4-羟甲基吡啶的热力学性质

用精密自动绝热量热计测定了4-羟甲基吡啶在79～380 K温区的摩尔热容. 实验结果表明, 该化合物在79～301 K温区无相变和热异常现象发生, 在301～331 K, 发生固-液相变, 其熔化温度、摩尔熔化焓及摩尔熔化熵分别确定为：325.12 K, 11.78 kJ•mol^-1 和36.23 J•K^-1•mol^-1. 根据热力学函数关系式, 从热容值计算了4-羟甲基吡啶在80～380 K温区以标准状态（298.15 K）为基准的热力学函数值. 用热重法(TG)对该化合物的热稳定性作进一步考察, 从TG曲线上观察到该化合物在490 K有最大的蒸发失重速率.

Thermodynamic Studies of 4-pyridinemethanol

The molar heat capacities of 4-pyridinemethanol were measured with a precision automated adiabatic calorimeter over the temperature rang from 79 K to 380 K. No phase transition or other thermal anomaly was observed in the range of 79～301 K. The melting point, molar enthalpy, Δ_fusH_m, and molar entropy, Δ_fusS_m, of fusion for this compound were determined to be 325.12 K, 11.78 kJ•mol^-1 and 36.23 J•K^-1•mol^-1, respectively. The thermodynamic functions relative to the reference temperature (298.15 K) were calculated based on the heat capacity measurements in the temperature range from 80 K to 380 K. The TG-DTG results demonstrated that the maximum rate of mass loss of the sample took place at about 490 K, which corresponds to the boiling temperature of the compound under the experimental conditions.