Spectroscopic and light scattering studies of the conformational (rod‐to‐coil) transition of poly(diacetylene) in solution

摘要: A rod‐to‐coil conformational transition has been demonstrated for polydiacetylene, 4‐butoxy‐carbonyl‐methylurethane (4BCMU) in solution. The can be induced by changing either the temperature or quality of solvent. light scattering and spectroscopic data as a function polymer concentration have shown that is single chain (intramolecular) phenomenon. However, because large end‐to‐end length (L≂1.2 μm) fully extended polymer, dilute limit not reached until concentrations below 10−5 g/cm3. At higher evidence cluster growth aggregation are observed prior to gelation which occurs above critical c0≂5×10−4 This result rod‐like conformation individual molecules, but it cause transition. increase intensity (at fixed concentration) on going from coil rod follows directly change dielectric constant due ...