Study of PBAT Photostabilization with Ultraviolet Absorber in Combination with Hindered Amine Light Stabilizer and Vitamin E, Aiming Mulching Film Application

  • Patrícia Moraes Sinohara Souza
  • Ana Rita Morales
  • Elisabete Maria Saraiva Sanchez
  • Lucia Helena Innocentini Mei
Original Paper
  • 17 Downloads

Abstract

This work evaluated two combinations of additives, i.e. “carbon black and hindered amine light stabilizer (HALS)” and “carbon black and vitamin E” to prevent photodegradation of poly(butylene adipate-co-terephthalate) (PBAT) aiming its application as mulch films. A 22 factorial rotatable central composite design (α = 1.414) with three central points was conducted. Five different concentrations for each additive were used (0.1, 0.5, 1.0, 1.5 and 2.0% in mass). The formulations were exposed in an environmental simulator to radiation and condensation cycles. The both combination did not avoid the gel formation but its action reduced PBAT chain scission process during photodegradation. Nevertheless, comparing the two different combinations with carbon black, HALS additive was more efficient than vitamin E to minimize the reduction on tensile strength and elongation. The chain scission and crosslinking processes were evaluated by chain scission distribution function. The chain scission was the predominant process during photodegradation of pure PBAT and it was possibly favored by hydrolysis during condensation cycles in the accelerated aging test. It was verified that higher concentrations of carbon black in the formulations led to a reduction on light transmission in both experimental designs. Considering the responses of studied factors on mechanical properties and light transmission it was possible to identify the most promising formulations for application in mulch films, which correspond to 1.5% (weight) for each additive.

Keywords

Poly(butylene adipate co-terephthalate) Photodegradation Chain scission Crosslink Mulching 

Notes

Acknowledgements

The authors are grateful to FAPESP (Process Number 2016/11199-0 and 2016-10777-0) by the financial support.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Materials Engineering and Bioprocess, School of Chemical EngineeringState University of Campinas (UNICAMP)CampinasBrazil
  2. 2.CampinasBrazil

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