Thermally stimulated current analyzer

Thermally stimulated current analyzer (TSC) Alternating current calorimeter (ACC) Thermoluminescence analyzer (TL)... 

As to be noticed in Fig. 5, the 5°C peak shows considerable tailing to the lower temperature region. This means the presence of some amount of shallower trapps in the polymer. As shown by Fig. 7, the thermally stimulated current from these traps becomes somewhat clearer with slower heating rate. However, the density of these traps is too small to analyze. Pai and Patora show also the presence of such kind of traps [3), (4). 

As shown in Figs. 2,5 and 7, the curves show large thermally stimulated current in higher temperature region also. It is difficult, however, to observe any maximum in this current and is impossible to analyze the trap parameters. 

Petroff and Lang (1977) combined DLTS with scanning electron microscopy in a method that allows spatial imaging of deep states in the plane of a junction. The scanned electron beam is pulsed on and off and the resulting thermally stimulated current or capacitance transient is analyzed using the usual DLTS methods. 

The purpose of the present communication is to provide experimental support for the idea that Tp (TTg) are all issued from a unique relaxation kinetics which is primary responsible for the Tg effect The suggestion that Tp is a precursor of Tg is not new 2.4 the idea that T// behaves like a classical kinetic transition, i.e., like a sort of Tg is not new eitfaer. > Frenkel in the USSR suggests that the 7 transition merges with the Tg transition on a log frequency vs. 1/7 plot at a temperature which corresponds to 7//. These observations all concur separately with our own attempt to reconcile into a unique relaxation mechanism the 7 Tg, and Tn "transitions." Atactic polystyrene is chosen here for the experimental data because the physical properties relevant to our discussion are well-documented in the literature for this particular polymer, representative of the class of amorphous polymers. Furthermore, TSC (Thermally Stimulated Current) and DSC results on rheomolded polystyrene samples can be systematically compared since the influence of the rheomolding parameters (frequency of vibration during molding, amplitude of vibration, and post treatment armealing effects) are simultaneously studied and analyzed by both techniques. " ... 

Qrou and Gultinger [486] applied the method of ionk thermal currents to a polarized electret which is discharged by the thermally stimulated discharge current technique and showed a method of calculation of dipok relaxation times and their activation energies. Perimsn and Meunkr [487], van Tumhout [488], and several others (489,490) have used it to analyze the electret effect quantitatively. 

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