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Images of the in-situ retardation measurements at the tip of the tear: (a) video capture, (b) 2-D mapping of the as-molded film, (c) 2-D mapping of the film-absorbed moisture after 6 h in a humidity chamber, (d) 2-D mapping of the film annealed at 100 • C for 2 h under reduced pressure conditions.
Source publication
Compared with polyolefins that are used as single-use plastics, polylactic acid (PLA) has a lower tear strength in films. The relationship between the tear strength and the higher-order structure of films was investigated using PLA films that absorbed moisture at 30 °C and 95% relative humidity (RH) or that had been annealed under reduced pressure...
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The essential work of fracture (EWF) and Izod/Charpy impact tests have been used to investigate the fracture toughness in the plane stress of brittle polymers. In this paper, we had three goals: first, we aimed to employ how to estimate PLA toughness in different geometries; then, we proposed to compare Izod and Charpy Impact toughness in the same...
Citations
... The high molecular weight of PLA gives a high potential to be biodegradable and degrades quickly under specific temperature and humidity conditions. Other advantages of PLA properties are a high degree of transparency, high crystallinity to amorphous nature, and a glass transition temperature between 63.6 and 33.8 • C (Su et al., 2019;Valencia-Barragán et al., 2022). The rate of deterioration of the whole polymer depends on the initial crystallinity and monomer concentration, with the greatest monomer content exhibiting the lowest degradation because of its highly crystalline structure. ...
The development of biodegradable packaging is a challenge, as conventional plastics have many advantages in terms of high flexibility, transparency, low cost, strong mechanical characteristics, and high resistance to heat compared with most biodegradable plastics. The quality of biodegradable materials and the research needed for their improvement for meat packaging were critically evaluated in this study. In terms of sustainability, biodegradable packagings are more sustainable than conventional plastics; however, most of them contain unsustainable chemical additives. Cellulose showed a high potential for meat preservation due to high moisture control. Polyhydroxyalkanoates and polylactic acid (PLA) are renewable materials that have been recently introduced to the market, but their application in meat products is still limited. To be classified as an edible film, the mechanical properties and acceptable control over gas and moisture exchange need to be improved. PLA and cellulose‐based films possess the advantage of protection against oxygen and water permeation; however, the addition of functional substances plays an important role in their effects on the foods. Furthermore, the use of packaging materials is increasing due to consumer demand for natural high‐quality food packaging that serves functions such as extended shelf‐life and contamination protection. To support the importance moving toward biodegradable packaging for meat, this review presented novel perspectives regarding ecological impacts, commercial status, and consumer perspectives. Those aspects are then evaluated with the specific consideration of regulations and perspective in the European Union (EU) for employing renewable and ecological meat packaging materials. This review also helps to highlight the situation regarding biodegradable food packaging for meat in the EU specifically.
... [1]. (B) Images of the in situ retardation measurements at the tip of the tear for the polylactic acid-based film developed in Yutaka et al. [2]. (C) Schematic overview of the bioadhesive formulation and application in Céspedes-Valenzuela et al. [3]. ...
The need to find suitable biomaterials and procedures from alternative products able to imitate or even enhance the performance of currently used products has become an important focus of research today due to the depletion of non-renewable resources and the increasing concern related to climate change, sustainability and environmental preservation [...]
