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本文采用差示扫描量热法(DSC)除测得了碳酸氢铵分解热为41.52±0.46KCal·mole~(-1)和一水合磷酸二氢钙脱水热为14.69±0.26KCal·mole~(-1)外,还测得了P—(4—正戊基—1—环已基)—苯甲酸—P′—氰基—苯酯液晶由晶体向向列相转变的热焓、熔融熵及由向列相转变为各向同性液体的转变热焓、清亮熵,它们的值分剐为21.28KJ·mole~(-1),55.69J·mole~(-1)。K~(-1),1.06KJ·mole~(-1)和2.13J·mole·K~(-1)。由该法测得上述所有热效应的值,其精密度和准确度均在2%以内。
In this paper, the heat of decomposition of ammonium bicarbonate was 41.52 ± 0.46KCal · mole ~ (-1) and the dehydration heat of calcium dihydrogen phosphate monohydrate was 14.69 ± 0.26KCal · mole ~ (-) in addition to the differential scanning calorimetry (DSC) 1), the enthalpy, the entropy of melting of the P-(4-n-pentyl-1-cyclohexyl) -benzoic acid-P’- The enthalpy and entropy of the transition from nematic phase to isotropic liquid are 21.28KJ · mol ~ (-1) and 55.69J · mol ~ (-1), respectively. K -1, 1.06 KJ · mole -1 and 2.13 J · mole · K -1. The value of all these thermal effects measured by this method is within 2% of the accuracy and accuracy.