The antioxidant effect in controlling thermal degradation of a LDPE blow film

Francesco Paolo La Mantia, Graziana Carianni, Mariani

Risultato della ricerca: Article

8 Citazioni (Scopus)

Abstract

It is well known that antioxidants are widely used to prevent thermal degradation of high density and linear low density polyethylene. Antioxidants are not always present in low density polyethylene and only small amounts are usually added to these resins. In this work the effect of an antioxidant system on a low density resin having MFI (190 °C/2.16 kg)=2 g/10′ and density 0.9230 g/cm3 has been studied. Its effect on melt viscosity has been studied by means of a batch mixer and the torque vs time behaviour has been analysed. The results show that a maximum in the torque vs time curve can be seen for the material containing antioxidant. In contrast, the material without antioxidant does not show any maximum in the torque vs time curve and, after a certain time, directly undergoes chain scission. The presence of the antioxidant in a low density polyethylene seems to change the kinetics of two competitive phenomena: long chain branching formation/crosslinking and chain scissions. The antioxidant works essentially by stopping the peroxides formation. This effect slows the molecular weight decrease but does not influence long chain branching formation or crosslinking. © 2004 Elsevier Ltd. All rights reserved.
Lingua originaleEnglish
pagine (da-a)1003-1007
Numero di pagine5
RivistaPolymer Degradation and Stability
Volume85
Stato di pubblicazionePublished - 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Chemistry
  • Polymers and Plastics
  • Mechanics of Materials

Cita questo

The antioxidant effect in controlling thermal degradation of a LDPE blow film. / La Mantia, Francesco Paolo; Carianni, Graziana; Mariani.

In: Polymer Degradation and Stability, Vol. 85, 2004, pag. 1003-1007.

Risultato della ricerca: Article

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abstract = "It is well known that antioxidants are widely used to prevent thermal degradation of high density and linear low density polyethylene. Antioxidants are not always present in low density polyethylene and only small amounts are usually added to these resins. In this work the effect of an antioxidant system on a low density resin having MFI (190 °C/2.16 kg)=2 g/10′ and density 0.9230 g/cm3 has been studied. Its effect on melt viscosity has been studied by means of a batch mixer and the torque vs time behaviour has been analysed. The results show that a maximum in the torque vs time curve can be seen for the material containing antioxidant. In contrast, the material without antioxidant does not show any maximum in the torque vs time curve and, after a certain time, directly undergoes chain scission. The presence of the antioxidant in a low density polyethylene seems to change the kinetics of two competitive phenomena: long chain branching formation/crosslinking and chain scissions. The antioxidant works essentially by stopping the peroxides formation. This effect slows the molecular weight decrease but does not influence long chain branching formation or crosslinking. {\circledC} 2004 Elsevier Ltd. All rights reserved.",
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AU - La Mantia, Francesco Paolo

AU - Carianni, Graziana

AU - Mariani, null

PY - 2004

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N2 - It is well known that antioxidants are widely used to prevent thermal degradation of high density and linear low density polyethylene. Antioxidants are not always present in low density polyethylene and only small amounts are usually added to these resins. In this work the effect of an antioxidant system on a low density resin having MFI (190 °C/2.16 kg)=2 g/10′ and density 0.9230 g/cm3 has been studied. Its effect on melt viscosity has been studied by means of a batch mixer and the torque vs time behaviour has been analysed. The results show that a maximum in the torque vs time curve can be seen for the material containing antioxidant. In contrast, the material without antioxidant does not show any maximum in the torque vs time curve and, after a certain time, directly undergoes chain scission. The presence of the antioxidant in a low density polyethylene seems to change the kinetics of two competitive phenomena: long chain branching formation/crosslinking and chain scissions. The antioxidant works essentially by stopping the peroxides formation. This effect slows the molecular weight decrease but does not influence long chain branching formation or crosslinking. © 2004 Elsevier Ltd. All rights reserved.

AB - It is well known that antioxidants are widely used to prevent thermal degradation of high density and linear low density polyethylene. Antioxidants are not always present in low density polyethylene and only small amounts are usually added to these resins. In this work the effect of an antioxidant system on a low density resin having MFI (190 °C/2.16 kg)=2 g/10′ and density 0.9230 g/cm3 has been studied. Its effect on melt viscosity has been studied by means of a batch mixer and the torque vs time behaviour has been analysed. The results show that a maximum in the torque vs time curve can be seen for the material containing antioxidant. In contrast, the material without antioxidant does not show any maximum in the torque vs time curve and, after a certain time, directly undergoes chain scission. The presence of the antioxidant in a low density polyethylene seems to change the kinetics of two competitive phenomena: long chain branching formation/crosslinking and chain scissions. The antioxidant works essentially by stopping the peroxides formation. This effect slows the molecular weight decrease but does not influence long chain branching formation or crosslinking. © 2004 Elsevier Ltd. All rights reserved.

KW - Low density polyethylene, Long chain branching, Chain scission, Antioxidant

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JO - Polymer Degradation and Stability

JF - Polymer Degradation and Stability

SN - 0141-3910

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