◽  
Ethylene Carbonate ◽  
Maximum Amount ◽  
Ionic Radii ◽  
Fixed Amount ◽  
Gel Electrolytes ◽  
Solution Cast ◽  
Dielectric Constant Decrease ◽  
Solution Cast Method

Polymer electrolytes systems compose of (PEO+KI+I2) and (PEO+RbI+I2) with different concentration, and a fixed amount of ethylene carbonate (EC) and propylene carbonate (PC) over temperatures range 293-343 K prepared by solution cast method. The conductivity and dielectric constant of the gel electrolytes were studied. The conductivity of the electrolytes Ss & Hs increases steadily with increased concentration of salt KI and RbI. The higher value of conductivity of (4.7 10-3 @ RT S.cm-1) for S5 electrolyte which contains (KI 50%). Whereas the maximum amount of conductivity of (5.4 10³ @RT S.cm⁻ˡ) for H5 electrolyte which contains (RbI 50%) the ionic conductivity depends on the ionic radii of the migrating species (cation K⁺, Rb⁺) effect on it. As the temperature increase, the number of free ions also increases, thus increases the diffusion of ions through their free volume of the polymer. The dielectric constant decrease at higher frequencies due to the inability of dipoles to align quickly with the change of applied field. The dielectric constant proportional positively with variation temperature causes an increase in the dielectric constant. The higher the value of (εr), the better is the electrical conductivity.

Effect of Plasma Treatment on Surface Properties of Polymeric Membrane

2012 ◽  
Vol 585 ◽  
pp. 528-531 ◽  
Author(s):  
Awatif Saber Jasim ◽  
Khalaf Ibrahim Khaleel ◽  
Muhamad Abdul Kareem Ahmed ◽  
Y.K. Vijay ◽  
Sachin Surve
Keyword(s):  
Plasma Treatment ◽  
Surface Properties ◽  
Vacuum Chamber ◽  
High Vacuum ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Nitrogen Gas ◽  
Vis Spectroscopy ◽  
Solution Cast ◽  
Solution Cast Method

In the present work the effect of plasma treatment has been used to improve the surface properties of polymeric membranes. The polymeric membranes of polycarbonate (PC) were synthesized using solution cast method. The plasma treatment was done in high vacuum chamber using nitrogen gas and the pressure for the plasma treatment was » 10-2 mbar. The effect of plasma treatment on surface properties like morphology, roughness, wettability and optical properties has been characterized using optical microscopy and UV-Vis spectroscopy for different time of plasma treatment.

Influence of Evaporation Temperature on the Morphology, Polymorph and Mechanical Properties of Poly(vinylidene fluoride) Solution-Cast Membranes

2014 ◽  
Vol 1015 ◽  
pp. 536-539
Author(s):  
Jie Liu ◽  
Ji Ding Li ◽  
Xiao Long Lu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Vinylidene Fluoride ◽  
Dense Structure ◽  
Fluoride Solution ◽  
Evaporation Temperature ◽  
Α Phase ◽  
Poly Vinylidene Fluoride ◽  
Solution Cast ◽  
Solution Cast Method

In this study, PVDF membranes were prepared by solution-cast method. The effects of evaporation temperature on the morphology, polymorph and mechanical properties of such prepared membranes were studied. It was found that perfect spherulites were observed in the solution-cast membranes. FESEM photomicrographs of the membranes showed dense structure. PVDF mainly crystallized into α phase. In the solution-cast process, the spherulite size increased as evaporation temperature was increased from 120 °C to 150 °C, when the evaporation temperature was 165 °C, spherulite size decreased. And the tensile strength increased with the decrease in spherulite size.

Variation of Optical Band Gap Width of PVA Films Doped with Aluminum Iodide

2011 ◽  
Vol 383-390 ◽  
pp. 3257-3263 ◽  
Author(s):  
Omed Ghareb Abdullah ◽  
Sarkawt Abubakr Hussen
Keyword(s):  
Dielectric Constant ◽  
Band Gap ◽  
Localized States ◽  
Complex Dielectric Constant ◽  
Energy Gaps ◽  
Solution Cast ◽  
Aluminum Iodide ◽  
Gap Width ◽  
Solution Cast Method ◽  
Composite Samples

