Diacetylene crystals reflectivity

Figure 4. Reflectivity of the PTS-diacetylene crystal for two different temperatures.

The Fresh-Check is based on a solid state polymerization. The TTI function is associated with the property of disubstituted diacetylene crystals (R-is based on a solid state polymerizatiom Tcontrofled solid-state reaction proceeding via 1,4-addition polymerization, which leads to a highly colored polymer (Patel et al., 1976, Patel and Yee, 1980). During polymerization, the crystal stracture of the monomer is retained and the polymer crystals remain chain aligned and are effectively one-dimensional in their optical properties (Patel and Yang, 1983). The color response of the TTI can be observed in terms of a decrease in reflectance. 

Fig. 1.11 Below Two single crystals of the polydiacetylene paratoluyl-sulfonyl-oximethylene-diacetylene (TS6). Above three monomer crystals, illuminated with linearly polarised light. The polarisation direction of the light is horizontal, and the b axis of the polymer chains is oriented parallel to the long axis of the crystals. The polymer crystals strongly reflect light (below left) when the light...

Fig 1 Polaurized reflectivity spectra on the (lOO) surface of monomer (uj per) and polymer (lower) single crystals of TS diacetylene at room ten rature ... 

---