Effect of mould pressurisation on impact strength of rotationally moulded polyethylenes

Pick, Louise; Harkin‐Jones, Eileen

doi:10.1179/174328906x143868

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Such samples exhibit poor impact properties because these defects act as stress concentrators. 30 Overcuring parts result in thermo-oxidative degradation of the polymer with a concomitant deterioration in mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

“…0.25 wt.% graphite at the expense of mechanical properties. The GNP particle clusters act as stress concentration points and also encourage crack formation, thereby weakening the nanocomposites 29 . At 0.25 wt.% the compounded composite exhibits better mechanical properties due to better dispersion (Figure 7b), but they were not conductive.…”

Section: Discussionmentioning

confidence: 99%

“…The GNP particle clusters act as stress concentration points and also encourage crack formation, thereby weakening the nanocomposites. 30 At 0.25 wt.%, the compounded composite exhibits better mechanical properties due to better dispersion (Figure 7(b)), but they were not conductive. Closer inspection of the FESEM images revealed that there is hardly any adhesion between the GNPs and LLDPE, with the basal planes of the GNPs mostly uncovered by the polymer.…”

Section: Discussionmentioning

confidence: 99%

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Rotomolded antistatic and flame-retarded graphite nanocomposites

Mhike

Focke

Asante

2017

Journal of Thermoplastic Composite Materials

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Graphite nanoplatelets with an average particle size of 13 μm and an estimated flake thickness of about 76 nm were prepared by microwave exfoliation, followed by ultrasonication-assisted liquid phase delamination, of an expandable graphite. This nano-additive was used to fabricate linear low density polyethylene (LLDPE) and poly(ethylene-co-vinyl acetate) (EVA) based nanocomposite sheets using rotational moulding. The dry blending approach yielded surface resistivities within the static dissipation range at filler loadings as low as 0.25 wt.% (0.1 vol.%). However, even at this low graphite content, impact properties were significantly reduced compared to the neat polymers. Bilayer mouldings via the double dumping method proved to be a feasible approach to achieve both acceptable mechanical properties and antistatic properties. This was achieved by rotomolding nanocomposite sheets with a 1 mm outer layer containing the filler and a 2 mm inner layer of neat LLDPE. Excellent fire resistance, in terms of cone calorimeter testing, was achieved when the outer layer also contained 10 wt.% expandable graphite.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Rotomolded antistatic and flame-retarded graphite nanocomposites

Mhike

Focke

Asante

2017

Journal of Thermoplastic Composite Materials

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“…Thus, the surface and internal bubble formation is more when compared with unreinforced LLDPE. The void formation can be controlled to some extent by mould pressurization technique during the heating zone while processing the composites [44,45].…”

Section: Void Content Testmentioning

confidence: 99%

A comparative study of mechanical, dynamic mechanical and morphological characterization of tampico and coir fibre-reinforced LLDPE processed by rotational moulding

Abhilash

Singaravelu

2020

Journal of Industrial Textiles

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Natural fibres find their application as a reinforcing agent for polymer composites to obtain parts with improved mechanical properties. Manufacturing of non-metallic products is incorporated with natural fibres for better strength and to reduce cost. Rotational moulding is a process used for the manufacturing of hollow plastic products, especially water tanks, plastic fuel tanks, barrels, kayaks, refrigerated panels, etc. Incorporation of natural fibres to reinforce polymers in rotational moulding process is a tedious task; since there is no control over fibre and polymer powder mixture, which is rotating bi-axially, it may lead to fibre agglomeration. The present work investigates the mouldability of linear low density polyethylene composites with tampico and coir fibre as the reinforcement agents using a bi-axial rotomoulding machine. NaOH-treated fibres with 5, 10 and 15% by weight have been added to the linear low density polyethylene matrix, and the composites were prepared by rotational moulding process. Mechanical properties such as tensile strength, flexural strength, impact strength and hardness have been investigated. Dynamic mechanical behaviour such as storage modulus, loss modulus and tan δ of the different composites has been investigated with dynamic mechanical analyser. Fractured surfaces were examined qualitatively with the help of a scanning electron microscope for determining the interfacial properties and fibre adhesion between the fibres and the linear low density polyethylene matrix.

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“…Once the sintering phase is complete, the result is a continuous mass of the melted polymer. This mass is composed mainly of the resin used and the air trapped inside [14, 15]. The process by which air trapped in bubbles within the melt begins to diffuse into the polymer is commonly known as densification [5, 16].…”

Section: Introductionmentioning

confidence: 99%

Densification of fibre-reinforced composite polymers under rotational moulding conditions

Castellanos

Martin

McCourt

et al. 2022

Plastics, Rubber and Composites

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The present work investigated the effect of fibre's presence on the densification of rotomoulding-grade polyethylene. Nevertheless, the presence of fibres during densification directly impacts the current understanding of how densification works during heating. The present work focuses fibre-reinforced polymer densification to study the effect of fibre addition on bubble formation during this process. A densification test was developed to observe and measure fibre addition's effect on polymer densification and bubble disappearance. The test focused on measuring the cross-section area corresponding to bubbles appearing in the melt and comparing results to clarify whether fibre addition alters this process. Results showed that, although heating parameters and particle size affect bubble morphology and disappearance, fibres' presence does not substantially affect the bubbles. Finally, results showed that polymer-fibre characterisation plays a crucial role in sintering and densification, and work is continuing to present conclusions about how sintering and densification affect the full-scale manufacturing process.

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Effect of mould pressurisation on impact strength of rotationally moulded polyethylenes

Cited by 6 publications

References 8 publications

Rotomolded antistatic and flame-retarded graphite nanocomposites

Rotomolded antistatic and flame-retarded graphite nanocomposites

A comparative study of mechanical, dynamic mechanical and morphological characterization of tampico and coir fibre-reinforced LLDPE processed by rotational moulding

Densification of fibre-reinforced composite polymers under rotational moulding conditions

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