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| Volume 4, Issue 04 - 2008 |
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| 2 |
THERMAL AND RHEOLOGICAL BEHAVIOUR COMPARISON OF MELT-COMPOUNDED NANOCOMPOSITES OF ATOMIC-LAYER-DEPOSITION-COATED POLYAMIDE PARTICLES AND COMMERCIAL NANOFILLERS
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| Pages 128-138 |
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| KATJA NEVALAINEN1,*, CHRISTIAN HINTZE2, REIJA SUIHKONEN1, JANNE SUNDELIN1, PIRKKO ETELÄAHO1, JYRKI VUORINEN1, PENTTI JÄRVELÄ1 AND NORA ISOMÄKI3 |
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1 Department of Materials Science, Tampere University of Technology
P.O. Box 589, FI-33101 Tampere, Finland
2 Department of Mechanical Engineering, Technical University of Chemnitz
P.O. Box 589, D-09107 Chemnitz, Germany
3 Beneq Oy
P.O. Box 46, FI-02201 Espoo, Finland
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| Received 24 June 2008 ;accepted 23 December 2008 |
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| This paper compares polyamide nanocomposites prepared from atomic-layer-deposition-(ALD)-coated polyamide particles and commercial titanium dioxide nanofillers. In the former case, micron-sized polyamide particles were coated with a thin titanium dioxide film by ALD technology. The formation of the ALD film was demonstrated with a scanning electron microscope using an energy dispersive spectrometer. Particles with titanium oxide shells were melt-compounded to form polyamide nanocomposites similarly to the traditional powder mixture of polyamide and nanofillers. The degree of dispersion in the nanocomposites was characterized with a transmission electron microscope. Furthermore, the specimens were analyzed in rheological and thermal tests to determine their properties. Results showed that a morphology very different from that of the traditionally filled polyamide nanocomposite was obtained for the extruded ALD-coated polyamide particles. Furthermore, the complex viscosity of the ALD nanocomposite was significantly lower than that of the conventionally nanofilled or pure polyamide. The effect of these changes on the processing characteristics of polyamide nanocomposites are discussed in terms of thermal properties.
Keywords: N/A |
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