Thermo-optic analysis

Despite the apparent advantages of such a technique only very few references are found in the literature. This is surprising in view of the very large number of publications in recent years on liquid crystal polymers and of course also on low molecular weight liquid crystals. We wish here to illustrate this thermo-optical analysis (70A) as a tool for characterization of liquid crystal polymers. 

Figure 3. Thermo optical analysis (TAO) of polyester PHQ/TA/4,4 -K = 0.5/0.285/0.215 with different sample thicknesses.

Thermo-optic analysis is carried out in the absence of aligning... 

As in the case of PG253 the thermo-optic analysis, figure 7, was carried out without the use of aligning fields (surface or... 

Etherimide Amideimide Examined by thermo-optical analysis Ryu et al. (2000)... 

Thermo-optical analysis (TOA) Dielectric thermal analysis (DEA)... 

Thermo-molecular beam analysis Temperature modulated DSC cfr MTDSC) Thermomicrophotometry Thermo-optical analysis Thermo-oxidative degradation Time-of-flight laser-microprobe mass spectrometry Time-of-flight mass spectrometry Time-of-flight secondary ion mass spectrometry Thermal oxyluminescence Thermal programming Two-photon absorption spectroscopy... 

All viscosities were measured in chloroform at 25 C. Bromine contents were based on elemental analyses for C, H and Br and were corroborated by nmr. Tg values are averages for the second and third scans on a Perkin-Elmer DSC-2 differential scanning calorimeter (40°/min). In several cases, particularly when the DSC transitions were very weak, the Tg was measured by thermo-optical analysis (TOA)... 

Figure 5.4 Transmitted light intensity versus temperature in thermo-optical analysis at two heating rates (10 and 40°C min ) for 80/20 PCL/SAN sample.

More exotic —that is, so far, less frequently used—methods are also worth noting dielectric relaxation on which we have a whole chapter by Jozef Moscicki thermally stimulated depolarization " electro-optical behavior" (time dependence of transmitted light intensity under a low frequency electric field) thermo-optical analysis" " (temperature dependence of the transmission of light through birefringent... 

Nowadays, thermo-optical methods are considered the most reliable measurement techniques for OC/EC split in atmospheric aerosols. Nevertheless, methods for TC/EC/BC analysis in atmospheric particles are still open to debate and their different analytical approaches have been the main cause for performing intercomparison studies (Schmid et al., 2001 ten Brink et al., 2004). The TC measurements showed good agreement, whereas the results of EC/BC determinations were highly variable due to EC overestimation by thermal methods. Furthermore, caution must be taken when using BC as an estimative of the EC content in aerosols, and vice versa BC and EC measurements are associated to the carbon content of colored and refractory organic compounds, respectively, which can lead to substantially different results between methods (Poschl, 2005). 

A. Routine analysis of PTH-amino acids using Micellar Electrokinetic Capillary Chromatography with Thermo-optical Absorbance Detection (MECC-TOAD)... 

Chem. Descrip. Aluminum silicate, thermo-optic Chem. Analysis SiOj (51.0-52.4%), AtO, (42.1-44.3%), moisture (0.5% max.)... 

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