Sofia Martinez
Polylactic acid, also known as poly(lactic acid) or polylactide (PLA), is a plastic material. PLA is a biodegradable bioplastic produced from renewable sources such as corn starch, sugar cane, and sugar beet. It is commonly used in 3D printing and for disposable food packaging. PLA is a popular alternative to traditional plastics due to its renewability, compostability, and eco-friendly production process. However, there are concerns about the time it takes for PLA to decompose in landfills and the lack of infrastructure for proper composting.
| Characteristics | Values |
|---|---|
| Full Form | Polylactic Acid |
| Other Names | Poly(lactic acid), Polylactide |
| Type of Plastic | Bioplastic |
| Composition | Polyester, Polymer containing ester group |
| Monomers | Lactic acid, Lactide |
| Lactic Acid Source | Corn starch, Cassava roots, Sugarcane, Sugar beet pulp |
| Biodegradability | Biodegradable under appropriate composting conditions |
| Compostability | Certified industrially compostable to Australian and European Standards (AS4736 and EN13432) |
| Decomposition Products | Water, Carbon dioxide, Composite |
| Decomposition Time | 3-6 months |
| Biocompatibility | Non-toxic to humans |
| Mechanical Properties | High strength, Low thermal expansion, Good layer adhesion, Poor heat resistance |
| Printing Process | Does not require a heated print bed, Extruder temperature between 190-220 °C |
| Use Cases | Food packaging, Medical implants, Injection moulding, 3D printing, Clothing fibres |
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What You'll Learn
PLA is a bioplastic made from renewable resources
Polylactic acid, also known as poly(lactic acid) or polylactide (PLA), is a bioplastic made from renewable resources. It is a thermoplastic polyester or polyhydroxyalkanoate with the backbone formula (C3H4O2) n or [–C(CH3)HC(=O)O–] n. PLA is produced by the bacterial fermentation of plant starches such as corn, cassava, sugarcane, or sugar beet. This process results in lactic acid, which then undergoes polymerization to create PLA.
PLA is a popular material due to its economic production and use in compostable products. It is also biodegradable when processed in industrial composting facilities, breaking down into water, carbon dioxide, and composite in six months or less. However, there are limited composting facilities that accept PLA, and it can take a long time to break down in landfills.
PLA is widely used in various industries, including medical devices, food packaging, and 3D printing applications. It is one of the most widely used 3D printing filaments due to its low melting point, high strength, low thermal expansion, and good layer adhesion. However, it possesses poor heat resistance.
PLA is also used in disposable cutlery, clothing fibres, and medical implants like stents and implantable drug dispensers. It is non-toxic to humans and decomposes into harmless lactic acid.
Overall, PLA is a bioplastic with a wide range of applications, made from renewable resources through a sustainable process.
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It is compostable and biodegradable under certain conditions
PLA plastic, or polylactic acid, is a biodegradable plastic made from renewable sources. It is commonly made from plant starches such as corn starch, sugar cane, sugar beet, and cassava. These plants are fermented to produce lactic acid, which then undergoes polymerization to create PLA.
While PLA is compostable and biodegradable, it requires certain conditions to break down. It is certified as industrially compostable to Australian and European Standards (AS4736 and EN13432) and will break down within 12 weeks under commercial composting conditions. However, it is not certified for home composting (AS5810). This means that proper disposal of PLA plastics requires sending them to a commercial composting facility, which uses a highly controlled environment to accelerate decomposition.
The process of composting PLA in these facilities can take up to 90 days, and the facilities themselves are scarce. When not diverted to these industrial compost facilities, PLA can take a long time to break down, similar to regular plastics. In landfills, where many PLA products may end up, the plastic can take hundreds of years to decompose.
Despite these drawbacks, PLA is still a more environmentally friendly option than traditional plastics. It uses 65% less energy and generates 63% fewer greenhouse gases during production. Additionally, when incinerated, PLA does not emit toxic fumes, unlike PET and other petroleum-based plastics.
Overall, while PLA is compostable and biodegradable, it requires specialized industrial composting facilities to break down effectively, and the lack of accessibility to these facilities may impact its environmental benefits.
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PLA is a thermoplastic polyester
Polylactic acid, also known as poly(lactic acid) or polylactide (PLA), is a thermoplastic polyester. It is a plastic material with a backbone formula of (C3H4O2) n or [–C(CH3)HC(=O)O–] n. PLA is obtained by condensing lactic acid C(CH3)(OH)HCOOH with a loss of water, which is the origin of its name. It can also be prepared by the ring-opening polymerization of lactide [–C(CH3)HC(=O)O–] 2, the cyclic dimer of the basic repeating unit.
PLA is a polyester, which is a polymer containing ester groups and two possible monomers or 'building blocks': lactic acid and lactide. Lactic acid can be produced by the bacterial fermentation of a carbohydrate source like corn starch, cassava roots, sugarcane, or sugar beet pulp under controlled conditions. The use of agricultural produce and crop residue as alternative carbohydrate sources makes the process sustainable and renewable on an industrial scale.
