Omar Khalid
Polylactic acid (PLA), also known as corn plastic, is a popular alternative to traditional petroleum-based plastics. PLA is a polyester made from renewable biomass, typically from fermented plant starch like corn, cassava, sugarcane, sugar beet pulp, or tapioca root. It is used in a wide range of consumer products, such as disposable tableware, cutlery, housings for kitchen appliances, and electronics. PLA is certified industrially compostable and can be broken down into its original monomer through a thermal depolymerization process or hydrolysis. However, critics note that PLA has a slow rate of biodegradability and cannot be mixed with other plastics for recycling.
| Characteristics | Values |
|---|---|
| Material | Polylactic acid (PLA) |
| Made from | Renewable crops like corn, sugarcane, cassava, wheat, beets, potatoes |
| Process | Begins by isolating starch from crops using wet milling; starch undergoes hydrolysis to break it down into simple sugars such as glucose; glucose is then fermented by microorganisms to produce lactic acid; lactic acid is purified and concentrated, then converted into PLA plastic through Ring-Opening Polymerization (ROP) |
| Biodegradable | Yes, but slowly and under specific conditions (high temperatures and moisture levels in a controlled composting environment) |
| Carbon neutral | Yes |
| Toxic fumes when incinerated | No |
| FDA-approved | Yes, recognized as safe for food contact and packaging |
| Applications | 3D printing, containers, cups, lids, straws, bottles, medical devices, sutures, animal waste bags |
| Disposal | Cannot be recycled with other plastics; requires specialized facilities for chemical or enzymatic recycling or industrial composting |
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What You'll Learn
- Corn plastic is a non-petroleum material made by converting corn into polylactic acid (PLA)
- PLA is a popular alternative to traditional petroleum-based plastics and is carbon neutral
- PLA is used in a variety of consumer products, from cutlery to surfboards
- PLA is certified industrially compostable and will break down within twelve weeks
- Critics say PLA is not a panacea for the world's plastic waste problem due to its slow biodegradability
Corn plastic is a non-petroleum material made by converting corn into polylactic acid (PLA)
Corn plastic, also known as PLA, is a non-petroleum material made by converting corn into polylactic acid (PLA). PLA is a plastic substitute made from fermented plant starch, usually corn. It is a popular alternative to traditional petroleum-based plastics and is created by isolating starch from corn or other crops like sugarcane or cassava. The process involves soaking and grinding kernels to separate starch from fibre and protein. The starch then undergoes hydrolysis, breaking it down into simple sugars such as glucose through a reaction with water and enzymes.
Glucose is then fermented by microorganisms like Lactobacillus species, which convert the sugars into lactic acid. This acid is carefully purified and concentrated to ensure the quality required for polymer production. There are two main methods to turn lactic acid into PLA plastic: Ring-Opening Polymerization (ROP) and the widely used method of first converting lactic acid into lactide, a ring-shaped compound.
PLA is a carbon-neutral alternative to traditional plastics, offering the same level of sanitation and utility. It is biodegradable, does not emit toxic fumes when incinerated, and is FDA-approved for food contact. However, it has been criticised for its slow biodegradation rate, inability to mix with other plastics in recycling, and high use of genetically modified corn. PLA requires specialised facilities for chemical or enzymatic recycling and struggles to break down in regular recycling streams or home compost piles.
Despite these drawbacks, PLA is a viable, biodegradable replacement for plastic bags and has been adopted by companies like Wal-Mart for packaging and containers. It is also used in 3D printing, single-use packaging, and medical devices, offering a sustainable alternative to conventional plastics.
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PLA is a popular alternative to traditional petroleum-based plastics and is carbon neutral
Polylactic acid (PLA), a popular alternative to traditional petroleum-based plastics, is made from fermented plant starch, most commonly from corn. Other sources of starch include sugarcane, cassava, wheat, beets, and potatoes. The process of making PLA involves isolating starch from crops, which is then broken down into simple sugars such as glucose through hydrolysis. This glucose is then fermented by microorganisms, which convert it into lactic acid. The lactic acid is purified and concentrated, and then converted into polylactic acid through various methods.
PLA is a carbon-neutral alternative to traditional plastics as it is made from renewable, carbon-absorbing plants. This reduces our emissions of greenhouse gases. Additionally, PLA does not emit toxic fumes when incinerated, unlike conventional plastics. PLA is also biodegradable, breaking down into carbon dioxide and water within three months in a controlled composting environment. However, it should be noted that PLA breaks down very slowly in a home compost bin or landfill due to the lack of light and oxygen.
The use of PLA as an alternative to traditional plastics has gained traction, with companies such as Newman's Own Organics and Wild Oats adopting it for their packaging. Wal-Mart, the world's largest retailer, has also started using PLA containers in some stores. PLA is particularly popular for single-use packaging, such as bottles, straws, cups, and food containers. The medical field also utilizes PLA for medical devices and sutures.
However, there are some drawbacks to using PLA. It cannot be mixed with other plastics in recycling and requires specialized facilities for chemical or enzymatic recycling. Critics argue that PLA is not a panacea for the world's plastic waste problem due to its slow biodegradation rate. Additionally, there is concern over the high use of genetically modified corn in PLA production.
Despite these limitations, PLA is still a popular and viable alternative to traditional petroleum-based plastics. Its carbon-neutral status, biodegradability, and lack of toxic fumes make it an attractive option for many industries looking to reduce their carbon footprint and environmental impact.
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PLA is used in a variety of consumer products, from cutlery to surfboards
PLA, or polylactic acid, is a popular material used in a wide range of consumer products, from cutlery to surfboards. It is made from fermented plant starch, most commonly from corn, but can also be derived from sugarcane, tapioca root, cassava, and sugar beet pulp. PLA is a renewable and biodegradable alternative to traditional petroleum-based plastics, which has gained popularity due to its environmental benefits and functionality.
