Morphology and crystallisation kinetics of polyethylene / montmorillonite nanocomposites

Green, C.D.; Vaughan, A. S.

doi:10.1109/ceidp.2007.4451507

Cited by 1 publication

(2 citation statements)

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“…In the low magnification micrographs of the nanocomposites, there is little evidence of the banded spherulitic morphology that characterises the unfilled system; the higher magnification images reveal a much more disordered morphology. This is consistent with the work of Green et al [24], who reported that dispersing MMT platelets into polyethylene resulted in system characterised by enhanced nucleation and a disordered lamellar texture.…”

Section: Resultssupporting

confidence: 82%

“…This could be attributed to the stronger interaction between the boron nitride and the polymer matrix as the hBN content increases, due to the increasing nucleating effect. Green et al [25] found similar observations where they found that the addition of MMT particles into polyethylene resulted in a system with a highly disordered morphology due to the inhibition of crystal growth, similar to the system studied here. Similar results have been reported by Chan et al [26] in polypropylene/calcium carbonate showing SEM images of polypropylene with spherulites 40 lm in size whereas the nanocomposites containing 9.2 vol% of filler showed no spherulites and a completely different morphology.…”

Section: Resultssupporting

confidence: 71%

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Enhanced dielectric properties of polyethylene/hexagonal boron nitride nanocomposites

et al. 2017

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A range of nanocomposites based on a polyethylene polymer and hexagonal boron nitride (hBN) filler have been explored in this study. The dielectric properties of the nanocomposites, which consisted of 2, 5, 10, 20 and 30 wt% of hBN, have been compared to the dielectric properties of the unfilled polyethylene blend. Scanning electron microscopy revealed that the hBN was uniformly distributed in the polyethylene matrix, although large amounts of agglomerates were present in the nanocomposites containing more than 10 wt% of hBN. The incorporation of hBN into polyethylene resulted in a highly disordered morphology in comparison with the unfilled polyethylene, in which this effect was more pronounced with increasing hBN content. This is consistent with the increasing crystallisation temperature as the hBN content increases, as shown by differential scanning calorimetry, where the hBN acted as a highly effective nucleating due to the strong interactions between the polyethylene and the hBN. This strong interaction is again reflected in the thermal decomposition temperature which similarly increases with increasing hBN content. The study demonstrates the remarkable electrical properties of the prepared nanocomposites, where the breakdown strength monotonically increased as a function of hBN content, even with a very high 30 wt% of hBN. The improvement in electrical properties, even at high hBN concentrations, is contradictory to the reported results in the literature and is mainly attributed to the hydrophobic surface of the hBN particles.

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Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 71%