Temperature‐modulated differential scanning calorimetry studies on the origin of double melting peaks in isothermally melt‐crystallized poly(L‐lactic acid)
Temperature‐modulated differential scanning calorimetry studies on the origin of double melting peaks in isothermally melt‐crystallized poly(L‐lactic acid)
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DOI：
10.1002/polb.21056
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发表时间：
2007-02
期刊：
影响因子：
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通讯作者：
Yeong-Tarng Shieh;Ginger L. Liu
中科院分区：
文献类型：
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作者：
Yeong-Tarng Shieh;Ginger L. Liu
采用差示扫描量热法（DSC）和温度调制差示扫描量热法（TMDSC）研究了聚L-乳酸（PLLA）非等温和等温熔融结晶的熔融行为。PLLA在100-110 ℃范围内的温度下120 min或在110 ℃范围内的时间下10-180 min的等温熔融结晶似乎在10 ℃/min的DSC加热曲线中表现出双峰。在110 °C下熔融结晶较短时间（<30 min）后，PLLA样品中双熔融峰的形成以重结晶机制为主。而在较高温度（108或110 °C）下结晶120 min或在110 °C下结晶较长时间（≥45 min）的PLLA样品中，双熔融峰的形成以双层片层厚度模型为主。
In this work, the melting behaviors of nonisothermally and isothermally melt-crystallized poly(L-lactic acid) (PLLA) from the melt were investigated with differential scanning calorimetry (DSC) and temperature-modulated differential scanning calorimetry (TMDSC). The isothermal melt crystallizations of PLLA at a temperature in the range of 100-110 °C for 120 min or at 110 °C for a time in the range of 10-180 min appeared to exhibit double melting peaks in the DSC heating curves of 10 °C/min. TMDSC analysis revealed that the melting-recrystallization mechanism dominated the formation of the double melting peaks in PLLA samples following melt crystallizations at 110 °C for a shorter time (<30 min) or at a lower temperature (100, 103, or 105 °C) for 120 min, whereas the double lamellar thickness model dominated the formation of the double melting peaks in those PLLA samples crystallized at a higher temperature (108 or 110 °C) for 120 min or at 110 °C for a longer time (≥45 min).