One of the main advantages of PLA is its ability to be used in various consumer products. In the food industry, PLA is used for disposable tableware, cutlery, cups, containers, lids, straws, and microwavable trays. It is also FDA-approved for food contact and is used for food packaging by major companies such as Walmart and Newman's Own Organics. Outside of the food industry, PLA is used for housings for kitchen appliances and electronics, compost bags, loose-fill packaging material, and surfboards.
In the medical field, PLA is favoured due to its biocompatibility and safe degradation into lactic acid, a compound naturally produced by the human body. It is used in drug delivery systems, medical implants, and tissue engineering. PLA is also used in the textile industry, where it is valued for its lightweight, breathable, and recyclable properties.
While PLA has gained popularity for its environmental benefits, there are some criticisms and limitations to its use. One issue is the slow rate of biodegradability, as PLA requires specific conditions, such as a controlled composting environment, to break down effectively. Additionally, PLA cannot be mixed with other plastics in recycling and has a high use of genetically modified corn, which may be a concern for some consumers.
Despite these limitations, PLA presents a viable alternative to traditional plastics, especially with the growing demand for eco-friendly and biodegradable products. Its widespread application continues to grow, and it is now the most commonly used plastic filament material in FDM 3D printing due to its low melting point, high strength, and good layer adhesion.
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PLA is certified industrially compostable and will break down within twelve weeks
Polylactic acid (PLA), a popular alternative to traditional petroleum-based plastics, is a plastic substitute made from fermented plant starch, usually corn. PLA is carbon neutral, does not emit toxic fumes when incinerated, and is biodegradable.
However, it is important to note that the biodegradability of PLA is slow and requires specific conditions. While PLA is certified industrially compostable, it will only break down within twelve weeks under commercial composting conditions. These conditions include elevated temperatures of 55-60°C, high water activity or water content of approximately 60%, and the presence of oxygen.
In a controlled composting environment, such as an industrial composting facility, PLA can break down into its constituent parts of carbon dioxide and water within three months. However, in a home compost bin or landfill, this process can take significantly longer.
The specific conditions required for the biodegradability of PLA highlight the importance of proper disposal methods. Without access to industrial composting facilities, PLA may still end up in landfills or the ocean, contributing to environmental waste.
To address this issue, some companies are working towards making PLA home compostable. NatureWorks, a leading PLA manufacturer, is incorporating polyhydroxyalkanoate (PHA) with PLA to create a fully home compostable bioplastic. Additionally, companies like BioPak are producing PLA that is certified industrially compostable to Australian and European Standards (AS4736 and EN13432), ensuring that their PLA products will break down within twelve weeks under the specified commercial composting conditions.
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Critics say PLA is not a panacea for the world's plastic waste problem due to its slow biodegradability
Polylactic Acid (PLA), a plastic substitute made from fermented plant starch (usually corn), is a popular alternative to traditional petroleum-based plastics. It is biodegradable, carbon-neutral, and does not emit toxic fumes when incinerated. However, critics argue that PLA is not a panacea for the world's plastic waste problem due to several factors related to its biodegradability.
Firstly, PLA has a slow rate of biodegradability. While it can break down into its constituent parts (carbon dioxide and water) within three months in a "controlled composting environment," this refers specifically to an industrial composting facility heated to 140 degrees Fahrenheit with digestive microbes. In a home compost bin or landfill, the process will take significantly longer due to the lack of light and oxygen. This slow biodegradability can lead to PLA fragmenting into chemical-laced microplastics, contributing to environmental contamination of food and water sources.
Secondly, PLA requires separate sorting and disposal systems from regular plastic materials. It needs to be sorted and brought to a "closed composting environment" to avoid contaminating the recycling stream. This places an additional burden on consumers to ensure their PLA waste is sent to the right facility, which can be challenging given the limited availability of industrial composting facilities.
Additionally, there are concerns about the environmental impact of using viable food crops, such as corn, to produce single-use plastics. The production of PLA can contribute to large-scale deforestation, reduced biodiversity, soil degradation, and other issues associated with monoculture crop farms. Furthermore, while PLA is derived from renewable resources, its production and end-of-life disposal pose environmental challenges. For example, the manufacture of PLA is fuelled almost entirely by non-recycled materials, and the single-use nature of PLA perpetuates wastefulness.
Overall, critics argue that the slow biodegradability of PLA, combined with the specific conditions required for proper composting and the environmental impacts of its production, means that it is not a comprehensive solution to the world's plastic waste problem. While PLA has its advantages, such as biodegradability and carbon neutrality, it also presents complexities that must be addressed through investment and policy changes to fully integrate it into a sustainable recycling system.
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Frequently asked questions
PLA, or polylactic acid, is a biodegradable plastic made from renewable sources like corn, sugarcane, or cassava, unlike traditional plastics derived from petroleum.
PLA is made from a renewable resource, which is better, both politically and environmentally, than conventional plastic packaging, which uses a large amount of oil. It is also compostable, meaning it will break down into harmless natural compounds under certain conditions.
Critics say that PLA is not a panacea for the world's plastic waste problem. It requires controlled conditions to biodegrade, such as in an industrial composting facility. It also cannot be mixed with other plastics in recycling.
The process of making PLA plastic begins by isolating starch from crops like corn or sugarcane using a method called wet milling. The starch then undergoes hydrolysis to break it down into simple sugars, which are fermented by microorganisms to produce lactic acid. This acid is then purified and concentrated before being turned into PLA plastic through a process called Ring-Opening Polymerization (ROP).
PLA is used in single-use packaging like bottles, straws, cups, and animal waste bags. It is also used in the medical field for devices and sutures.
