Two different alumina powders were dispersed in low-density polyethylene (LDPE) to evaluate if any role can be ascribed to the crystalline phase, size and morphology of the alumina filler. In particular a submicrometric α-alumina and a nanocrystalline transition (γ/δ) alumina were added to the polymer at 5 wt% concentration, using a Brabender mixing unit. Both the neat inorganic fillers showed a good dispersibility in the polyolefin. The thermal and mechanical properties of the composites obtained were evaluated. As expected, a significant increase of the stiffness and abrasion resistance of LDPE was achieved in both cases. Furthermore, the composites showed a higher thermo-oxidative stability with respect to neat LDPE. Independent of their crystalline phase, size and morphology, both fillers gave a similar enhancement of composite features.

Effect of various alumina nano-fillers on the thermal and mechanical behaviour of low-density polyethylene-Al2O3 composites / Malucelli, Giulio; Palmero, Paola; Ronchetti, Silvia Maria; Delmastro, Alessandro; Montanaro, Laura. - In: POLYMER INTERNATIONAL. - ISSN 0959-8103. - STAMPA. - 59:8(2010), pp. 1084-1089. [10.1002/pi.2832]

Effect of various alumina nano-fillers on the thermal and mechanical behaviour of low-density polyethylene-Al2O3 composites

MALUCELLI, Giulio;PALMERO, PAOLA;RONCHETTI, Silvia Maria;DELMASTRO, ALESSANDRO;MONTANARO, Laura
2010

Abstract

Two different alumina powders were dispersed in low-density polyethylene (LDPE) to evaluate if any role can be ascribed to the crystalline phase, size and morphology of the alumina filler. In particular a submicrometric α-alumina and a nanocrystalline transition (γ/δ) alumina were added to the polymer at 5 wt% concentration, using a Brabender mixing unit. Both the neat inorganic fillers showed a good dispersibility in the polyolefin. The thermal and mechanical properties of the composites obtained were evaluated. As expected, a significant increase of the stiffness and abrasion resistance of LDPE was achieved in both cases. Furthermore, the composites showed a higher thermo-oxidative stability with respect to neat LDPE. Independent of their crystalline phase, size and morphology, both fillers gave a similar enhancement of composite features.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2294470
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