Synthesis of syndiotactic-polystyrene based porous polymers by polymerization-crystallization induced phase separation in poor solvent

2021 ◽  
Author(s):  
Naofumi Naga ◽  
Keiichi Noguchi ◽  
Tomoaki Kouya ◽  
Kei Nishii
Keyword(s):  
Phase Separation ◽  
Porous Polymers ◽  
Syndiotactic Polystyrene ◽  
Poor Solvent

Planar Phase Separation of Weak Polyelectrolyte Brushes in Poor Solvent

2017 ◽  
Vol 55 (4) ◽  
pp. 370-377 ◽  
Author(s):  
Kai Gao ◽  
Logan T. Kearney ◽  
John A. Howarter
Keyword(s):  
Phase Separation ◽  
Polyelectrolyte Brushes ◽  
Planar Phase ◽  
Poor Solvent

Curing behaviour of syndiotactic polystyrene-epoxy blends: 1. Kinetics of curing and phase separation process

2005 ◽  
Vol 54 (4) ◽  
pp. 667-672 ◽  
Author(s):  
Nicolas Salmon ◽  
V�ronique Carlier ◽  
Jaap Schut ◽  
Pedro M Remiro ◽  
I?aki Mondragon
Keyword(s):  
Phase Separation ◽  
Separation Process ◽  
Syndiotactic Polystyrene ◽  
Phase Separation Process ◽  
Epoxy Blends ◽  
Kinetics Of

scholarly journals Morphology Control and Metallization of Porous Polymers Synthesized by Michael Addition Reactions of a Multi-Functional Acrylamide with a Diamine

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 800
Author(s):  
Naofumi Naga ◽  
Minako Ito ◽  
Aya Mezaki ◽  
Hao-Chun Tang ◽  
Tso-Fu Mark Chang ◽  
...  
Keyword(s):  
Phase Separation ◽  
Michael Addition ◽  
Phenylboronic Acid ◽  
Monomer Concentration ◽  
Coupling Reaction ◽  
Porous Polymer ◽  
Porous Polymers ◽  
Cross Coupling Reaction ◽  
Internal Phase ◽  
Polymerization Induced Phase Separation

Porous polymers have been synthesized by an aza-Michael addition reaction of a multi-functional acrylamide, N,N′,N″,N‴-tetraacryloyltriethylenetetramine (AM4), and hexamethylene diamine (HDA) in H2O without catalyst. Reaction conditions, such as monomer concentration and reaction temperature, affected the morphology of the resulting porous structures. Connected spheres, co-continuous monolithic structures and/or isolated holes were observed on the surface of the porous polymers. These structures were formed by polymerization-induced phase separation via spinodal decomposition or highly internal phase separation. The obtained porous polymers were soft and flexible and not breakable by compression. The porous polymers adsorbed various solvents. An AM4-HDA porous polymer could be plated by Ni using an electroless plating process via catalyzation by palladium (II) acetylacetonate following reduction of Ni ions in a plating solution. The intermediate Pd-catalyzed porous polymer promoted the Suzuki-Miyaura cross coupling reaction of 4-bromoanisole and phenylboronic acid.

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

Phase separation in sol gel-derived ceramic films of silica-zirconia, alumina-zirconia, and titania-zirconia system

1994 ◽  
Vol 52 ◽  
pp. 646-647
Author(s):  
J. Tong ◽  
L. Eyring
Keyword(s):  
Fracture Toughness ◽  
Phase Separation ◽  
Sol Gel ◽  
Great Influence ◽  
High Strength ◽  
Chemical Durability ◽  
Separation Method ◽  
Toughening Mechanism ◽  
Ceramic Films ◽  
Zirconia Toughened Alumina

There is increasing interest in composites containing zirconia because of their high strength, fracture toughness, and its great influence on the chemical durability in glass. For the zirconia-silica system, monolithic glasses, fibers and coatings have been obtained. There is currently a great interest in designing zirconia-toughened alumina including exploration of the processing methods and the toughening mechanism.The possibility of forming nanocrystal composites by a phase separation method has been investigated in three systems: zirconia-alumina, zirconia-silica and zirconia-titania using HREM. The morphological observations initially suggest that the formation of nanocrystal composites by a phase separation method is possible in the zirconia-alumina and zirconia-silica systems, but impossible in the zirconia-titania system. The separation-produced grain size in silica-zirconia system is around 5 nm and is more uniform than that in the alumina-zirconia system in which the sizes of the small polyhedron grains are around 10 nm. In the titania-zirconia system, there is no obvious separation as was observed in die alumina-zirconia and silica-zirconia system.

Phase separation in fluid additive hard sphere mixtures?

1998 ◽  
Vol 95 (2) ◽  
pp. 131-135 ◽  
Author(s):  
DOUGLAS HENDERSON DEZSO BODA KWONG-YU CHAN
Keyword(s):  
Phase Separation ◽  
Hard Sphere

The plant response to heat requires phase separation

Nature ◽  
2020 ◽  
Vol 585 (7824) ◽  
pp. 191-192 ◽  
Author(s):  
Simon Alberti
Keyword(s):  
Phase Separation ◽  
Plant Response
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