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Non-isothermal crystallisation kinetics of self-assembled polyvinylalcohol/silica nano-composite
- Source :
-
Polymer . Feb2005, Vol. 46 Issue 6, p1949-1955. 7p. - Publication Year :
- 2005
-
Abstract
- Abstract: A novel polyvinylalcohol/silica (PVA/SiO2) nano-composite is prepared with the self-assembly monolayer (SAM) technique. The SiO2 nano-particles are homogenously distributed throughout the PVA matrixes as nano-clusters with an average diameter ranged from 15 to 240nm depending on the SiO2 contents. Using differential scanning calorimetry (DSC), the non-isothermal crystallisation behaviour and kinetics of the PVA/SiO2 nano-composites are investigated and compared to those of the pure PVA. There are strong dependences of the degree of crystallinity (Xc), peak crystallisation temperature (Tp), half time of crystallisation (t1/2), and Ozawa exponent (m) on the SiO2 content and cooling rate. The crystallisation activation energy (E) calculated with the Kissinger model is markedly lower when a small amount of SiO2 is added, then gradually increases and finally becomes higher than that of the pure PVA when there is more than 10% SiO2 in the composite. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00323861
- Volume :
- 46
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Polymer
- Publication Type :
- Academic Journal
- Accession number :
- 19183752
- Full Text :
- https://doi.org/10.1016/j.polymer.2004.12.026