Chloe Zhang
Plastic is a synthetic material that has become integral to modern life, with applications in packaging, construction, automobiles, and medicine. However, its slow decomposition rate and persistence in the environment have raised concerns about its impact on ecosystems. To address these issues, it is crucial to understand the fate of plastics and develop methods to predict their behaviour and impact. This includes predicting plastic prices, the behaviour of microplastics in river networks, and the performance of plastics in specific applications, such as predicting plastic hinge length in a shear wall using programs like SAP 2000 or ETABS.
| Characteristics | Values |
|---|---|
| Decomposition rate | Foam plastic cup: 50 years, Plastic beverage holder: 400 years, Disposable diaper: 450 years, Fishing line: 600 years |
| Global production | 8300 million metric tons |
| Global waste | 6300 million metric tons |
| Percentage of recycled waste | 9% |
| Percentage of waste incinerated | 12% |
| Percentage of waste accumulated in landfills or the natural environment | 79% |
| Uses | Packaging (40%), Building and construction (20%), Automobiles (up to 20%), Furniture, Toys |
| Types | Thermoplastics (e.g. polyethylene, polypropylene), Thermosets (e.g. epoxy resin, polyimide), High-performance plastics (e.g. aramids, ultra-high-molecular-weight polyethylenes) |
| Price predictors | Crude oil derivative prices, Business indicators, Political indicators, Economic indicators |
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What You'll Learn
Prices of raw plastic materials
The price of raw plastic materials is influenced by several factors, and predicting these prices can be challenging due to the dynamic nature of the market. Here are some key considerations and strategies for understanding and managing the pricing of raw plastic materials:
Factors Influencing Raw Plastic Material Prices:
- Crude Oil and Natural Gas Prices: One of the most significant factors affecting plastic prices is the cost of crude oil and natural gas, which are essential feedstocks for the plastic production process. Changes in the prices of these commodities can have a ripple effect on the plastic market.
- Market Demand and Supply: The balance between demand and supply significantly impacts raw plastic prices. For instance, the growing demand for plastic packaging in the food and beverage industry, as well as the increasing use of plastics in healthcare, automotive, and consumer goods sectors, drives up prices. Conversely, a decrease in demand or an increase in supply can lead to lower prices.
- Economic Indicators: The health of the global economy influences the price of raw materials, including plastics. Economic fluctuations, such as recessions or booms, can affect the purchasing power of businesses and consumers, which, in turn, impacts the demand for plastics and their pricing.
- Inventory and Capacity Adjustments: Producers' inventory levels and capacity adjustments can also influence prices. For example, if producers have high inventory levels, they may lower prices to reduce stock, as seen in the poly inventory drop in late 2016. On the other hand, unexpected production disruptions, like scheduled maintenance or unexpected downtime, can reduce supply and potentially increase prices.
- Operating Rates: The operating rates of plastic manufacturers can impact prices. For instance, if operating rates are high, it could indicate increased production and potentially lower prices, and vice versa.
- Government Policies and Tariffs: Government interventions, such as tariffs on imported plastic resins and feedstocks, can significantly impact raw material costs. The 2025 tariffs in the US are expected to increase costs for manufacturers, disrupting supply chains and forcing strategic shifts.
- Environmental Concerns and Regulations: Growing environmental concerns over plastic waste and government regulations on plastic usage, particularly in packaging, may hamper the growth of the plastic market. This could lead to increased costs for manufacturers to comply with sustainability standards.
- End-Use Industries: The specific end-use industries for plastics can influence prices. For example, the packaging industry's demand for lightweight and convenient plastic solutions may command specific price considerations.
Strategies for Managing Raw Plastic Material Prices:
- AI-based Prediction Models: Developing AI solutions, such as the one mentioned in the article, can help businesses predict raw plastic prices with high accuracy. These models consider various data points and indicators to forecast prices, enabling better decision-making and contract negotiations.
