molecular relaxation

molecular relaxation

[mə′lek·yə·lər ‚rē‚lak′sā·shən]
(physical chemistry)
Transition of a molecule from an excited energy level to another excited level of lower energy or to the ground state.
References in periodicals archive ?
This is because of the molecular relaxation occurred at relatively high pretreatment temperature.
This complicated phenomenon is one of the motivations for starting this study, to investigate molecular relaxation changes occurring in a polymer during weathering as an explanation to supplement chemical degradation for these observations.
g] when a reaction or molecular relaxation is going on and separates decomposition from crosslinking.
Molded EPS patterns shrink with time due to molecular relaxation of the stresses in the cell walls and equilibration of the gas composition in each cell with the surrounding air," according to the authors.
Relatively fast molecular relaxation in the melt or solution state hinders orientation of macromolecules by adopting the entropically favorable random coil conformation.
Work in this paper explores the effect of temperature of the weathering environment, and how it affects the polymer molecular relaxation.
Shrinkage results from the gas composition in each cell coming into equilibrium with the surrounding air and from molecular relaxation.
In the glassy state the molecular relaxation engages cooperative movements in larger scales than the liquid-like state [13].
This was considered to be due to molecular relaxation occurring which reduces the orientation for subsequent crystallization.
4a obtained in dry PA66 show at least three well-identified molecular relaxation processes, namely [gamma], [beta], and [alpha] (in order of increasing temperature) (28-30).
The shear-thinning at the low frequency region can be assigned to the molecular relaxation at the crystalline interfaces and is related to the double melt peak phenomenon of PEEK.

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