CAJ | 학술논문

采用差示扫描量热仪（DSC）测试棕榈油及其混合物在-3~5℃等温结晶所得晶体在不同升温速率下的熔融行为，讨论熔融行为对升温速率依赖性。根据升温速率和熔融曲线的关系找到最佳升温速率，并在此升温速率下分析棕榈油及其混合物在不同结晶温度Tc的熔融曲线，最后通过Hoffman-Weeks法计算出样品的平衡熔点。结果表明，棕榈油熔融行为对升温速率有很强的依赖性。棕榈油及其混合物DSC测试曲线显示，添加剂降低了每一结晶温度下棕榈油熔点Tm。所得温度Tm具有良好的线性关系， Hoffman-Weeks法计算所得平衡熔点显示，添加剂降低了棕榈油的平衡熔点。
채용차시소묘량열의（DSC）측시종려유급기혼합물재-3~5℃등온결정소득정체재불동승온속솔하적용융행위，토론용융행위대승온속솔의뢰성。근거승온속솔화용융곡선적관계조도최가승온속솔，병재차승온속솔하분석종려유급기혼합물재불동결정온도Tc적용융곡선，최후통과Hoffman-Weeks법계산출양품적평형용점。결과표명，종려유용융행위대승온속솔유흔강적의뢰성。종려유급기혼합물DSC측시곡선현시，첨가제강저료매일결정온도하종려유용점Tm。소득온도Tm구유량호적선성관계， Hoffman-Weeks법계산소득평형용점현시，첨가제강저료종려유적평형용점。
The melting behavior of palm oil and its mixture isothermally crystallized at -3~5 ℃ is investigated by using differential scanning calorimeter (DSC) test under different heating rate, and melting behavior on the heating rate dependence are discussed. According to the relationship of melting curve and heating rate, the best heating rate, analysis melting curve of palm oil and crystallized at different temperature (Tc) are found. The equilibrium melting temperature is calculated by the Hoffman-Weeks method. The results show that the increasing heating rate has highly effect on melting curves. Melting curves shows that melting point of palm oil under each crystallization temperature is higher than the mixture. The temperature Tm has a good linear relationship, and the data from Hoffman-Weeks method shows that additives can obviously reduce the equilibrium melting point of palm oil.