Publication detail
Morphology and thermal degradation studies of PHB/acetylated lignin foils
KOVALČÍK, A. KOVÁŘ, J. KRZYŽÁNEK, V. MACHOVSKÝ, M. MÁROVÁ, I.
Original Title
Morphology and thermal degradation studies of PHB/acetylated lignin foils
Type
abstract
Language
English
Original Abstract
Poly(3-hydroxybutyrate) (PHB) is biopolymer with the advantages including bio-origin, biocompatibility, and biodegradability. Unfortunately, rheological and mechanical properties of PHB are influenced by the range of thermal degradation occurred during polymer processing. This work takes advantage of acetylated lignin reinforcing PHB composites that originate from grape bunches or seeds. Lignin was isolated by formic acid/ acetic acid. PHB/acetylated lignin composites were prepared by solution casting followed by thermoforming. The solubility and compatibility of lignin have been improved by acetylation. Neat PHB foil was very brittle reaching crystallinity of 70 %. Such high crystallinity causes high brittleness, which is not suitable for foils with packaging application. Lignin is a rigid highly cross-linked natural polymer consisting of phenylpropane units with no plasticizing effect. We will present that there is a high potential for preparation of PHB/PHA blends to improve the flexibility of PHB/acetylated lignin foils. The decrease of brittleness correlates with the lower crystallinity degree. However, loss in crystallinity negative influenced the thermal stability of PHB/PHA foils. The admixture of 50% PHA decreased the onset of thermal degradation about 40°C. It was proved that the incorporation of acetylated lignin in the concentration of 1 – 10 wt% increased the thermal stability of PHB/PHA blends about 30 - 40°C. The results indicate that PHB/PHA/acetylated foils with modified crystallization and improved flexibility might be applied in single-use packaging. It can be concluded that lignin isolated from winery waste from South Moravian region can be utilized as the active additive, modifying the degradation process of PHB/PHA blends.
Keywords
Biopolymers; Lignin, Polyhydroxyalkanoates, Thermal stability
Authors
KOVALČÍK, A.; KOVÁŘ, J.; KRZYŽÁNEK, V.; MACHOVSKÝ, M.; MÁROVÁ, I.
Released
5. 5. 2019
Publisher
Frontiers in Polymer Science
Location
Budapest
Pages from
1
Pages to
1
Pages count
1
BibTex
@misc{BUT157320,
author="KOVALČÍK, A. and KOVÁŘ, J. and KRZYŽÁNEK, V. and MACHOVSKÝ, M. and MÁROVÁ, I.",
title="Morphology and thermal degradation studies of PHB/acetylated lignin foils",
year="2019",
pages="1--1",
publisher="Frontiers in Polymer Science",
address="Budapest",
note="abstract"
}Documents