Glass transition. Medical search. Frequent questions

The glass-liquid transition, or glass transition, is the gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a viscous or rubbery state as the temperature is increased. (wikipedia.org)
The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs (as an experimental definition, typically marked as 100 s of relaxation time). (wikipedia.org)
However, the glass transition is generally not regarded as a thermodynamic transition in view of the inherent difficulty in reaching equilibrium in a polymer glass or in a polymer melt at temperatures close to the glass-transition temperature. (wikipedia.org)
In the case of polymers, conformational changes of segments, typically consisting of 10-20 main-chain atoms, become infinitely slow below the glass transition temperature. (wikipedia.org)
The transition comprises a smooth increase in the viscosity of a material by as much as 17 orders of magnitude within a temperature range of 500 K without any pronounced change in material structure. (wikipedia.org)
In many materials that normally undergo a freezing transition, rapid cooling will avoid this phase transition and instead result in a glass transition at some lower temperature. (wikipedia.org)
Below the transition temperature range, the glassy structure does not relax in accordance with the cooling rate used. (wikipedia.org)
Similarly, by annealing (and thus allowing for slow structural relaxation) the glass structure in time approaches an equilibrium density corresponding to the supercooled liquid at this same temperature. (wikipedia.org)
Usually referred by the glass transition temperature of a material instead. (everything2.com)
Tests were performed for times long enough to attain the equilibrium viscoelastic response at temperatures from approximately T g -17[degrees]C to T g +3[degrees]C where T g is the nominal glass transition temperature. (nist.gov)
What is POLYSORB® isosorbide impact on polymer glass transition temperature (Tg)? (roquette.com)
What can be done to increase the glass transition temperature (Tg) of polyethylene terephthalate (PET)? (roquette.com)
Surprisingly, at low fields the glass transition separates between a low-temperature Bragg glass and a thermally depinned variant of it - possibly a perfect lattice. (aps.org)
At lower temperatures, on approaching the glass transition, the temperature dependence of the bulk resistance becomes much sharper. (aps.org)
1.1 These test methods describe the assignment of the glass transition temperature of materials using modulated temperature differential scanning calorimetry (MTDSC) over the temperature range from -120 °C to +600 °C. The temperature range may be extended depending upon the instrumentation used. (astm.org)
That's why decisions about polymer performance almost always include the calculation of glass transition temperature, or Tg - because Tg helps end users anticipate how a latex polymer will behave at its service temperature. (mcpolymers.com)
When crystalline polymers are heated and reach a certain temperature, the orderly arrangement of their long chain structure transitions to a random and disorganized arrangement. (mcpolymers.com)
The point of this change is known as the glass transition temperature (Tg). (mcpolymers.com)
Such polymers would have both a melting point and a glass transition temperature. (mcpolymers.com)
The glass transition temperature of these polymers typically ranges from -80°C to +100°C. The Tg can be manipulated by varying the polymer composition. (mcpolymers.com)
Latex-based paints typically have glass transition temperatures between 10° to 20°C (50° and 70°F). When they are applied within this temperature range, they form a superior film, have good adhesion and don't show any surface defects. (mcpolymers.com)
Furthermore, we also observed an increase in the glass transition temperature (T g ) of the. (lu.se)
Furthermore, we also observed an increase in the glass transition temperature (T g ) of the mixtures with increasing lysozyme concentration. (lu.se)
The glass transition temperature is the temperature at which an amorphous polymer changes from a hard glassy form into a rubberlike elastic form or to a viscous fluid. (ncsu.edu)
At this glass transition, which is a secondary transition, the temperature derivatives of both physical and mechanical properties of the polymer change. (ncsu.edu)
Poly(Bisphenol A-co-epichlorohydrin), glycidyl endcapped (DGEBA), with average molecular weight ~380 g/mol, corresponding to n = 0.14 in the chemical formula Figure 1 , and glass transition temperature 255 ± 1 K was purchased from Shell Co. under the trade name of Epon 828. (scirp.org)
These results rationalize the Temperature of Glass transition phase of polyketone-based polymers PK50: PK50BEA, PK50HAMC, PK50HEXYL, and PK50IM. (mendeley.com)
For the DSC the heating rate of the analysis was 10°C/min and the glass transition temperature was determined from the inflextion of the curves using the TRIOS software. (mendeley.com)
Recent studies have illustrated a decoupling between cooperative segmental mobility and the glass transition temperature (T g ) of thin polymer films and nanocomposites. (princeton.edu)
When a glass is heated up to its specific transition temperature , its components acquire additional mobility, and the material becomes a supercooled liquid. (azoquantum.com)
Which of the two prevails is dictated by the specific temperature of the glass but does not depend on the procedure used to form the original glass or on its initial stability. (azoquantum.com)
This study -whose co-authors are Ana Vila-Costa, Dr Cristian Rodríguez-Tinoco and Marta Rodríguez-López- was made possible by the use of advanced laboratory techniques, such as nanocalorimetry, which allows observing glass dynamics at the nanoscale and performing measurements at temperature ranges and time scales that cannot be achieved by conventional methods. (azoquantum.com)
We further show that the glassy state cannot be described in terms of a mixture of equilibrium liquid states, indicating that there is no microscopic basis for the concept of a fictive temperature distribution and that the glass and liquid are two fundamentally different states. (psu.edu)
The flexibility is a result of a very low glass transition temperature (Tg). (uvebtech.com)
In the next edition of Professor's Corner , Part 2 of this discussion of glass transition temperature will provide information about various key methods used to measure the Tg of polymers, including dilatometry, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). (uvebtech.com)
However, the ideal temperature for heat application depends on the thermal behavior of each material, such as glass transition (T g ) and initial degradation temperatures. (bvsalud.org)
Mapping positron annihilation lifetime spectroscopy data of a polymer to classical molecular dynamics simulations without shifting the glass transition temperature. (bvsalud.org)

