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Halloysite nanotubes as a novel β-nucleating agent for isotactic polypropylene
- Source :
-
Polymer . Jun2009, Vol. 50 Issue 13, p3022-3030. 9p. - Publication Year :
- 2009
-
Abstract
- Abstract: The nucleating ability of halloysite nanotubes (HNTs) towards isotactic polypropylene (iPP) was investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), polarized optical microscopy (POM) and scanning electron microscopy (SEM). HNTs are identified to have dual nucleating ability for α-iPP and β-iPP under appropriate kinetics conditions. The formation of β-iPP is dependent on the HNTs loading in the iPP/HNTs composites. The composite with 20phr of HNTs is found to have the highest content of β-iPP. Under non-isothermal crystallization the content of β-iPP increases with decreasing of the cooling rate. The maximum β-crystal content is obtained at cooling rate of 2.5°C/min. The supermolecular structure of the β-iPP is identified as β-hedrites with flower-cup-like and axialite-like arrangements of the lamellae. Under isothermal crystallization the β-crystal can be formed in the temperature range of 115–140°C. Outside the temperature range, no β-iPP can be observed. The content of β-crystal reaches the maximum value at crystallization temperature of 135°C. The formation of the β-iPP in the composites is correlated to the unique surface characteristics of the HNTs. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00323861
- Volume :
- 50
- Issue :
- 13
- Database :
- Academic Search Index
- Journal :
- Polymer
- Publication Type :
- Academic Journal
- Accession number :
- 40635364
- Full Text :
- https://doi.org/10.1016/j.polymer.2009.04.052