Journal
THERMOCHIMICA ACTA
Volume 484, Issue 1-2, Pages 48-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tca.2008.12.003
Keywords
Polyamide 6; Halloysite; Nanocomposite; Crystallization; Effective activation energy; Polymorphism
Funding
- National Natural Science Foundation of China [50603005]
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Non-isothermal crystallization and the polymorphism of the PA6 and the polyamide 6/halloysite nanotubes (PA6/HNTs) nanocomposites are studied by adopting differential scanning calorimetry (DSC) analysis, X-ray diffraction (XRD) analysis and polarized optical microscopy (POM) observations. HNTs act as nucleating agent and accelerate the crystallization. The kinetics analysis indicates that the fold-surface free energy of PA6/HNTs nanocomposites is larger than that of neat PA6. The increasing tendency of the fold-surface free energy of PA6/HNTs nanocomposites is restricted at higher HNTs loading. interestingly, the crystallinity of the PA6/HNTs nanocomposites increases with cooling rate. HNTs content is found to have a significant effect upon the crystallinity of the PA6/HNTs nanocomposites, and the crystallinity reaches its maximum with 5 phr of HNTs content. Moreover. the higher HNTs content is. the larger percentage gamma-phase crystals take up. The crystallization behavior of the PA6/HNTs nanocomposites is correlated with the multiple roles of HNTs in the crystallization of PA6. (C) 2008 Elsevier B.V. All rights reserved.
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