Thermal characterization of the mode of phase transition in the dioctadecyldimethylammonium bromide-water system in relation to the stability of its gel phase

1990 ◽  
Vol 94 (4) ◽  
pp. 1550-1554 ◽  
Author(s):  
Michiko. Kodama ◽  
Toyoki. Kunitake ◽  
Syuzo. Seki
Keyword(s):  
Phase Transition ◽  
Water System ◽  
Thermal Characterization ◽  
Gel Phase ◽  
The Stability ◽  
Dioctadecyldimethylammonium Bromide

Designing Stability into Thermally Reactive Plumbylenes

2018 ◽  
Author(s):  
Goran Bacic ◽  
David Zanders ◽  
Anjana Devi ◽  
Sean Barry
Keyword(s):  
Structural Analysis ◽  
Vapour Pressure ◽  
Room Temperature ◽  
Vapour Deposition ◽  
Thermal Characterization ◽  
Oxidative Cleavage ◽  
High Yield ◽  
Thermal Window ◽  
The Stability

We complete the picture of thermally stable and volatile <i>N-</i>heterocyclic metallylenes with the synthesis, structural analysis, and thermal characterization of <i>rac</i>-<i>N</i><sup>2</sup>,<i>N</i><sup>3</sup>-di-<i>tert</i>-butylbutane-2,3-diamido lead(II) (<b>1Pb</b>). Transamination of bis[bis(trimethylsilyl)amido] lead(II) with the free diamino ligand yields <b>1Pb</b> in high yield, whereas salt-metathesis leads to oxidative cleavage of the butane backbone and production of acetaldehyde-<i>tert-</i>butylimine. <b>1Pb</b> itself undergoes [2+2+1] cycloreversion at 150 °C to the same imine, but with a vapour pressure of 1 Torr at 94 °C a wide thermal window is available for use as a vapour deposition precursor.<div><br></div><div>We contrast this with the the extreme instability of its sisters <i>N</i><sup>2</sup>,<i>N</i><sup>3</sup>-di-<i>tert</i>-butylethane-2,3-diamido lead(II) (<b>2Pb</b>) and <i>N</i><sup>2</sup>,<i>N</i><sup>3</sup>-di-<i>tert</i>-butylethylene-2,3-diamido lead(II) (<b>3Pb</b>), which both reductively eliminate Pb(0) at or below room temperature. This is also in start contrast to the stability of the lighter Si, Ge and Sn congeners.</div>

scholarly journals Design, Preparation and Thermal Characterization of Polystyrene Composites Reinforced with Novel Three-Cages POSS Molecules

Molecules ◽  
2020 ◽  
Vol 25 (13) ◽  
pp. 2967
Author(s):  
Ignazio Blanco ◽  
Francesco Agatino Bottino ◽  
Gianluca Cicala ◽  
Giulia Ognibene ◽  
Claudio Tosto
Keyword(s):  
1H Nmr Spectroscopy ◽  
In Situ Polymerization ◽  
Thermal Characterization ◽  
Scanning Calorimetry ◽  
Single Cage ◽  
The Stability ◽  
First Time ◽  
Thermal Stability Of

Novel polystyrene (PS)/polyhedral oligomeric silsequioxanes (POSSs) nanocomposites were designed and prepared by in situ polymerization, using, for the first time, three-cage POSS molecules. The synthesized compounds were first characterized by Fourier transform infrared spectroscopy (FTIR) and 1H NMR spectroscopy to verify the obtaining of the designed products before their thermal performance was evaluated and compared with those of pristine PS and the corresponding single-cage POSSs nanocomposites. The thermal behaviour was checked by the means of the differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) was also used to confirm the hypothesis about the dispersion/aggregation of the POSS molecules into the polymer matrix. The parameters chosen to evaluate the thermal stability of the investigated compounds, namely temperature at 5% of mass loss (T5%) and solid residue at 700 °C, showed a significant increase in the stability of the polymers reinforced with the three-cages POSS, in comparison to both PS and single-cage POSS reinforced PSs, which therefore turn out to be promising molecular fillers for nanocomposite production.

