PubMed: Development of Polylactic Acid Films with Alkali- and Acetylation-Treated Flax and Hemp Fillers via Solution Casting Technique

PubMed: Development of Polylactic Acid Films with Alkali- and Acetylation-Treated Flax and Hemp Fillers via Solution Casting Technique

Polymers (Basel). 2024 Apr 5;16(7):996. doi: 10.3390/polym16070996.

ABSTRACT

This study aims to enhance value addition to agricultural byproducts to produce composites by the solution casting technique. It is well known that PLA is moisture-sensitive and deforms at high temperatures, which limits its use in some applications. When blending with plant-based fibers, the weak point is the poor filler-matrix interface. For this reason, surface modification was carried out on hemp and flax fibers via acetylation and alkaline treatments. The fibers were milled to obtain two particle sizes of <75 μm and 149-210 were blended with poly (lactic) acid at different loadings (0, 2.5%, 5%, 10%, 20%, 30%) to form a composite film the films characterized for their spectroscopy, physical, mechanical properties. all specimens showed c-o o-h groups π-π interaction in untreated flaxfillers lignin phenolic rings films. it was noticed that maximum degradation temperature occurred 362.5 °c. highest wvps untreated, alkali-treated, acetylation-treated composites 20 × 10-7 g·m/m2 Pa·s (PLA/hemp30), 7.0 × 10-7 g·m/m2 Pa·s (PLA/hemp30), and 22 × 10-7 g·m/m2 Pa·s (PLA/hemp30), respectively. Increasing the filler content caused an increase in the color difference of the composite film compared with that of the neat PLA. Alkali-treated PLA/flax composites showed significant improvement in their tensile strength, elongation at break, and Young’s modulus at a 2.5 or 5% filler loading. An increase in the filler loadings caused a significant increase in the moisture absorbed, whereas the water contact angle decreased with an increasing filler concentration. Flax- and hemp-induced PLA-based composite films with 5 wt.% loadings showed a more stable compromise in all the examined properties and are expected to provide unique industrial applications with satisfactory performance.

PMID:38611254 | DOI:10.3390/polym16070996

https://pubmed.ncbi.nlm.nih.gov/38611254/?utm_source=Chrome&utm_medium=rss&utm_campaign=pubmed-2&utm_content=1Ds1JEbG0OWaBdqM3tTUGjkFhFGaOtMecPdpuvzbuubWi6d9Fn&fc=20231022105433&ff=20240413112427&v=2.18.0.post9+e462414 April 13, 2024 10:00 am