Thermal properties and miscibility of semi-crystalline and amorphous PLA blends

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[1] [1,2,Gao, Chengcheng
[2] Bao, Xianyang
[3] Yu, Long
[4] Liu, Hongsheng
[5] Simon, George P.
[6] Chen, Ling
[7] Liu, Xingxun
来源：
Yu, L. (felyu@scut.edu.cn) | 1600年
关键词：
The focus of this research is the study of the microstructures and miscibility at the interface between semi-crystalline and amorphous PLAs [poly (l-lactic acid)(PLLA) with poly (l; d-lactic acid)(PDLLA); respectively]. The blends are prepared through thermal processing (extrusion and hot-pressing). To increase the area of interface between PDLLA and PLLA; the fibers from PLLA and PDLLA are used. Thermal and microstructures of the blends were studied by differential scanning calorimetry (DSC); polarized optical microscopy (POM); dynamic thermogravimetric analysis(DMA); small-angle X-ray diffraction(SAXS) and wide-angle X-ray diffraction (WAXD). The two PLAs are miscible in molten state. However; phase separation is detected after various thermal treatments; with PDLLA being excluded from the regions of interlamellar PLLA regions when PDLLA content is low; as determined from X-ray diffraction studies. The compatibility between the two PLAs is not perfect in the molten state; since enthalpies of the various blends at Tg are lower than any pure PLA material. The semi-crystalline PLLA fiber can recrystallize alone in the molten amorphous PDLLA; and a higher nuclei density is observed at the interface. © 2014 Wiley Periodicals; Inc;
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