Structural and thermal characterization of dioctadecyldimethylammonium bromide dispersions by spin labels

2001 ◽  
Vol 111 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Carlos R. Benatti ◽  
Eloi Feitosa ◽  
Roberto M. Fernandez ◽  
M.Teresa Lamy-Freund
Keyword(s):  
Thermal Characterization ◽  
Spin Labels ◽  
Dioctadecyldimethylammonium Bromide

Rheological Measurements and Thermal Characterization of Lamellar Gel Phase Emulsions Developed with Cetearyl Alcohol/Nonionic Ethoxylated Surfactants

2012 ◽  
Vol 33 (11) ◽  
pp. 1621-1628 ◽  
Author(s):  
Paula S. Prestes ◽  
Fabiana A. S. M. Soares ◽  
Adriano M. Oliveira ◽  
Elizabeth P. G. Arêas ◽  
Luiz A. Gioielli ◽  
...  
Keyword(s):  
Thermal Characterization ◽  
Rheological Measurements ◽  
Ethoxylated Surfactants ◽  
Gel Phase

Thermal characterization of starch–water system by photopyroelectric technique and adiabatic scanning calorimetry

2003 ◽  
Vol 74 (1) ◽  
pp. 818-821 ◽  
Author(s):  
A. Cruz-Orea ◽  
E. H. Bentefour ◽  
P. Jamée ◽  
M. Chirtoc ◽  
C. Glorieux ◽  
...  
Keyword(s):  
Water System ◽  
Thermal Characterization ◽  
Photopyroelectric Technique ◽  
Scanning Calorimetry ◽  
Adiabatic Scanning Calorimetry

Designing Stability into Thermally Reactive Plumbylenes

2018 ◽  
Author(s):  
Goran Bacic ◽  
David Zanders ◽  
Anjana Devi ◽  
Sean Barry
Keyword(s):  
Structural Analysis ◽  
Vapour Pressure ◽  
Room Temperature ◽  
Vapour Deposition ◽  
Thermal Characterization ◽  
Oxidative Cleavage ◽  
High Yield ◽  
Thermal Window ◽  
The Stability

We complete the picture of thermally stable and volatile <i>N-</i>heterocyclic metallylenes with the synthesis, structural analysis, and thermal characterization of <i>rac</i>-<i>N</i><sup>2</sup>,<i>N</i><sup>3</sup>-di-<i>tert</i>-butylbutane-2,3-diamido lead(II) (<b>1Pb</b>). Transamination of bis[bis(trimethylsilyl)amido] lead(II) with the free diamino ligand yields <b>1Pb</b> in high yield, whereas salt-metathesis leads to oxidative cleavage of the butane backbone and production of acetaldehyde-<i>tert-</i>butylimine. <b>1Pb</b> itself undergoes [2+2+1] cycloreversion at 150 °C to the same imine, but with a vapour pressure of 1 Torr at 94 °C a wide thermal window is available for use as a vapour deposition precursor.<div><br></div><div>We contrast this with the the extreme instability of its sisters <i>N</i><sup>2</sup>,<i>N</i><sup>3</sup>-di-<i>tert</i>-butylethane-2,3-diamido lead(II) (<b>2Pb</b>) and <i>N</i><sup>2</sup>,<i>N</i><sup>3</sup>-di-<i>tert</i>-butylethylene-2,3-diamido lead(II) (<b>3Pb</b>), which both reductively eliminate Pb(0) at or below room temperature. This is also in start contrast to the stability of the lighter Si, Ge and Sn congeners.</div>

Effect of intrinsic and extrinsic factors on the stability of the α-gel phase of a glyceryl monostearate–water system

RSC Advances ◽  
2015 ◽  
Vol 5 (54) ◽  
pp. 43121-43129 ◽  
Author(s):  
Fan C. Wang ◽  
Alejandro G. Marangoni
Keyword(s):  
Water System ◽  
Glyceryl Monostearate ◽  
Extrinsic Factors ◽  
System P ◽  
Gel Phase ◽  
The Stability ◽  
Intrinsic And Extrinsic Factors

The α-gel phase of glycerlyl monostearate was stabilized by using specific co-surfactants, by setting slowly from the Lα phase and by avoiding shear.

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