Transmitted light microscopy temperatures

Morrow (52) has described a DTA-light photometer polarizing system for hot-stage microscopy. Thermocouple wires. 0.003 in. in diameter, were used to detect the 7 — Tr) temperature difference fo r simultaneous DT A measurements. Sample capsules were fabricated by bending small, identical stripes of AI foil over both sample and reference thermojunctions. A small hole in the foils permitted the viewing of the sample by transmitted light microscopy. The primary use of the apparatus was to study the thermal properties of thermally sensitive polymers (84). 

Figure 11.8 Photographs of gels In the core layer of a three layer film a) transmitted polarized light, and b) hot stage microscopy was used to determine the melting temperatures of the core resin and defects. Photographs were provided by E. Garcia-Meitin of The Dow Chemical Company...

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