Publication detail

The chances of thermooxidation stabilization of poly(3-hydroxybutyrate) during processing - a critical evaluation

TOCHÁČEK, J. PŘIKRYL, R. MENČÍK, P. MELČOVÁ, V. FIGALLA, S.

Original Title

The chances of thermooxidation stabilization of poly(3-hydroxybutyrate) during processing - a critical evaluation

Type

journal article in Web of Science

Language

English

Original Abstract

The performance of a series of thermo-oxidation stabilizers was investigated in poly(3-hydroxybutyrate) (PHB) during processing by multiple extrusion at 190°C. The issue was to find out if PHB may be processing stabilized or not. Phenols of different steric hindrance, phosphites, amine oxide, hydroxylamine, lactone, hindered amine and carbodiimide were tested as potential stabilizers and their efficiencies compared with a non-stabilized polymer as a reference. Data from multiple extrusion were evaluated using the processing degradation index (PDI) formerly designed for polypropylene. Changes in molecular weight were monitored as well. The results have shown that none of stabilizing structures, currently successfully used in other polymers, has the ability to protect PHB. This indirectly implies that no radical chain scission takes place during PHB processing, i.e. no thermo-oxidation takes place. Moreover, nearly all the tested structures acted as prodegradants in PHB, some of them very strong. The strongest ones contained P or N atoms with asymmetrical free electron pairs in their molecules that evidently speeded up the main degradation mechanism of PHB – thermally induced cis-elimination.

Keywords

poly(3-hydroxybutyrate), multiple extrusions, stabilization

Authors

TOCHÁČEK, J.; PŘIKRYL, R.; MENČÍK, P.; MELČOVÁ, V.; FIGALLA, S.

Released

26. 2. 2021

Publisher

Wiley

Location

Hoboken, New Jersey, USA

ISBN

1097-4628

Periodical

Journal of Applied Polymer Science

State

United States of America

Pages from

1

Pages to

10

Pages count

10

URL

https://onlinelibrary.wiley.com/doi/10.1002/app.50647

BibTex

@article{BUT169845,
  author="Jiří {Tocháček} and Radek {Přikryl} and Přemysl {Menčík} and Veronika {Melčová} and Silvestr {Figalla}",
  title="The chances of thermooxidation stabilization of poly(3-hydroxybutyrate) during processing - a critical evaluation",
  journal="Journal of Applied Polymer Science",
  year="2021",
  volume="0",
  number="0",
  pages="1--10",
  doi="10.1002/app.50647",
  issn="1097-4628",
  url="https://onlinelibrary.wiley.com/doi/10.1002/app.50647"
}

Documents

app.50647.pdf