The supercooling ability of calcium nitrate solutions in ethylene glycol

1989 ◽  
Vol 54 (10) ◽  
pp. 2711-2714
Author(s):  
Ivo Sláma ◽  
Jarmila Malá
Keyword(s):  
Thermal Stability ◽  
Ethylene Glycol ◽  
Induction Period ◽  
Calcium Nitrate ◽  
Transformation Diagram ◽  
Temperature Transformation ◽  
Thermal Stability Of ◽  
Nitrate Solutions

The dependence of the induction period of crystallization on the supercooling was determined for the Ca(NO3)2-ethylene glycol system at mole fractions of the former from 0 to 0.049, and treated in terms of the TTT (Time-Temperature-Transformation) diagram. Addition of Ca(NO3)2 to ethylene glycol brings about a substantial increase in the critical induction period of crystallization. The thermal stability of glasses is discussed in terms of the shape and position of the TTT curves.

Induction period of crystallization of zinc chloride solutions in ethylene glycol

1990 ◽  
Vol 55 (10) ◽  
pp. 2428-2431 ◽  
Author(s):  
Ivo Sláma ◽  
Jarmila Malá
Keyword(s):  
Thermal Stability ◽  
Ethylene Glycol ◽  
Induction Period ◽  
Zinc Chloride ◽  
Supercooled Liquids ◽  
Chloride Solutions ◽  
Transformation Diagram ◽  
Temperature Transformation ◽  
Thermal Stability Of

The dependence of the induction period of crystallization on the supercooling was examined for the ZnCl2-ethylene glycol system at mole fractions of the salt from 0 to 0.07, and treated in terms of the TTT (Time-Temperature-Transformation) diagram. The critical induction period of crystallization increases substantially on the addition of ZnCl2 to ethylene glycol. The thermal stability of supercooled liquids is discussed in terms of the shape and position of the TTT curves.

Induction period of the crystallization of silver nitrate solutions in ethylene glycol

1991 ◽  
Vol 56 (10) ◽  
pp. 2142-2147
Author(s):  
Ivo Sláma
Keyword(s):  
Ethylene Glycol ◽  
Silver Nitrate ◽  
Induction Period ◽  
Glass Forming Ability ◽  
Transformation Theory ◽  
Concentration Region ◽  
Glass Forming ◽  
Temperature Transformation ◽  
Silver Nitrate Solutions ◽  
Nitrate Solutions

The dependence of the induction period of crystallization on supercooling was examined for the silver nitrate-ethylene glycol system over the concentration region of silver nitrate lome fraction of 0 to 0.12. Addition of AgNO3 to ethylene glycol was found to increase considerably the critical induction period of crystallization, although to a lesser extent than Ca(NO3)2, CaCl2, ZnCl2, LiCl and LiNO3 do. The effect of these salts on the critical induction period of crystallization in dimethylsulfoxide, dimethylformamide, dimethylacetamide and methanol was compared in terms of the solvent-rich composition limit of the glass-forming ability. By using the TTT(Time-Temperature-Transformation) theory, it has been deduced that the effect of the salts on the critical induction period of crystallization of ethylene glycol is probably due to the different dependences of viscosity on their concentration in ethylene glyco in the supercooling region.

scholarly journals Sizing and Thermal Stability of Prepared Tetraaminophthalocyaninatocopper(II) Derivatives-grafted Polymers

2016 ◽  
Vol 13 (2) ◽  
pp. 221-234
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thermal Stability ◽  
Ethylene Glycol ◽  
Group Analysis ◽  
Condensation Polymerization ◽  
Grafted Polymers ◽  
Poly Ethylene Glycol ◽  
Molecular Weights ◽  
Poly Ethylene ◽  
Thermal Stability Of ◽  
End Group

Different polymers were prepared by condensation polymerization of sebacic anhydride and adipic anhydride with ethylene glycol and poly(ethylene glycol). Their number average molecular weights were determined by end group analysis. Then, they were grafted on the prepared phthalocyaninatocopper(II) compounds with the general formula (NH2)4PcCu(II) having amino groups of 3,3',3'',3'''- or 4,4',4'',4'''- positions. All prepared polymers, compounds, and phthalocyaninatocopper(II)-grafted polymers were characterized by FTIR. The sizing measurements were carried out in 3,3',3'',3'''- (NH2)4PcCu(II) and 4,4',4'',4'''- (NH2)4PcCu(II) compounds with and without grafting polymers. The results showed that the grafting process led to decreasing in particle size and increasing in surface area. The grafting process was reflected positively on the thermal degradation of 3,3',3'',3'''- (NH2)4PcCu(II) and 4,4',4'',4'''- (NH2)4PcCu(II) grafted polymers. They had higher thermal stability accompanied with higher char residue and T50% weight loss with 3,3',3'',3'''-(NH2)4PcCu(II) and their grafted polymers being the best.

