Glass-Forming Photoconductive Organic Compounds. I. Phase Change and Single Crystal Growth of 1,3-Diphenyl-5-(p-Chlorophenyl)-Pyrazoline
It is well known that linear polymers regarded as amorphous solids generally keep a stable glassy state for quite a long time at around room temperature or above. Some low-molecular-weight organic compounds have also been reported to form stable glasses at around room temperature or above, where either the three-dimensional hydrogen-bonding force or only van der Waals force is operative. A branched, propeller-like hydrocarbon, e.g., 1,3,5-tri-α-naphthylbenzene, is a typical example of a van der Waals glass former, which is reported to form a glass spontaneously on cooling with a glass transition temperature at about 70°C (1).
KeywordsDifferential Thermal Analysis Glassy State Seed Crystal Single Crystal Growth Large Single Crystal
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- 2.S. Katsuragi, K. Okamoto, R. Matsuyama, S. Kusabayashi, and H. Mikawa, unpublished results; for pyrazoline derivatives, see Japanese Patent Application Disclosure No. 5466 of 1959, Kalle and Company, A.G.Google Scholar
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