Journal
POLYMER BULLETIN
Volume 67, Issue 5, Pages 775-791Publisher
SPRINGER
DOI: 10.1007/s00289-010-0419-2
Keywords
N-Aminophthalimide; Poly(lactic acid); Nucleating agent; Crystallization
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Funding
- National High Technology Research and Development Program of China [2006AA02Z248]
- Program of Shanghai Subject Chief Scientist [07XD14029]
- Shanghai International co-operation of Science and Technology [075207046]
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The effect of N-Aminophthalimide compound (NA-S) as nucleating agent on crystallization behavior and morphology of poly(lactic acid) was studied. With polarized optical microscope (POM), the unique phenomena of nucleation and epitaxial crystallization of PLA/NA-S system were observed. Dynamic morphology of crystallization was also studied by POM to investigate the relationship between growth behavior of PLA and nucleating agent. Isothermal and non-isothermal crystallization behavior of PLA were studied by differential scan calorimeter (DSC). When nucleating agent was added, a new peak appeared in wide angle X-ray diffraction (WAXD) compared with pure PLA, indicating the nucleating effect of NA-S on crystallization of PLA. All the results indicate that the nucleating agent of NA-S shows obvious nucleating effect on isothermal crystallization above 120 A degrees C and in non-isothermal crystallization after it is added in PLA, that is, the induction crystallization time is reduced, the crystallization rate and nucleation density of PLA are increased.
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