Thermal stability of glass evaluated by the induction period of crystallization

2005 ◽  
Vol 428 (1-2) ◽  
pp. 11-14 ◽  
Author(s):  
P. Šimon ◽  
K. Nemčeková ◽  
E. Jóna ◽  
A. Plško ◽  
D. Ondrušová
Keyword(s):  
Thermal Stability ◽  
Induction Period ◽  
Thermal Stability Of

scholarly journals The Role of Sulfur in the Thermal Stability of Jet Fuel

1999 ◽  
Author(s):  
David W. Naegeli
Keyword(s):  
Thermal Stability ◽  
Induction Period ◽  
Jet Fuel ◽  
Sulfur Compounds ◽  
Inhibition Mechanism ◽  
Organic Base ◽  
Oxidation Inhibitor ◽  
Acid Catalyzed ◽  
Thermal Stability Of

The autoxidation of Jet A, dodecane, and a dodecane-15%-cumene blend doped with sulfur compounds were studied at 433 K. Oxygen, hydro peroxide and soluble gum were monitored during the autoxidation. Dodecane, cumene, and the dodecane-15%-cumene blend autoxidized rapidly, while Jet A had an induction period followed by a relatively slow post autoxidation. The results suggest that an inhibitor formed early in the post autoxidation of Jet A. Gum formed in the autoxidation of Jet A, whereas none was detected in dodecane, cumene, or dodecane-15% cumene. However, gum was detected in dodecane and dodecane-15% cumene doped with thiols and disulfides. Alkyl thiols and disulfides reduced the rate of autoxidation of dodecane, and there was an induction period in the formation of gum. Traces of sulfur (≈4 ppm) inhibited the autoxidation of dodecane-15% cumene in a way that resembled the post autoxidation of Jet A. Adding an organic base increased the rate of post autoxidation in Jet A and prevented formation of the oxidation inhibitor. An inhibition mechanism is proposed in which phenois are formed via acid-catalyzed decomposition of benzylic hydro peroxides.

scholarly journals Thermal Stability of Collagen Fibers in Ethylene Glycol

2001 ◽  
Vol 80 (3) ◽  
pp. 1480-1486 ◽  
Author(s):  
C.A. Miles ◽  
T.V. Burjanadze
Keyword(s):  
Thermal Stability ◽  
Ethylene Glycol ◽  
Collagen Fibers ◽  
Thermal Stability Of

Comparison study on the effect of acid and nitrate salt on the properties of poly(vinyl alcohol) coating doped with dye consist of anthocyanin

2015 ◽  
Vol 44 (4) ◽  
pp. 250-256
Author(s):  
S.V. Lee ◽  
R. Usop ◽  
A.N. Hadi ◽  
N.A. Mazni ◽  
S.R. Majid ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hydrochloric Acid ◽  
Calcium Nitrate ◽  
Natural Dye ◽  
Poly Vinyl Alcohol ◽  
Nitrate Salt ◽  
Comparison Study ◽  
Coating Films ◽  
Content Type ◽  
Thermal Stability Of

Purpose – The purpose of this paper is to observe the thermal and colour stabilities of coating films consisting of natural dye anthocyanin colourant with acid and nitrate salt as additives. Design/methodology/approach – The natural dye was extracted from Hibiscus sabdariffa L. (Roselle) by using distilled water as solvent. The extracted dye was mixed with 1 weight per cent hydrochloric acid and 5 weight per cent calcium nitrate to conduct the comparison study. The dye samples were than mixed with poly (vinyl alcohol) (PVA). The mixtures were applied on glass panels to form coating films. The coating films were left to dry for 24 hours. The thermal stability of coating films was investigated by using thermogravimetric analysis (TGA). The amorphousness coating films molecular structures were observed by using x-ray diffraction (XRD). CIE L*a*b* colour coordinate space technique was used to investigate the coating films colour stability against ultraviolet (UV). Findings – The results show that addition of hydrochloric acid (HCl acid) enhanced thermal stability of PVA-anthocyanin coating and shifted the degradation temperature to higher temperature at 300°C. HCl acid also improved UV stability of the coating system significantly with the reduced ΔE from 26.67 to 16.89. Addition of calcium nitrate (Ca(NO3)2) salt promotes good interaction with PVA-anthocyanin system that caused structural changes, improved thermal stability and increased Tg from 61.5 to 83.1°C. Research limitations/implications – The potential of using natural dye extracted from plant as renewable material. Practical implications – The coating films developed in this works are suitable for glass substrate application. Originality/value – Development of water-based coating from PVA binder with anthocyanin colourant is introduced in this study.

Structure, Wettability, and Thermal Stability of Organic Thin-Films on Gold Generated from the Molecular Self-Assembly of Unsymmetrical Oligo(ethylene glycol) Spiroalkanedithiols

Langmuir ◽  
2017 ◽  
Vol 33 (8) ◽  
pp. 1751-1762 ◽  
Author(s):  
Pawilai Chinwangso ◽  
Han Ju Lee ◽  
Andrew C. Jamison ◽  
Maria D. Marquez ◽  
Chul Soon Park ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Ethylene Glycol ◽  
Self Assembly ◽  
Organic Thin Films ◽  
Thermal Stability Of
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