Publication detail

Processing stabilization of poly(3-hydroxybutyrate)/poly(lactic acid) blends with oligomeric carbodiimide

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

Original Title

Processing stabilization of poly(3-hydroxybutyrate)/poly(lactic acid) blends with oligomeric carbodiimide

Type

journal article in Scopus

Language

English

Original Abstract

Reactivity of five reactive agents with two biopolyesters, poly(3-hydroxybutyrate) (PHB) and poly(lactic acid) (PLA), was studied in situ during processing in laboratory kneader with simultaneous recording of a melt torque. Among them only Raschig, an oligomeric carbodiimide based additive, was proven to enhance melt viscosity of both. In order to find out the most efficient level of this additive for stabilizing of both polymers and PHB/PLA (70/30 w/w) blend, different concentrations were studied by means of melt torque monitoring, rheology time tests and gel permeation chromatography. Results showed the same trend for neat polymers and their blend. Addition of more than 0.5 % wt. did not have any further positive effect on molecular weight or complex viscosity of the melt. Higher amount is not consumed during the reaction and is left in the sample. Therefore, this amount was used for processing stability studies on PHB/PLA blends by subsequent extrusion cycles. Melt volume-flow rate of extruded samples was obtained and results showed lower values for all stabilized blends comparing to the first extrusion sample of non-stabilized blend. At the same, stability of the blends is secured up to the third extrusion cycle.

Keywords

Poly(3-hydroxybutyrate), poly(lactic acid), carbodiimide, stabilization, reactive extrusion

Authors

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

Released

4. 1. 2019

Publisher

Scientific.net

ISBN

1662-9752

Periodical

Materials Science Forum

Year of study

955

Number

2019

State

Swiss Confederation

Pages from

7

Pages to

12

Pages count

6

URL

https://www.scientific.net/MSF.955.7

BibTex

@article{BUT152028,
  author="Veronika {Melčová} and Radek {Přikryl} and Přemysl {Menčík} and Jiří {Tocháček}",
  title="Processing stabilization of poly(3-hydroxybutyrate)/poly(lactic acid) blends with oligomeric carbodiimide",
  journal="Materials Science Forum",
  year="2019",
  volume="955",
  number="2019",
  pages="7--12",
  doi="10.4028/www.scientific.net/MSF.955.7",
  issn="1662-9752",
  url="https://www.scientific.net/MSF.955.7"
}