Poly(lactic acid)/modified gum arabic based bionanocomposite films: Thermal degradation kinetics

This study was aimed to identify the best approach of incorporating cellulose nanocrystals (CNCs) into a poly(lactic acid) (PLA) matrix by examining two different CNC addition approaches. The first approach consisted of melt‐blending (MB) PLA and CNCs in a three‐piece internal mixer whereas the second method involved direct dry‐mixing of PLA and CNCs in a high intensity mixer. The compounded materials were then blown into films and compared in terms of particle dispersion, optical, thermal, molecular weight and barrier properties. Good distribution was achieved by both the direct dry‐ and MB methods. However, some agglomerations were still present that resulted in reduced transparency of the composite films. Furthermore, the PLA/CNC films thermally degraded during the blending processes indicated by the drop in their molecular weights due to chain scissions. More chain scissions occurred in melt‐blended (MB) films than the dry‐blended (DB) counterparts. The addition of only 1% CNCs into the PLA matrix by the direct dry‐ and MB approaches improved the water barrier properties of PLA films by 30% and 24%, and oxygen barrier properties by 60% and 39%, respectively. The inferior performance of the MB films compared to the direct DB counterparts could be attributed to more chain scissions in these films. Thus, the direct dry‐blending (DB) process appeared to be the better approach of incorporating CNCs into the PLA matrix. POLYM. ENG. SCI., 58:1965–1974, 2018. © 2017 Society of Plastics Engineers

Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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Performance of poly(lactic acid)/ cellulose nanocrystal composite blown films processed by two different compounding approaches

Karkhanis

Stark

Sabo

et al. 2017

“…The wide use of petroleum-based polymers have caused environmental concerns due to their non-biodegradability and increase in the waste accumulation. [6,7] Macromolecules such as polysaccharides, proteins, and lipids have been used to prepare new biodegradable materials for the food packaging industry, one of the largest consumers of plastic materials in the world. [8,9] In general, films of macromolecules derived from crops, including the chia mucilage, have promising physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Chia seeds to develop new biodegradable polymers for food packaging: Properties and biodegradability

Fernandes

Romani

Filipini

et al. 2020

Chia seeds are a promising raw material for the development of biodegradable and edible polymers due to their composition and properties. This study aimed to evaluate the effects of drying process of chia mucilage (oven and freeze‐drying) and the incorporation of chia oil in films for food packaging. The films were formed by casting using chia mucilage and glycerol. The polymers developed were evaluated by physicochemical properties, microstructure, thermal properties, and biodegradation. The drying process of mucilage and oil incorporation in films affected mainly mechanical and color properties. Freeze‐dried mucilage resulted in superior mechanical performance. Differences were caused by the effect of drying process in the molecular structure of chia mucilage and the incorporation of oil among the polymer chains. Chia mucilage films were completely soluble in water and biodegraded in a short time in soil. These films are promising biodegradable polymers for the development of eco‐friendly food packaging and edible sachets for small pre‐measured portions, preventing environment pollution and facilitating product consumption.

“…[ 1‐5 ] In comparison, synthetic polymers, such as poly(ε‐caprolactone) (PCL), poly(butylene succinate) (PBS), poly(lactic acid), poly(anhydrides), and poly(hydroxyl alkonates) are more commonly used in the tissue engineering field due to their easily tailorable mechanical properties and degradation rates. [ 6,7 ] These two groups of biodegradable polymers complement each other in their inherent properties, thus combining the two gives an opportunity to take benefits of each group's desired properties.…”

Section: Introductionmentioning

confidence: 99%

Characterization and in‐vitro analysis of poly(ε‐caprolactone)‐“Jackfruit” Mucilage blends for tissue engineering applications

Prakash

Lata

Martens

et al. 2020

Jackfruit mucilage (JM) obtained from the fruit, Artocarpus heterophyllus was melt blended with poly(ε‐caprolactone) (PCL). The physical properties of the blends with more than 60 wt% PCL were investigated. Depression in the equilibrium melting temperature (Tmo) and the presence of extinction rings in the spherulites of PCL in the blends confirmed miscibility of the two components. The carbonyl and the COC groups of PCL and JM were responsible for the interactions as identified by Fourier transform infrared spectroscopy. The thermal stability of PCL decreased marginally in the blends with increasing JM content. The scanning electron microscopy (SEM) images indicated that no phase separation occurred. Porosity and the mechanical strength of the blends decreased with increasing JM content. Blends exposed to porcine pancreatic lipase showed enzymatic degradation of JM but not PCL and SEM images showed holes in the sample indicative of selective degradation of JM. Cell growth inhibition technique using the L929 fibroblasts cells showed the degree of inhibition was dependent on the increasing JM content in the blends. Blends with low JM content have the potential to be used for increased cell viability while blends with high JM content can be used for the treatment of cancer.