scholarly journals Study of the influence of the parameters of the preparation process on the structure of a highly porous copolymer of styrene and divinylbenzene

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 103-106
Author(s):  
P. S. Zagoskin ◽  
◽  
S. A. Shirokikh ◽  
A. A. Fenin ◽  
M. Y. Koroleva ◽  
...  
Keyword(s):  
Preparation Process ◽  
Drying Temperature ◽  
Radiation Polymerization ◽  
Styrene Divinylbenzene ◽  
Porous Copolymers ◽  
Average Size ◽  
Porous Copolymer ◽  
Concentrated Emulsions ◽  
Highly Porous

The effect of polymerization parameters and drying temperature on the structure of a porous styrene-divinylbenzene copolymer obtained on the basis of highly concentrated emulsions was investigated. The structure of this material consisted of two types of pores: voids with an average size of 3.5±0.3 μm and holes in the pore walls with an average size of 0.7±0.2 μm. It was determined that both in materially initiated and radiation polymerization, porous copolymers of styrene and divinylbenzene with the same structure are formed.

scholarly journals Preparation of LiFePO4 Powders by Ultrasonic Spray Drying Method and Their Memory Effect

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3193
Author(s):  
Tu Lan ◽  
Xiaolong Guo ◽  
De Li ◽  
Yong Chen
Keyword(s):  
Spray Drying ◽  
Memory Effect ◽  
Electrode Materials ◽  
Average Particle Size ◽  
Lithium Ion ◽  
Average Particle ◽  
Preparation Process ◽  
Drying Method ◽  
Drying Temperature ◽  
Ultrasonic Spray

The memory effect of lithium-ion batteries (LIBs) was first discovered in LiFePO4, but its origin and dependence are still not clear, which is essential for regulating the memory effect. In this paper, a home-made spray drying device was used to successfully synthesize LiFePO4 with an average particle size of about 1 μm, and we studied the influence of spray drying temperature on the memory effect of LiFePO4 in LIBs. The results showed that the increasing of spray drying temperature made the memory effect of LiFePO4 strengthen from 1.3 mV to 2.9 mV, while the capacity decreased by approximately 6%. The XRD refinement and FTIR spectra indicate that the enhancement of memory effect can be attributed to the increment of Li–Fe dislocations. This work reveals the dependence of memory effect of LiFePO4 on spray drying temperature, which will guide us to optimize the preparation process of electrode materials and improve the management system of LIBs.

Synthesis of Silica Aerogel Using Silica Sol by Ambient Drying Method

2017 ◽  
Vol 726 ◽  
pp. 199-203 ◽  
Author(s):  
Da Sun ◽  
Xue Ye Sui ◽  
Chang Ling Zhou ◽  
Nai Hong Han ◽  
Fu Tian Liu
Keyword(s):  
Pore Volume ◽  
Silica Aerogel ◽  
Normal Pressure ◽  
Silica Sol ◽  
Raw Material ◽  
Drying Method ◽  
Gel Time ◽  
Drying Temperature ◽  
Average Size ◽  
20 Nm

In this experiment, silica sol was used as raw material, the mixture of ammonium chloride and ammonia was used as coagulant. After replacing the solvent with n-hexane, silica aerogel was obtained under the condition of normal pressure. The influence of sol pH and coagulating temperature on the gel time was studied. According to the SEM photographs, the influence of drying temperature from 30 °C to 60 °C on the microstructure of silica aerogel was analyzed. This study showed that when sol pH was 6.5, coagulating temperature was 80 °C and the concentration of ammonia was 0.4 mol/L, the gel time was the shortest. The average size of silica aerogel particles was 10-20 nm, the average size of apertures was 20-50 nm. When the drying temperature was 40 °C, the specific surface area was 402.41 m2/g, the pore volume was 2.33 cm3/g, the density was 0.18 g/cm3.

Radiation polymerization of tetrafluoroethylene adsorbed of some highly porous substrates

1975 ◽  
Vol 17 (1) ◽  
pp. 1-12 ◽  
Author(s):  
M.A. Bruk ◽  
A.D. Abkin ◽  
V.V. Demidovich ◽  
L.B. Yeroshina ◽  
Ya.G. Urman ◽  
...  
Keyword(s):  
Radiation Polymerization ◽  
Highly Porous ◽  
Porous Substrates

Controlling pore sizes in highly porous Poly(Styrene-Divinylbenzene) sponges for preferable oil sorption

2019 ◽  
Vol 77 ◽  
pp. 105931 ◽  
Author(s):  
Marina Y. Koroleva ◽  
Sergey A. Shirokikh ◽  
Pavel S. Zagoskin ◽  
Evgeny V. Yurtov
Keyword(s):  
Pore Sizes ◽  
Oil Sorption ◽  
Styrene Divinylbenzene ◽  
Highly Porous ◽  
Porous Poly

Effect of the glass-transition temperature of latexes on drying-stress development of latex films and inkjet coating layers

