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Materials Engineering

Measuring Polymer Crystallinity with DSC

Description

Differential scanning calorimetry, or DSC, is a method used to measure the thermal properties of materials. It helps scientists see how much heat a material stores as it warms up. This heat storage is called heat capacity.

DSC also measures the heat absorbed or released during chemical reactions ...

Transcript

差示扫描量热法 (DSC) 是一种重要的测量技术,用于表征材料(尤其是聚合物)的热性能。DSC 测量装置由单独的样品盘和参比盘组成,每个盘都有相同的温度传感器。包含目标样品的样品盘和通常保持为空的参比盘的温度使用单独但相同的加热器独立控制。两个锅的温度都是线性升高的。将两个平底锅维持在相同温度所需的能量或热流量的差异记录为温度的函数。例如,如果样品盘包含的材料在发生相变或反应时会吸收能量,则样品盘下方的加热器必须比空参比盘下方的加热器更努力地提高样品盘温度。本视频将演示如何使用 DSC 测定聚合物相变并计算聚合物的结晶度百分比。

由于聚合物的长链状结构,链可以表现出长程有序,称为结晶或可以随机组织,称为无定形。结晶聚合物通过熔化经历从固体到液体的相变。而无定形聚合物通过玻璃...

Tags

Polymer CrystallinityPhase Transition AnalysisHeat Flow MeasurementGlass Transition TemperatureMelting Point DeterminationThermal Analysis TechniqueCalorimetry Data InterpretationPolymer Sample PreparationHeat Capacity Calculation

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