Polydiacetylenes, where R(CH2)3,4OCONHCH2COO(CH2)1,3CH3 dissolve almost instantaneously within a narrow range of temperature (ca. 3°C). The enthalpy of dissolution of these polymers is determined by differential scanning calorimetry to be 25–46kJ/mole of the repeat unit. The abruptness of dissolution is due to breaking of intramolecular H bonds, which appears to be a cooperative phenomenon. Supporting infrared evidence is cited.
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Patel et al. (1980) studied this question.
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