The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Effect of additives on the melt rheology and thermal degradation of poly[(R)-3-hydroxybutyric acid]

På svenska

Author

  • Carlos Rodriguez Arza
  • Patric Jannasch
  • Peter Johansson
  • Per Magnusson
  • Alan Werker
  • Frans Maurer

Summary, in English

Thermal degradation of poly[(R)−3-hydroxybutyric acid] (PHB) during melt mixing results in random chain scission that produces shorter polymer chains containing crotonic and carboxyl end groups. One way of preventing this serious reduction of molar mass is to add agents that react with at least two of the newly generated end groups. Different types of commercially available additives known to react with carboxyl group, namely bis(3,4-epoxycyclohexylmethyl) adipate (BECMA), 2,2'-bis(2-oxazoline) (BOX), trimethylolpropane tris(2-methyl-1-aziridinepropionate) (PETAP), triphenyl phosphate (TPP), tris(nonylphenyl) phosphate (TNPP), polycarbodiimide (PCDI), and poly(methyl metharylate-co-glycidyl methacrylate) (GMA.MMA) were mixed with PHB by cocasting from solution in chloroform. Dynamic rheology as well as measurements of molar masses before and after dynamic analysis was used to evaluate the effect of the additives on the melt stability of PHB. Measurements of the dynamic shear modulus and the molar mass of molten PHB with the additives PCDI and GMA.MMA showed a minor improvement on the thermal stability. Furthermore, TPP and TNPP did not affect the thermal stability of PHB, whereas the presence of BECMA, BOX, and PETAP gave a strong decrease of the dynamic modulus compared with neat PHB.

Publishing year

2015

Language

English

Pages

1-41836

Publication/Series

Journal of Applied Polymer Science

Volume

132

Issue

15

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Chemical Sciences

Keywords

  • Dynamic shear modulus.
  • Thermal stability
  • Rheology
  • Polyhydroxyalkanoates
  • Biodegradation
  • Degradation

Status

Published

ISBN/ISSN/Other

  • ISSN: 1097-4628