2020 ◽  
Vol 35 (4) ◽  
pp. 660-669 ◽  
Author(s):  
SangGil Lee ◽  
Sunhyung Kim ◽  
Hak Lae Lee
Keyword(s):  
Crack Formation ◽  
Coating Layer ◽  
Porous Silica ◽  
Sudden Increase ◽  
Drying Temperature ◽  
Stress Development ◽  
Coated Papers ◽  
Coating Layers ◽  
Stress Patterns ◽  
Highly Porous

AbstractHighly porous silica pigments and PVOH binder are commonly used for inkjet coated papers. The use of PVOH increases the viscosity of coating colours and increases drying stresses in the coatings. In this study, the possibility of using S/A lattices as inkjet binders to decrease the viscosity of inkjet coatings and meet the quality requirements of the inkjet papers was investigated. Three S/A latices were prepared and tested as binders for inkjet coating. The effect of drying temperature and binder {T_{\mathrm{g}}} on the drying stress development and crack formation in the coating was investigated. The results showed that the {T_{\mathrm{g}}} of S/A latices, drying temperature, and PVC influenced the drying-stress patterns during drying. Drying stress decreased as the {T_{\mathrm{g}}} of the latex decreased and the drying temperature increased. The presence of silica pigment caused a sudden increase and then decrease of the drying stress due to cracking of the coating layer. Two S/A latices gave coating colours with lower Brookfield viscosities and drying stresses than conventional PVAc latex, and they also gave coatings similar in brightness, opacity, gloss and roughness to the conventional latex coating.

Thermodynamic and Kinetic Analyses of Calcined Kaolin Precursors Used for Synthesis of Mullite Nanocomposite

2010 ◽  
Vol 148-149 ◽  
pp. 1751-1754
Author(s):  
Nan Chun Chen ◽  
Han Mei Ao ◽  
Wei Wang ◽  
Quan Hong Li ◽  
Ai Ping Deng
Keyword(s):  
Reaction Order ◽  
Reaction System ◽  
Preparation Process ◽  
Calcine Temperature ◽  
Crystallization Property ◽  
Thermodynamics And Kinetics ◽  
System Temperature ◽  
Average Size ◽  
Calcined Kaolin ◽  
Kinetics Of

Mullite precursor was prepared from kaoline when calcined at 1250 °C，when the concentration of sodium hydroxide of 3 mol/l; crystallization temperature of 80 °C; holding time of 3 h and precursor concentration of 0.15 g/ml, the morphology of the prepared mullite nanocomposite appears spherical-like, and it has good crystallization property and low agglomeration, and the average size of the particles is about 60.9 nm. Both the thermodymics and kinetics of mullite precursor have been studied. The results are as follows: the reaction started when the calcine temperature T﹥495°C; mullite precursor formed when the reaction system temperature 1000 °C; the activation energy of precursor Ea=928.3 KJ/mol; the reaction order n=1.33. We have reported our successful experiments to use kaolin to synthesize mullite nanocomposite with satisfying, spherical morphology, relatively homogenous grain average size of 60.9 nm, and little aggregation[1-2]. This paper presents an investigation of the thermodynamics and kinetics of the precursor preparation process.

Highly Porous Cationic Polyelectrolytes via Oil-in-Water Concentrated Emulsions: Synthesis and Adsorption Kinetic Study

Langmuir ◽  
2018 ◽  
Vol 34 (35) ◽  
pp. 10353-10362 ◽  
Author(s):  
Sebastijan Kovačič ◽  
Nina Drašinac ◽  
Albin Pintar ◽  
Ema Žagar
Keyword(s):  
Kinetic Study ◽  
Adsorption Kinetic ◽  
Oil In Water ◽  
Concentrated Emulsions ◽  
Cationic Polyelectrolytes ◽  
Highly Porous

Synthesis and characterization of polyHIPE composites containing halloysite nanotubes

e-Polymers ◽  
2016 ◽  
Vol 16 (6) ◽  
pp. 419-428 ◽  
Author(s):  
Hatice Hande Mert ◽  
Sinan Şen
Keyword(s):  
Organic Phase ◽  
Composite Structures ◽  
Dye Adsorption ◽  
Halloysite Nanotubes ◽  
Ionic Surfactant ◽  
Degradation Temperature ◽  
Internal Phase ◽  
Styrene Divinylbenzene ◽  
Concentrated Emulsions

AbstractHigh internal phase emulsion templated-polymer (polyHIPE) composites were prepared from spirulina modified halloysite (HL) nanotube containing styrene/divinylbenzene based water-in-oil type concentrated emulsions. In order to obtain a stable emulsion for neat polyHIPE’s synthesis, at least 5 vol% Span-80 as a non-ionic surfactant, with respect to organic phase was needed. For syntheses of polyHIPE composite structures, this amount was decreased to 2 vol%, even in presence of 0.25 wt% modified nanotube with respect to the organic phase. All the polyHIPE composites exhibited open pore structures with pore interconnections together with partially or completely closed pores. The composite having 0.25 wt% modified nanotube and 2 vol% surfactant was found to have about 260% higher dye adsorption capacity and the highest onset degradation temperature in comparison with neat polyHIPE.

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