差示扫描量热仪对物质相变潜热的精确量度

Accurate Determination of Latent Heat via Differential Scanning Calorimetry

针对差示扫描量热仪(DSC)曲线相变前后的基线产生位移时如何计算相变潜热的问题,提出了1种零相变潜热等价基线的概念。相变潜热即为DSC热流曲线与零相变潜热等价基线所围的面积。这一曲线可用迭代法求得。运用这一方法测定了尼龙66的真实相变潜热。

To overcome the problem of DSC baseline displacement before and after the phase transition, a concept of equivalent non-latent heat baseline is proposed to calculate the latent heat. The real latent heat is the area enclosed by DSC heat flow curve and equivalent non -latent heat baseline. This curve could be evaluated by an iterative procedure. The real latent heat of Nylon 66 is measured by the proposed method.