Characterization Of Various Types Of Nanofillers Filled Crosslinked Polyethylene Composites For Cable Application
This research is to study the effect of nanofillers on mechanical, physical, dielectric and thermal properties of the crosslinked polyethylene (XLPE) matrix. Untreated nanofillers used are zinc oxide (ZnO) and aluminium oxide (Al2O3). Treated nanofillers used are organoclay (OMMT), 3-aminopropylt...
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| Format: | Thesis |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://eprints.usm.my/46666/1/Characterization%20Of%20Various%20Types%20Of%20Nanofillers%20Filled%20Crosslinked%20Polyethylene%20Composites%20For%20Cable%20Application.pdf |
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| Summary: | This research is to study the effect of nanofillers on mechanical, physical,
dielectric and thermal properties of the crosslinked polyethylene (XLPE) matrix.
Untreated nanofillers used are zinc oxide (ZnO) and aluminium oxide (Al2O3).
Treated nanofillers used are organoclay (OMMT), 3-aminopropyltriethoxysilane
treated ZnO (KH550-ZnO), triethoxycaprylylsilane treated ZnO (TCS-ZnO) and
aluminic ester treated Al2O3 (AE-Al2O3). XLPE nanocomposites were prepared by
melt mixing with a single screw extruder followed by hot press moulding. Different
weight percentages (0.5, 1, 1.5 and 2 wt%) were compounded in untreated and
treated nanocomposites. Combinations of ZnO/Al2O3 and ZnO/OMMT with different
ratios (75/25, 50/50 and 25/75) in total of 1 wt% filler loading were compounded in
hybrid nanocomposites. Nanocomposites were tested as per ASTM standard methods
and characterized with scanning electron microscopy (SEM), thermogravimetric
analysis (TGA) and differential scanning calorimetry (DSC). The results showed that
the addition of untreated and treated nanofillers improved tensile property, burning
rate, dielectric property and decomposition temperature. However, it has limited
effect on the water resistance property, melting and crystallization temperatures. The
optimal filler loading was 1.5 wt% and the effect of Al2O3 is better than ZnO and
OMMT nanofillers based on most properties. Surface treatment with coupling agent
enhanced the interface between the filler and the matrix with chemical bonding.
Strong filler-matrix interaction further improved the properties of composite. The
optimal filler loading was 1.5 wt% and the effect of AE-Al2O3 is better than KH550-
ZnO and TCS-ZnO nanofillers based on most properties. In hybrid nanocomposites,
the best filler ratio was 50/50 in ZnO/Al2O3 and 75/25 in ZnO/OMMT combinations
which induced synergistic properties. Overall, AE-Al2O3(1.5)/XLPE nanocomposite
has the best results. As compared with the unfilled XLPE, it has led to the significant
improvement in tensile strength (59%), elongation at break (51%), Young’s modulus
(60%), contact angle (4%), dielectric breakdown strength (35%), volume resistivity
(55%), decomposition temperature and reduced burning rate (14%). It is suitable for
cable insulation application due to its extraordinary mechanical, physical, dielectric
and thermal properties. |
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