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Hard plastics like polystyrene and poly(methyl methacrylate) are used well below their glass transition temperatures, i.e., when they are in their glassy state. (wikipedia.org)
This mobility increase may lead to kinetic events such as enthalpic recovery, chemical reaction or crystallization at temperatures near the glass transition. (astm.org)
The glass transition temperatures were obtained from thermogravimetric analysis. (mendeley.com)
Biaxial stretching test was conducted to obtain the mechanical properties of amorphous PLLA materials at temperatures above glass transition. (hud.ac.uk)
A systematic prescription is given for estimating the phase transition temperatures in advance, which facilitates the choice of optimal parameters. (lu.se)

This transition is in contrast to the freezing or crystallization transition, which is a first-order phase transition in the Ehrenfest classification and involves discontinuities in thermodynamic and dynamic properties such as volume, energy, and viscosity. (wikipedia.org)
It is important to note that only the amorphous domains in a polymer sample will exhibit a Tg, a secondary thermodynamic phase transition. (uvebtech.com)

Phenomena occurring at the glass transition of polymers are still subject to ongoing scientific investigation and debate. (wikipedia.org)
Other materials, such as many polymers, lack a well defined crystalline state and easily form glasses, even upon very slow cooling or compression. (wikipedia.org)
Still, the behavior of glass can be useful in understanding how polymers work. (mcpolymers.com)
As the changes to these polymers are gradual, by convention, the Tg is reported as the midpoint of this transition. (mcpolymers.com)
This dataset contains theoretical data on the study of glass transition phase of five polyketone-based polymers. (mendeley.com)

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This deviation from a simple Arrhenius behavior tracks the glass line, and may signify criticality. (aps.org)
Preliminary measurements show that spin-lattice relaxation rate 1/$T_{1}$ demonstrates a classic Korringa behavior 1/$T_{1\, }$\textasciitilde $T$ above the superconducting transition $T_{c}$ , consistent with previous measurements on this compound. (aps.org)
Sorption calorimetry experiments demonstrate that the hydration behavior of this formulation is similar to that of the pure amorphous sucrose, while the presence of lysozyme only shifts the sucrose transitions. (lu.se)
In this paper, we review recent advances in the modeling of glass transition range behavior based on the enthalpy landscape approach. (psu.edu)
When combined with these new computational techniques, the enthalpy landscape approach can provide for the predictive modeling of glass transition and relaxation behavior on a laboratory time scale. (psu.edu)

The reverse transition, achieved by supercooling a viscous liquid into the glass state, is called vitrification. (wikipedia.org)

