CAJ | 학술논문

根据能量守恒和热传递定律,推导出功率补偿式DSC曲线的理论方程.以纯物质铟的DSC熔融曲线为例,说明其升温扫描过程可分为熔融前、熔融和熔融后3个阶段以及与DSC理论方程的对应关系.DSC曲线分析结果表明:熔点温度对应熔融起始温度;熔融后阶段的曲线以指数形式衰减,热时间常数值越大,熔融后曲线的拖尾时间越长;熔融焓对应于DSC曲线的基线以上和熔融开始至熔融结束曲线以下所包络的面积.论证了测定热阻的理论依据及热阻对DSC曲线的影响.以多组分样品体系的模拟DSC曲线为例,说明聚合物熔融DSC曲线的特征来源.
근거능량수항화열전체정률,추도출공솔보상식DSC곡선적이론방정.이순물질인적DSC용융곡선위례,설명기승온소묘과정가분위용융전、용융화용융후3개계단이급여DSC이론방정적대응관계.DSC곡선분석결과표명:용점온도대응용융기시온도;용융후계단적곡선이지수형식쇠감,열시간상수치월대,용융후곡선적타미시간월장;용융함대응우DSC곡선적기선이상화용융개시지용융결속곡선이하소포락적면적.론증료측정열조적이론의거급열조대DSC곡선적영향.이다조분양품체계적모의DSC곡선위례,설명취합물용융DSC곡선적특정래원.
A theoretical formula of power compensation DSC curve was derived from the law of energy conservation and heat transfer. The DSC melting curve of pure indium was studied as an example. It was illustrated that the heating trace of pure indium consists of three parts, which include "before melting", "melting" and "after melting" process corresponding to the three components of DSC theoretical formula, respectively. DSC curve analysis disclosed that melting temperature corresponds to the onset temperature of "melting" curve. "After melting" curve decays exponentially. The larger the value of thermal time constant is, the longer the time of "after melting" curve experiences. Melting enthalpy equals to the area above base line and beneath "melting" and "after melting" curve. The theoretical basis for thermal resistance (R) measurement and the effect of R on the DSC curve shape were illustrated. A simulated DSC curve of a multi-component system was produced to explain the origin of the characteristics of DSC melting curve of polymers.