Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 115, Issue 12, Pages 2864-2869Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp111894m
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Funding
- National Natural Science Foundation of China [20974109, 51073155, 50733003]
- Ministry of Science and Technology of China [2007BAE42B02]
- Chinese Academy of Sciences [KGCX-YW-208]
- Scientific and Technological Developing Project of Jilin Province [20095003, 20100107]
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The effects of the addition of poly(D-lactide) (PDLA) on the crystallization behavior of poly(L-lactide) (PLLA) were investigated by means of differential scanning calorimetry (DSC) and temperature-dependent X-ray diffraction(XRD). When the blends were cooled from different temperatures (250, 240, and 190 degrees C) at the rate of cooling of 5 degrees C/min, stereocomplex (sc) crystallites could stay at diverse states. Accordingly, the stereocomplexes acted as a nucleation agent exerting distinct effects on PLLA crystallization. The speculated mechanisms of the stereocomplex formation and the effectiveness as a nucleating agent are schematically described. Moreover, temperature-dependent XRD was carried out to further :investigate the melt-crystallization behavior of PLLA/PDLA blends in real time. Temperature-dependent XRD results indicated that even at 240 degrees C the stereocomplex crystallites in all blend samples. existed clearly, which could not be detected by DSC. These XRD results further suggest that the onset T-c values for the PLLA alpha-form crystals formation were 160, 120, 140, and 160 degrees C, respectively, for neat PLLA, PLLA/PDLA 95/5, 90/10, and 80/20 as well as 70/30 samples.
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