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An amorphous solid that exhibits a glass transition is called a glass. (wikipedia.org)
As an interesting side note, glass is an amorphous material, but it's not a polymer - it's a non-polymeric amorphous solid. (mcpolymers.com)
A glass is an amorphous solid, a state of matter characterised by the absence of a long-range order. (azoquantum.com)

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This means that regions of the glass having slightly higher mobility induce adjacent zones to progressively transit to a liquid state and reach an equilibrium phase. (azoquantum.com)
Responsive Hydrogel Colloids: Structure, Interactions, Phase Behaviour and Equilibrium and Non-equilibrium Transitions of Microgel Dispersions. (lu.se)
These diverse materials may exhibit time-dependent structures under transient or out-of-equilibrium conditions resulting from for example self-assembly processes, phase transitions or in response to external fields, such as flow. (lu.se)

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Stevens refers to this transition as the onset of long-range segmental motion and describes a "segment" as 20 to 50 chain atoms. (uvebtech.com)

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The QCD dynamics at high energies and large nuclei predicts the for- mation of a new state of matter, called Color Glass Condensate (For a review see Refs. (lu.se)

of DGEBA were measured from above to below the glass transition. (scirp.org)

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In glass former materials close to the glassy state the relaxation scenario evolves over many times decades, from very fast processes (b-processes) on the scale of nanoseconds to very slow ones (structural process) occurring on the scale of seconds, [1,2]. (scirp.org)
These processes, possibly relevant for the glass transition, are now referred to as the Johari-Goldstein (JG) secondary or JG b-relaxation to honor their discovery of secondary relaxation even in totally rigid molecules without internal degree of freedom. (scirp.org)

The implications of these results with regards to vortex-glass transition will be discussed. (aps.org)

IUPAC definition Glass transition (in polymer science): process in which a polymer melt changes on cooling to a polymer glass or a polymer glass changes on heating to a polymer melt. (wikipedia.org)

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We thus reveal a novel second-order glass transition, manifested by a sharp reversible kink in the measured local magnetization \footnote{HB, N.~Avraham, Y.~Myasoedov, H.~Shtrikman, E.~Zeldov, B.~Rosenstein, E.H.~Brandt, T.~Tamegai, \emph{Phys. (aps.org)

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In particular, this exotic transformation mechanism is behind the very high stability of vapor-deposited ultrastable glasses , including the organic ones, and may therefore have a positive impact on the durability of organic devices or the production of metallic glasses with enhanced mechanical properties for wear- and corrosion-resistant coatings. (azoquantum.com)

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Among secondary relaxations, those originated by intra-molecular transitions naturally bear no relation to the structural relaxation. (scirp.org)

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Since this state is not energetically stable, atoms or molecules in glasses tend to rearrange themselves over time, leading towards more stable configurations. (azoquantum.com)
Conventionally, this transition from glass to liquid is described as a dynamic process in which atoms or molecules go through a cooperative relaxation . (azoquantum.com)

abstract = "A fundamental understanding of the glass transition is essential for enabling future breakthroughs in glass science and technology. (psu.edu)

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The question of whether some phase transition underlies the glass transition is a matter of ongoing research. (wikipedia.org)
The microcrystalline regions, on the other hand, if present, may go through a primary phase transition similar to melting rather than just "softening. (uvebtech.com)

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Acknowledgements This work received financial support from the "Programa Formacion de Capital Humano Avanzado Conicyt Becas Chile" Grant N°2117475, ANID/FONDECYT project N° 1210355, "Proyecto FONDECYT de Iniciación en Investigación" Grant No 11201111, and ANID/FONDEQUIP EQM180180. (mendeley.com)
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5.1 Materials undergo an increase in molecular mobility at the glass transition seen as a sigmoidal step increase in the heat capacity. (astm.org)
The researchers demonstrated experimentally that, under specific conditions, the transition from glass to supercooled liquid can originate from a rapid formation of localised liquid regions, whose mobility is much higher than that of the rest of the material and which expand quickly. (azoquantum.com)
For these two states to coexist in localised regions, the difference in mobility between the liquid and the glass parts must be very significant. (azoquantum.com)

Anatomy1

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