Polymer composite of polyvinyl alcohol (PVA), Aluminum Iodide have been prepared by solution cast method for different doping concentrations. The absorption of pure and doped films have been investigated in the visible and ultraviolent wavelength regions. It was found that the optical absorption is due to direct and indirect transitions, and the optical energy gaps values shifted to lower energies on Aluminum Iodide doping concentration for all transitions, while the band edge width of the tail localized states increase with increasing Aluminum Iodide concentration. The band gap of all films shows to be decrease after thermal treatment. The optical constants refractive index n, extinction coefficient k, the complex dielectric constant have been also calculated. The dielectric constant increased in the composite samples as compared with the pure PVA sample prepared by the same method.

scholarly journals Impact Value of High Electric Conductive ABS Composites with Copper Powder Dispersion Prepared by Solution-Cast Method

2010 ◽  
Vol 51 (1) ◽  
pp. 165-170 ◽  
Author(s):  
Yoshitake Nishi ◽  
Nobuaki Kunikyo ◽  
Masae Kanda ◽  
Laurent Lebrun ◽  
Daniel Guyomar
Keyword(s):  
Copper Powder ◽  
Powder Dispersion ◽  
Solution Cast ◽  
Solution Cast Method

Preparation of Polymethyl Methacrylate-NaYF4:Yb:Er Composite Material Used for Holographic Display

2011 ◽  
Vol 284-286 ◽  
pp. 2292-2295
Author(s):  
Li Liu ◽  
Ting Gao ◽  
Jie Zhou ◽  
Xing Huang
Keyword(s):  
Composite Material ◽  
Fourier Transform ◽  
Rare Earth ◽  
Infrared Spectroscopy ◽  
Polymethyl Methacrylate ◽  
Holographic Display ◽  
Luminescent Spectroscopy ◽  
Solution Cast ◽  
Analyze Structure ◽  
Solution Cast Method

In this study, we successfully prepared polymethyl methacrylate (PMMA) /NaYF4:Yb:Er up-conversion composite luminescence material by solution cast method. PMMA was used for polymer matrix, and NaYF4:Yb:Er for rare earth up-conversion luminescence component, and this composite material was prepared for holographic display. Fourier transform infrared spectroscopy (FTIR) and luminescent spectroscopy were measured to analyze structure and luminous performance of the composite material respectively.

Crystalinity Properties of Carbon Nanotube-Polyvinylidene Fluoride Composites

2008 ◽  
Vol 1134 ◽  
Author(s):  
Xiaobing Shan ◽  
Pei-xuan Wu ◽  
Lin Zhang ◽  
Zhong-Yang Cheng
Keyword(s):  
Differential Scanning Calorimetry ◽  
Carbon Nanotube ◽  
Acid Treatment ◽  
Polyvinylidene Fluoride ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Β Phase ◽  
Solution Cast ◽  
Solution Cast Method

AbstractSingle-wall and multi-wall carbon nanotube blends (0 to 0.5 vol% ) with polyvinylidene fluoride (PVDF) have been prepared using solution cast method and characterized. By acid treatment, it has been observed that nanotube has been well functionalized and uniformly dispersed into the polymer. X-ray diffraction analysis coupled with differential scanning calorimetry (DSC) has revealed that carbon nanotube alters the crystallinity of PVDF and thereby enhances the β-phase in PVDF. Experimental results have demonstrated that enhancement of β-phase is a function of carbon nanotube concentration.

Temperature Dependence Study of Gas Permeability in Metal Doped Composite Polymeric Membranes

2006 ◽  
Vol 973 ◽  
Author(s):  
Yogesh Kumar Vijay ◽  
Anil Kumar Jain ◽  
Naveen Kumar Acharya ◽  
Kamlendra Awasthi ◽  
Vaibhav Kulshrestha
Keyword(s):  
Composite Membrane ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Polymeric Membranes ◽  
Plasticization Effect ◽  
Optical Micrograph ◽  
Solution Cast ◽  
Metal Doped ◽  
Increasing Temperature ◽  
Solution Cast Method

ABSTRACTPolycarbonate (PC) membrane and PC based hydrogen active intermetallic compound Fe0.5Ti0.5 particles doped composite membrane have been prepared by solution cast method. The membranes have been characterized by H2 and CO2 permeability and selectivity measurements with increasing temperature. Higher gas permeation has been observed with increasing temperature. In case of doped composite membrane H2/CO2 gas pair selectivity first increases then decreases with temperature whereas in case of pure PC it decreases with temperature. The effect of doping increases the activation energies for permeation of H2 and CO2 in the doped membrane in comparison to pure PC. Doping was found to suppress plasticization effect in polycarbonate. The doped membrane was analyzed by optical micrograph and XRF study.

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