The effect of processing parameters on the mechanical properties of auxetic polymeric fibers

Alderson, K. L.; Alderson, Andrew; Davies, Philip; Smart, G.; Ravirala, N.; Simkins, G.

doi:10.1007/s10853-006-1325-8

Cited by 28 publications

(39 citation statements)

References 27 publications

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“…These have been obtained by plotting the average of all 10 tests carried out in order to ensure accuracy. 40% of all the auxetic fibres tested displayed auxetic character before annealing took place [15], typically having 20% auxetic sections along their length. The average Poisson's ratio for the auxetic sections was ν = -1.62.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Figure 2 shows that not all available rollers are used and this is because, as noted above, the fibres were collected with very low draw as from previous work [14,15] drawing of the fibres reduces their auxeticity. Also based on previous work [13][14][15], processing temperatures were defined such that a batch of auxetic fibres was produced with all extruder zones set to 159 °C, which gives the maximum degree of auxeticity. A batch of nonauxetic fibres was produced for comparison purposes under exactly the same conditions except that the temperature profile was amended to 163 °C across all zones.…”

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confidence: 96%

“…The Poisson's ratio of those auxetic regions was found to be, on average, ν = -1.62 [14,15]. By varying the processing conditions, it was possible to produce fibres of identical dimensions and mechanical properties except that their Poisson's ratios were of opposite sign, typically ν = + 0.34.…”

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confidence: 99%

“…The paper also explores the possible mechanisms at work in the fibres. It is known that the most successful method for producing these auxetic melt PP extruded products was to keep the processing temperature as close to the melting temperature (in this case 159 °C) of irregular shaped powder particles of fairly wide size distribution [15]. This is thought to cause only partial melting of the particles, leaving the core un-melted or softened at the most.…”

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confidence: 99%

“…5 and 6. Each step corresponds to a value of 0.1 µm, which represents the resolution of the experimental set up employed in this work [15,21]. To obtain a value for the Poisson's ratio, a strain-strain plot was constructed from this raw data.…”

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An experimental study of thermal post‐production processing of auxetic polypropylene fibres

Simkins

Ravirala

Davies

et al. 2008

Physica Status Solidi (b)

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Following the successful batch production of auxetic ultra high molecular weight polyethylene, polypropylene and nylon, in the form of 10 mm diameter cylinders, a continuous melt extrusion route was adapted from conventional melt extrusion routes to produce fibres. Previous studies have shown that, once drawing has occurred, the auxetic effect is lost and, consequently, the mechanical properties of these fibres have been restricting their otherwise great potential in a wide range of applications. Research has therefore been undertaken into improving this matter by subjecting the auxetic fibres to a range of different thermal post‐production processing conditions. The fibres then underwent mechanical testing, Differential Scanning Calorimetry and Video Extensometry. Results suggest that annealing enhances the mechanical properties of these fibres and may provide a further route to enhancing auxeticity in improving homogeneity by over 40%. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Mechanical Propertiesmentioning

confidence: 99%

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confidence: 96%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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