These linkages serve to increase flexibility and reduce the glass transition
This rapid change in modulus is associated with a very important phenomenon that all polymers exhibit, called the glass transition
. This transition is a relaxation that involves the amorphous portion of the material.
As a model case, they focused on glass transition
temperature, an index of heat resistance.
KUWAIT, Aug 27 (KUNA) -- The Kuwait Institute for Scientific Research (KISR) has registered an unprecedented patent for measurement of glass transition
temperatures of polymers.
With its high glass transition
temperature and high crystallinity, the mechanical performance and the heat-aging performance of ForTii Ace are superior to rival polyphthalamides based on polyamides 6T, 9T and 10T.
The ink composition includes a mono-functional monomer having a glass transition
point of -30[degrees]C or lower, and a polyfunctional monomer having a glass transition
point of 0[degrees]C or lower.
They cover density, thermal properties, and the glass transition
temperature of glasses; infrared spectroscopy; Raman spectroscopy; Brillouin light scattering; neutron diffraction techniques for structural studies; X-ray diffraction from glass; X-ray absorption fine structure (SAFS) spectroscopy and glass structure; nuclear magnetic resonance spectroscopy; advanced dipolar solid-state nuclear magnetic resonance spectroscopy; and atom probe tomography.
More specifically, chemists and physicists have struggled to describe key aspects of the glass transition
, such as the concept of molecular "cages" that form as the temperature drops and the surface begins to harden.
However their low thermal stability (low glass transition
temperature) or their tendency to crystallize prevent their use in OLED products.
In a certain temperature range, this change reaches the maximum, the storage modulus decreases rapidly, and this temperature range is the glass transition
The thermal expansion was obtained over a range of 30[degrees] to 210[degrees]C, while the glass transition
temperature ([T.sub.g]) was determined by the differential thermogravimetric analysis (Setaram instrumentation Labsys DTA/6) at heating rate of 20 K [min.sup.-1].
Chemists and physicists who specialize in glass present a range of modern theoretical and experimental views of the glass transition
and relaxations in glassy systems, phenomena that have perplexed scientists, artisans, and artists since ancient times.