Improvement of the Thermo-Oxidative Stability of Biobased Poly(butylene succinate) (PBS) Using Biogenic Wine By-Products as Sustainable Functional Fillers

Abstract

Biobased poly(butylene succinate) (PBS) represents one promising sustainable alternative to petroleum-based polymers. Its sensitivity to thermo-oxidative degradation is one reason for its limited application. In this research, two different varieties of wine grape pomaces (WPs) were investigated as fully biobased stabilizers. WPs were prepared via simultaneous drying and grinding to be used as bio-additives or functional fillers at higher filling rates. The by-products were characterized in terms of composition and relative moisture, in addition to particle size distribution analysis, TGA, and assays to determine the total phenolic content and the antioxidant activity. Biobased PBS was processed with a twin-screw compounder with WP contents up to 20 wt.-%. The thermal and mechanical properties of the compounds were investigated with DSC, TGA, and tensile tests using injection-molded specimens. The thermo-oxidative stability was determined using dynamic OIT and oxidative TGA measurements. While the characteristic thermal properties of the materials remained almost unchanged, the mechanical properties were altered within expected ranges. The analysis of the thermo-oxidative stability revealed WP as an efficient stabilizer for biobased PBS. This research shows that WP, as a low-cost and biobased stabilizer, improves the thermo-oxidative stability of biobased PBS while maintaining its key properties for processing and technical applications.

Laccase-Mediated Oxidation of Phenolic Compounds from Wine Lees Extract towards the Synthesis of Polymers with Potential Applications in Food Packaging

“…300 °C, cellulose at ca. 340 °C, and lignin after 400 °C [56,57]. Another noticeable difference between the extract and the polymeric products is their decomposition profile (Figure 6b).…”

Influence of Coffee Variety and Processing on the Properties of Parchments as Functional Bioadditives for Biobased Poly(butylene succinate) Composites

“…The total phenolic content (TPC) was determined with FC-Assays according to Singleton et al [30] and the radical scavenging properties were determined with DPPH assays according to Brand-Williams et al [31] and ABTS assays according to the procedure of Re et al [32]. A detailed description of the used and modified Assay procedure can be seen at Hiller et al [33]. For the extraction, 1 g of each PMT was diluted in glass test tubes with 10 mL of 50/50 water/bioethanol and stored for 60 min in a US bath (Allpax GmbH and Co. KG, Papenburg, Germany) preheated at 40 • C. The temperature of the US bath increased to 52 • C after 30 min and 56 • C after 60 min.…”

Preparation and Spectroscopic, Thermal, and Mechanical Characterization of Biocomposites of Poly(butylene succinate) and Onion Peels or Durum Wheat Bran

“…The main way to reduce the price of biodegradable polymer materials as well as to modify their properties is to use natural fillers such as wood chips [9], ground bran of wheat cereals [10][11][12], rice [13], ground coffee beans [14][15][16], shells of various nuts [17][18][19], natural fibers [20] (cellulose, hemp, flax, sugar cane, bamboo) and many other types of agricultural waste [21][22][23][24]. The latest works published in 2023 year on PBS compositions concerns the use of fillers such as biochar [25][26][27], flax and pineapple leaf fiber [28,29], graphene nanoplatelets and starch-based materials [30], biogenic wine by-products [31], plant fibers (jute, kenaf, flax, and hemp) [32], rice straw fiber [33], and nanofibrillated cellulose [34].…”