The transitions and melting behavior of thermally crystallized poly(ethylene terephthalate) and their correlations with ftir and density measurements
The transitions and melting behavior of thermally crystallized poly(ethylene terephthalate) and their correlations with ftir and density measurements
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热结晶聚对苯二甲酸乙二醇酯的转变和熔化行为及其与 ftir 和密度测量的相关性
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发表时间：
2007
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通讯作者：
J. Koenig
中科院分区：
文献类型：
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作者：
S. Lin;J. Koenig
用计算机差示扫描量热仪（DSC）研究了聚对苯二甲酸乙二酯（PET）的热结晶转变和熔融行为。在DSC热谱图中，从特征在于强玻璃化转变和放热结晶峰的结构阶段转变到具有几乎不可察觉的玻璃化转变和吸热低熔融（LM）峰的阶段。这种转变对应于PET从初级结晶过程到二次结晶过程的变化。放热结晶峰仅在初级结晶阶段内观察到。LM峰的最高温度是退火温度和时间的函数，并且取决于不完全形成的微晶的微结构。高熔融峰是更高完整性的微晶的熔融，并且受扫描期间样品的再结晶过程的影响。
The transitions and melting behavior of thermally crystallized poly(ethylene terephthalate) (PET) are studied using a computerized differential scanning calorimeter (DSC). A transition occurs from a structural stage characterized by a strong glass transition and an exothermic crystallization peak to a stage with a barely perceptible glass transition and an endothermic low melting (LM) peak in the DSC thermograms. This transition corresponds to the change from the primary to secondary crystallization process of PET. The exothermic crystallization peak is only observed within the primary crystallization stage. The maximum temperature of the LM peak is a function of annealing temperature and time, and depends on the microstructure of the imperfectly formed crystallites. The high melting peak is the melting of crystallites of higher perfection and is influenced by the recrystallization process of the sample during the scan.