Polyolefins are the plastics most frequently used as food contact materials due to their low cost and low reactivity. However, polyolefins are quite sensitive to oxidation and require to be stabilized by blending with antioxidant additives to inhibit or retard oxidative degradation. The vast majority of commercial available antioxidants are low molecular weight derivatives of sterically hindered monohydroxy phenols. Since their chemical structure is quite different from that of the non polar polymer matrix, two problems can be envisaged: i) the poor solubility of the antioxidants into the polyolefin matrix, which can induce aggregation of the stabilizers and an inhomogeneous distribution; ii) the mobility and volatility of the antioxidants, that can lead to their loss by migration or diffusion from the polyolefin matrix. Aim of this project is the synthesis of functionalized olefins bearing an antioxidant and/or a HALS (Hindered Amine Light Stabilizers) Functional Unit (FU) moiety separated from the double bond by methylene spacers of different lengths. These monomers can be employed as comonomers with ethylene (or propylene) to obtain very stable and solid macromolecular additives where the stabilizers FUs are covalently bonded to the polymeric chains. Such macromolecular additives are, in turn, used as masterbatch for the preparation of non-releasing polymeric films for food packaging [2]. [1] S. Al-Malaika, In: Comprehensive Polymer Science, G. Allen, J. C. Bevington, Eds., Pergamon Press, New York 1989, Vol. 6,539. [2] a) Sacchi, M.C.; Cogliati, C.; Losio, S.; Costa, G.; Stagnaro, P.; Menichetti, S.; Viglianisi, C. Macromol. Symposia, 2007, 260, 21. b) Menichetti, S; Viglianisi, C.; Liguori, F.; Cogliati, C.; Boragno, L.; Stagnaro, P.; Losio, S.; Sacchi, C. Journal of Polymer Science, Part A: Polymer Chemistry 2008,46, 6393.

Synthesis of functionalized olefins for the preparation of polymeric additives for food packaging / Menichetti, S; Viglianisi, C; Sacchi, M C; Losio, S; Stagnaro, P; Limbo, S. - STAMPA. - (2011), pp. 884-884. (Intervento presentato al convegno XXIV Congresso Nazionale della Società Chimica Italiana tenutosi a Lecce nel 11-16 settembre 2011).

Synthesis of functionalized olefins for the preparation of polymeric additives for food packaging

MENICHETTI, STEFANO;VIGLIANISI, CATERINA;
2011

Abstract

Polyolefins are the plastics most frequently used as food contact materials due to their low cost and low reactivity. However, polyolefins are quite sensitive to oxidation and require to be stabilized by blending with antioxidant additives to inhibit or retard oxidative degradation. The vast majority of commercial available antioxidants are low molecular weight derivatives of sterically hindered monohydroxy phenols. Since their chemical structure is quite different from that of the non polar polymer matrix, two problems can be envisaged: i) the poor solubility of the antioxidants into the polyolefin matrix, which can induce aggregation of the stabilizers and an inhomogeneous distribution; ii) the mobility and volatility of the antioxidants, that can lead to their loss by migration or diffusion from the polyolefin matrix. Aim of this project is the synthesis of functionalized olefins bearing an antioxidant and/or a HALS (Hindered Amine Light Stabilizers) Functional Unit (FU) moiety separated from the double bond by methylene spacers of different lengths. These monomers can be employed as comonomers with ethylene (or propylene) to obtain very stable and solid macromolecular additives where the stabilizers FUs are covalently bonded to the polymeric chains. Such macromolecular additives are, in turn, used as masterbatch for the preparation of non-releasing polymeric films for food packaging [2]. [1] S. Al-Malaika, In: Comprehensive Polymer Science, G. Allen, J. C. Bevington, Eds., Pergamon Press, New York 1989, Vol. 6,539. [2] a) Sacchi, M.C.; Cogliati, C.; Losio, S.; Costa, G.; Stagnaro, P.; Menichetti, S.; Viglianisi, C. Macromol. Symposia, 2007, 260, 21. b) Menichetti, S; Viglianisi, C.; Liguori, F.; Cogliati, C.; Boragno, L.; Stagnaro, P.; Losio, S.; Sacchi, C. Journal of Polymer Science, Part A: Polymer Chemistry 2008,46, 6393.
2011
XXIV Congresso Nazionale della Società Chimica Italiana, Lecce, Italy, 11-16 settembre 2011
XXIV Congresso Nazionale della Società Chimica Italiana
Lecce
Menichetti, S; Viglianisi, C; Sacchi, M C; Losio, S; Stagnaro, P; Limbo, S
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1055064
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