File Name: polylactic acid synthesis properties and applications .zip
Polylactic acid PLA —based polymers are ubiquitous in the biomedical field thanks to their combination of attractive peculiarities: biocompatibility degradation products do not elicit critical responses and are easily metabolized by the body , hydrolytic degradation in situ , tailorable properties, and well-established processing technologies. This led to the development of several applications, such as bone fixation screws, bioresorbable suture threads, and stent coating, just to name a few. Nanomedicine could not be unconcerned by PLA-based materials as well, where their use for the synthesis of nanocarriers for the targeted delivery of hydrophobic drugs emerged as a new promising application.
E-mail: ykimura kit. Among the bio-based polymers developed so far, PLA polymers and their derivatives stand at the forefront of practical use and are currently manufactured. PLLA obtained from naturally occurring l -lactic acid is generally produced and utilized on an industrial scale. Two synthetic routes to PLLA have been known: one is the ROP of l -lactide and the other is the direct polycondensation of l -lactic acid. In the former method, various polymerization mechanisms have been demonstrated. Among them, bulk polymerization of l -lactide monomer in the presence of tin octoate is favoured to avoid racemization and trans-esterification chain scrambling.
PLA has become a popular material due to it being economically produced from renewable resources. In , PLA had the second highest consumption volume of any bioplastic of the world,  although it is still not a commodity polymer. Its widespread application has been hindered by numerous physical and processing shortcomings. The name "polylactic acid" does not comply with IUPAC standard nomenclature, and is potentially ambiguous or confusing, because PLA is not a polyacid polyelectrolyte , but rather a polyester. The monomer is typically made from fermented plant starch such as from corn , cassava , sugarcane or sugar beet pulp.
Polylactic acid PLA is one of the main components of biodegradable and biocompatible composites. Bacterial cellulose from kombucha membranes is an excellent candidate to be used as a natural filler of eco-composites because it is renewable, has low cost, low density, and acceptable specific strength properties, and is biodegradable. The study aimed to prepare composites of PLA and bacterial cellulose to produce a biodegradable and compostable material. The bacterial microcellulose was obtained from kombucha membranes and blended with PLA by extrusion. We characterized the PLA, bacterial microcellulose, and composites to ascertain their size and aspect, degree of crystallinity, distribution of the cellulose into PLA, and their mechanical properties.
Polylactic Acid PLA is the first viable thermoplastic that can be produced from a plant-based feedstock such as corn or sugar cane, and yet be processed by the conventional melt processing technologies. At the same time, Polylactic Acid is produced at the largest industrial scale of all biodegradable polymers. It is being used in biomedical applications, for bottle production and in compostable food packaging. It is also being evaluated as a material for tissue engineering.
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Polylactic acid PLA is a biodegradable thermoplastic polyester. In , PLA became the second highest consumed bioplastic in the world due to its wide application.
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Keywords Polylactic acid, Biopolymer, Biodegradable, Properties, Synthesis, Process, Application, Packaging, Biomedical INTRODUCTION Tailoring new.Hannah R. 07.05.2021 at 11:47
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The mechanical properties of PLA can vary according to various parameters, such as crystallinity, polymer structure and molecular weight, material formulation .