Chiral Studies in Amorphous Solids:  The Effect of the Polymeric Glassy State on the Racemization Kinetics of Bridged Paddled Binaphthyls

2001 ◽  
Vol 123 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Ji-Woong Park ◽  
Mark D. Ediger ◽  
Mark M. Green
Keyword(s):  
Glassy State ◽  
Amorphous Solids ◽  
Kinetics Of

Generalized Activation Energy Spectrum Theory: A New Approach for modeling Structural Relaxation in Amorphous Solids

1993 ◽  
Vol 321 ◽  
Author(s):  
Jung H. Shin ◽  
Harry A. Atwater
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Structural Relaxation ◽  
Ad Hoc ◽  
Amorphous Solids ◽  
Nucleation Kinetics ◽  
Crystal Silicon ◽  
Time Resolved ◽  
New Approach ◽  
Kinetics Of

ABSTRACTA general approach to the dynamics of structural relaxation in amorphous solids is developed. A form of the recombination kinetics of defects is chosen which removes the ad hoc assumption made in previous theories that defects recombine only with others of identical activation energy. The generalized theory is tested quantitatively by modelling the structural relaxation of amorphous silicon, and comparing the results with the experimental data on structural relaxation. It is found that the generalized theory is necessary in order to accurately describe the time-resolved relaxation data. The generalized theory is also applied to estimate the effect of irradiation on the nucleation kinetics of crystal silicon, and is found to agree well with experimental data.

Crystallization kinetics of oriented poly (ethylene terephthalate) from the glassy state

Polymer ◽  
1978 ◽  
Vol 19 (6) ◽  
pp. 711-716 ◽  
Author(s):  
Giovanni Carlo Alfonso ◽  
Maria Pia Verdona ◽  
Andrzej Wasiak
Keyword(s):  
Crystallization Kinetics ◽  
Ethylene Terephthalate ◽  
Glassy State ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Kinetics Of

Glass Formation During Room Temperature, Isothermal Drying

2003 ◽  
Author(s):  
Alptekin Aksan ◽  
Mehmet Toner
Keyword(s):  
Glass Transition ◽  
Glassy State ◽  
Glass Transitions ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Glass Transition Kinetics ◽  
The Stability ◽  
Isothermal Drying ◽  
Kinetics Of

Isothermal drying and glass transition of solutions and films have drawn considerable attention from many industries. We here explore the feasibility of modifying the isothermal drying and vitrification kinetics of carbohydrate solutions in order to ensure the stability and quality of their ingredients. Modulated Differential Scanning Calorimetry experiments with isothermally dried trehalose and trehalose/dextran solutions were performed and the glass transition kinetics have been determined. Three distinct drying regimes were observed. With isothermal, isobaric drying at 0%RH, it was indeed possible to reach the glassy state for a trehalose and a trehalosedextran system. With the addition of high molecular weight sugars, the glass transitions of isothermally dried carbohydrate solutions can be accelerated as a function of dextran mass ratio in the sample.

Air Oxidation Kinetics Study of Zr58Nb3Cu16Ni13Al10 Bulk Metallic Glass

2009 ◽  
Vol 283-286 ◽  
pp. 209-213 ◽  
Author(s):  
Dong Ya Huang ◽  
Xiang Jin Zhao ◽  
Tao Zhang ◽  
Vincent Ji
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Oxidation Kinetics ◽  
Glassy State ◽  
Supercooled Liquid ◽  
Isothermal Oxidation ◽  
Growth Speed ◽  
Air Oxidation ◽  
Two Stages ◽  
Kinetics Of

The isothermal oxidation behavior of Zr58Nb3Cu16Ni13Al10 bulk metallic glass (BMG) under dry air in the glassy state and the supercooled liquid state (SLS) was studied by the thermogravimetric method. The oxidation rate and thickness growth speed in the SLS were both hugely higher than in the glassy state. The oxidation kinetics of BMG in both states for 1.5 hours was different, the parabolic law was followed in the glassy state at 300°C and 350°C, contrarily the linear law was followed in SLS at 400 °C. After the oxidation for 126 hours in SLS, the oxidation kinetics possessed two stages, the linear stage and the parabolic stage. The diffusion of the Cu2+ ion and CuZr intermetallic alloys were detected by GIXRD.

The Influence of Temperature on The Kinetics of Cut Growth in Vulcanizates

1959 ◽  
Vol 32 (3) ◽  
pp. 692-695 ◽  
Author(s):  
V. E. Gul ◽  
S. A. Vilnits
Keyword(s):  
High Speed ◽  
Glassy State ◽  
High Speed Photography ◽  
Influence Of Temperature ◽  
Brittle Solids ◽  
Significant Difference ◽  
Elastomeric Materials ◽  
Influence Of Temperature On ◽  
Published Research ◽  
Kinetics Of

Abstract Recently published research has conclusively demonstrated that rupture in vulcanizates represents a process which increases with time. Slow and fast stages of rupture were discerned. Through the use of high speed photography it was found that, in the usual testing of tensile strength, the rate of rupture growth is initially very small but then quickly although intermittently increases. This behavior occurred both in the rupture of specimens which were not cut and in testing specimens that had been previously cut. The effect of a cut has been thoroughly investigated. Studies conducted on the mechanism of rupture in elastomers indicate that the rupture of vulcanizates has much in common with that of brittle solids. Nevertheless there is a significant difference in the mechanism of rupture in elastomeric materials and brittle solids. It was natural, therefore, to expect a significant change in the kinetics of rupture growth in the region of the glass transition temperature. The aim of the present investigation was to follow the change in the kinetics of rupture of vulcanizates through the transition from the rubbery to the glassy state.

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