PLA is a biodegradable plastic made from renewable sources. It is commonly made from materials such as corn starch, sugarcane, and sugar beet, which are fermented to produce lactic acid. This then undergoes polymerization to create PLA. As a thermoplastic, it is similar to polypropylene (PP), polyethylene (PE), and polystyrene (PS). It is manufactured using techniques such as extrusion, injection molding, thermoforming, and 3D printing using PLA filament.
PLA is widely used in various industries due to its biocompatibility and good mechanical properties. It is easy to process and is used in medical devices, food packaging, disposable cutlery, and clothing fibers. PLA is also one of the most popular 3D printing filaments for fused deposition modeling (FDM) due to its low melting point, high strength, low thermal expansion, and good layer adhesion. However, it possesses poor heat resistance unless annealed.
PLA has become a popular material due to its economic production from renewable resources and its potential for compostable products. It is certified industrially compostable and can break down within twelve weeks under commercial composting conditions, making it a more environmentally friendly choice than traditional plastics.
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It is widely used in 3D printing
Polylactic Acid, commonly known as PLA, is one of the most popular materials used in 3D printing. It is the default filament of choice for most extrusion-based 3D printers because it can be printed at a low temperature and does not require a heated bed. PLA is a great first material to use when learning about 3D printing because it is easy to print, very inexpensive, and creates parts that can be used for a wide variety of applications. It is also one of the most environmentally friendly filaments on the market today.
PLA is derived from crops such as corn and sugarcane, making it a renewable and biodegradable resource. This also allows the plastic to give off a sweet aroma during printing. The ease of use of PLA makes it a popular choice for many industries, including the automotive industry, where it can be used to create car accessories or dashboard elements. It is also used in the consumer goods industry to create end-use products such as accessories for bags, shoes, jewellery, and buttons.
PLA is well-suited for tooling applications, with companies like Gerhard Schubert GmbH using materials like PLA+ to create new tools for its packaging machines. Heineken also uses Ultimaker Tough PLA to create customized tools for its bottling plant. The versatility of PLA makes it ideal for rapid prototyping, as it can be used to test different designs and concepts quickly and inexpensively.
Another advantage of PLA is its ability to generate a high level of detail, making it appealing to architects who use it to create to-scale models of their designs. Architects can use these models to explain complex concepts to clients or for educational projects. The Netherlands' Naturalis Biodiversity Center uses PLA to recreate missing parts of dinosaur skeletons, providing a previously impossible glimpse of the past to museum visitors.
Overall, PLA is widely used in 3D printing due to its ease of use, versatility, environmental benefits, and ability to produce high-quality, detailed prints.
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PLA has advantages over conventional plastics
Polylactic acid, also known as poly(lactic acid) or polylactide (PLA), is a plastic material with several advantages over conventional plastics. Firstly, it is a biodegradable material made from renewable sources such as corn starch, sugar cane, and sugar beet. These plants are fermented to produce lactic acid, which undergoes polymerization to create PLA. This makes PLA environmentally friendly and sustainable, as it does not depend on petroleum or other fossil fuels for its production.
Secondly, PLA has a low melting point, making it ideal for recycling. While PLA can contaminate the conventional plastics recycling process due to its lower melting point, it can be recycled through a thermal depolymerization process or hydrolysis, breaking it down into its original monomer. This monomer solution can then be purified and used for further PLA production without any loss of quality.
Thirdly, PLA is certified industrially compostable to Australian and European Standards (AS4736, EN13432), meaning it will break down within twelve weeks under commercial composting conditions. This is a significant advantage over traditional plastics, which can take centuries to break down, eventually creating microplastics that can harm the environment.
Additionally, PLA possesses good mechanical properties, such as high strength, low thermal expansion, and good layer adhesion. These characteristics make it a popular choice for 3D printing and various consumer products, including disposable tableware, cutlery, and electronics housings.
However, it is important to note that PLA also has some disadvantages. For instance, it is more expensive than conventional plastics due to the number of steps required in its production process. Furthermore, its poor heat resistance limits its use in certain applications that require high-stress levels. Despite these drawbacks, PLA's advantages over conventional plastics make it a promising alternative, especially with ongoing improvements in technology and production methods.
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Frequently asked questions
PLA, or polylactic acid, is a bioplastic produced from plant starches using a sustainable process. It is a thermoplastic polyester with the backbone formula (C3H4O2)n or [–C(CH3)HC(=O)O–]n.
PLA filament is made from renewable resources like plants. Specifically, it is commonly made from materials such as corn starch, sugar cane, and sugar beet.
The synthesis of PLA is most commonly done via ring-opening polymerization. The plants are fermented to produce lactic acid, which then goes through the process of polymerization to create PLA.
PLA is biodegradable, compostable, and made from renewable resources. It is also easy to process and biocompatible. Compared to its petroleum-based counterparts, PLA boasts great eco-benefits, using 65% less energy and generating 63% fewer greenhouse gases.
PLA filament is widely used in various industries due to its biocompatibility and good mechanical properties. It is used for medical implants, food packaging, disposable cutlery, and 3D printing applications.
