Kinetics of Grafted Chains in Polymer Brushes

1993 ◽  
pp. 70-84 ◽  
Author(s):  
Z. Gao ◽  
H. D. Ou-Yang
Keyword(s):  
Polymer Brushes ◽  
Kinetics Of

Kinetics of the formation and structure of oligoperoxide nanolayers and grafted polymer brushes on glass plate surface

Open Physics ◽  
2008 ◽  
Vol 6 (3) ◽  
Author(s):  
Andriy Kostruba ◽  
Alexander Zaichenko ◽  
Natalya Mitina ◽  
Kateryna Rayevska ◽  
Kateryna Hertsyk
Keyword(s):  
Polymer Brushes ◽  
Graft Polymerization ◽  
Glass Plate ◽  
Flat Plates ◽  
Hydrophobic Properties ◽  
Surface Protection ◽  
Grafted Polymer ◽  
Coating Formation ◽  
Modified Surface ◽  
Kinetics Of

AbstractFunctional oligoperoxide surfactants and coordinating oligoperoxide metal complexes were studied as modifiers of glass flat plates to provide the localization of radical forming sites and other functional fragments in adsorbed polymeric layers of a nanoscale thickness. Both the kinetics of the coating formation and properties of the nanolayers witness the dependence of the packing density of oligoperoxide molecules in the coatings on the oligoperoxide natures, concentrations and conditions of the sorption modification. The availability of definite amount of peroxide groups in formed nanolayer provides the possibility of controlled radical graft polymerization initiated from modified surface leading to reliable surface protection, functionality and targeted surface hydrophilic-hydrophobic properties.

Probing the Intrinsic Switching Kinetics of Ultrathin Thermoresponsive Polymer Brushes

2011 ◽  
Vol 50 (19) ◽  
pp. 4513-4516 ◽  
Author(s):  
Crispin Amiri Naini ◽  
Steffen Franzka ◽  
Sven Frost ◽  
Mathias Ulbricht ◽  
Nils Hartmann
Keyword(s):  
Polymer Brushes ◽  
Thermoresponsive Polymer ◽  
Kinetics Of

Back Cover: Probing the Intrinsic Switching Kinetics of Ultrathin Thermoresponsive Polymer Brushes (Angew. Chem. Int. Ed. 19/2011)

2011 ◽  
Vol 50 (19) ◽  
pp. 4238-4238
Author(s):  
Crispin Amiri Naini ◽  
Steffen Franzka ◽  
Sven Frost ◽  
Mathias Ulbricht ◽  
Nils Hartmann
Keyword(s):  
Polymer Brushes ◽  
Thermoresponsive Polymer ◽  
Back Cover ◽  
Kinetics Of

Thiol-Lactam Initiated Radical Polymerization (TLIRP): Scope and Application for the Surface Functionalization of Nanoparticles

2021 ◽  
Vol 18 ◽  
Author(s):  
Farzad Seidi ◽  
Mohammad Reza Saeb ◽  
Yongcan Jin ◽  
Philippe Zinck ◽  
Huining Xiao
Keyword(s):  
Radical Polymerization ◽  
Hybrid Materials ◽  
Surface Functionalization ◽  
Polymer Brushes ◽  
Controlled Polymerization ◽  
Molecular Weights ◽  
Straightforward Method ◽  
Mechanism And Kinetics ◽  
Grafting From ◽  
Kinetics Of

: Controlled polymerization techniques make possible fabrication of polymers with desired molecular weights, narrow dispersity, and also tailor-making of advanced hybrid materials. Thiol-Lactam Initiated Radical Polymerization (TLIRP) was introduced in 2002 and developed during the last two decades. The thiol/lactam combination enables one to generate radicals that can initiate the polymerization of vinyl-based monomers. The study of the mechanism and kinetics of TLIRP revealed the characteristics of living polymerization for TLIRP. Moreover, TLIRP has been used successfully for the synthesis of homopolymers, block copolymers, and statistical copolymers with polydispersity below 2.0. Especially, TLIRP provides a very straightforward method for grafting polymer brushes on the surface of nanoparticles. We review herein the systems developed for TLIRP and their applications for macromolecular engineering, with an emphasis on the surface functionalization of nanoparticles via the grafting-from approach.

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

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