期刊
POLYMER ENGINEERING AND SCIENCE
卷 52, 期 5, 页码 1058-1068出版社
WILEY-BLACKWELL
DOI: 10.1002/pen.22172
关键词
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资金
- National Natural Science Foundation of China [30870633, 31000427]
- National High Technology Research and Development Program of China [2009AA03Z319]
- China Postdoctoral Science Foundation [20100481214]
- Fundamental Research Funds for the Central Universities
To accelerate the crystallization of poly(L-lactic acid) (PLLA) and enhance its crystallization ability, a multiamide nucleator (TMC) was introduced into the PLLA matrix. The thermal characteristics, isothermal and nonisothermal crystallization behavior of pure PLLA and TMC-nucleated PLLA were investigated by differential scanning calorimetry. The determination of thermal characteristics shows that the addition of TMC can significantly decrease the onset temperature of cold crystallization and meanwhile elevate the total crystallinity of PLLA. For the isothermal crystallization process, it is found that the overall crystallization rate is much faster in TMC-nucleated PLLA than in pure PLLA and increases as the TMC content is increased, however, the crystal growth form and crystalline structure are not influenced much despite the presence of TMC. In the case of nonisothermal crystallization, the nucleation efficiency and nucleation activity were estimated and the results indicate that excellent nucleation-promoting effect could be achieved when the weight percentage of TMC is chosen between 0.25% and 0.5%. Polarized optical microscopy observation reveals that the nuclei number of PLLA increases and the spherulite size reduces greatly with the addition of TMC. POLYM. ENG. SCI., 2012. (C) 2011 Society of Plastics Engineers
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