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Authors
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Nagendra, B. ; Leuteritz, A. ; Gowd, E.B.
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Title
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Multiwalled carbon nanotubes decorated with layered double hydroxides as multifunctional fillers for polypropylene
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Date
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13.09.2022
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Number
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60824
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Abstract
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The multiwalled carbon nanotubes (CNTs) decorated with exfoliated and fragmented layered double hydroxides (CNT-LDH hybrids) were used as multifunctional nanofillers for isotactic polypropylene (iPP). Under similar experimental conditions, iPP/CNTs and iPP/LDH nanocomposites were also prepared. Compared to neat iPP, both CNT-LDH hybrids and LDH showed effective nucleation ability for iPP. Hybrid CNT-LDH fillers are found to improve the thermal stability and flame retardancy of iPP significantly even with minimum loadings (1 wt% CNTs + 1 wt% LDH) compared to the individual fillers. The highest 50·% weight loss temperature was observed for iPP/CNT-LDH nanocomposites. The nanocomposite prepared with 2 wt% of CNT-LDH hybrid fillers showed a reduction of heat release rate (HRR) of 59·%, which is much higher than the nanocomposites prepared with 2 wt% of CNTs (30.5·%) and 2 wt% of LDH (19·%). The limiting oxygen index value of iPP is 16.5·% and it increases to 23·% for iPP/CNT-LDH nanocomposites. We have shown that the synergetic effect between CNTs and LDH can surpass individual nanofillers as effective flame retardants due to the capability of formation of a jammed network in the polymer matrix and effective char formation to restrict the transport of volatile compounds during the burning of the polymer.
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Publisher
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ChemistrySelect
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Wikidata
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Citation
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ChemistrySelect 7 (2022) Article Number: e202201922
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DOI
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https://doi.org/10.1002/SLCT.202201922
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