- Diversify Supplier Base: To mitigate the impact of price fluctuations, businesses can build relationships with multiple suppliers from different regions, including tariff-free areas. This strategy helps prevent disruptions and provides leverage in price negotiations.
- Recycled Plastics and Commercial Recycling Programs: Investing in recycled plastics and implementing commercial recycling programs can offset rising raw material costs. Eco-conscious consumers and regulatory incentives may also contribute to cost savings and attract a new customer base.
- Cost-saving Measures and Reshoring: In response to tariffs and increased costs, manufacturers may need to adopt cost-saving measures, such as reducing operational costs or exploring alternative sourcing options. Reshoring production, or bringing it back to the domestic market, could provide long-term cost stability and benefit from government incentives.
- Tiered Pricing Strategies: Implementing tiered pricing strategies can help manufacturers navigate cost fluctuations. By offering different price points, they can maintain competitiveness without sacrificing margins.
- Increase Buffer Stock: Building up buffer stock can reduce the immediate dependency on imports and help manage supply chain disruptions more efficiently.
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Plastic hinge length in a shear wall
The plastic hinge length of a shear wall is an important index in the framework of performance-based seismic design. The accumulation of plastic strain in the plastic hinge region of walls weakens their ability to resist lateral actions. Thus, the length of this region is studied as a representative indicator of the energy consumption capacity and ductility of walls.
The plastic hinge length calculation formulae for SRCXSWs (superimposed RC shear walls with embedded bracings) have been proposed and verified by numerical and experimental results. The research results show a functional relation between the ultimate deformation and the equivalent plastic hinge length. It is found that decreasing the ratio of deformation caused by the shear effect to top deformation or increasing the compressive strain properties of concrete by parameter assignment will be more conducive to the formation and development of the plastic hinge zone of SRCXSWs.
The existing formulae for calculating the equivalent plastic hinge length of SRCXSWs are not effective for all cases, and new formulae have been proposed to address this issue. The study of the equivalent plastic hinge length of SRCXSWs began after the nonlinear finite element results were widely accepted.
The plastic hinge length of coupled and hybrid-coupled shear walls has also been studied. A coupled wall consists of two or more reinforced concrete (RC) shear walls connected by RC coupling beams or steel CBs (hybrid-coupled walls). A parametric study was conducted to fill the gap in the literature on the plastic hinge length of these walls, considering the axial stress ratio (ASR) and coupling ratio (CR) as variables. It was found that increasing the ASR decreases the plastic hinge length, while increasing the CR of coupled walls has a similar effect but also decreases the walls' ductility.
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Plastic in the environment
Plastic pollution has become one of the most pressing environmental issues, with the rapidly increasing production of disposable plastic products overwhelming the world's ability to deal with them. Plastic pollution is most visible in developing Asian and African nations, where garbage collection systems are often inefficient or non-existent. However, the developed world, especially countries with low recycling rates, also struggles to properly collect discarded plastics. Plastic trash has become so ubiquitous that it has prompted efforts to write a global treaty negotiated by the United Nations.
Plastics are derived from fossil fuels, including natural gas and crude oil, and are designed to defeat natural decay processes. Since synthetic plastics are largely non-biodegradable, they persist in natural environments for hundreds of years. Single-use plastics, designed for one-time use, are a prime culprit behind our throw-away society, accounting for about 50% of all plastics produced annually. These lightweight products are often not deposited in containers for subsequent removal to landfills, recycling centres, or incinerators, but are instead improperly disposed of, immediately polluting the environment.
Once plastics enter rivers and seas, they are virtually impossible to recover. They can be transported by ocean currents around the world, with plastic items from Russia, the United States, Europe, South America, Japan, and China found on Henderson Island, an uninhabited atoll in the South Pacific. Plastic pollution can alter habitats and natural processes, reducing ecosystems' ability to adapt to climate change and directly affecting millions of people's livelihoods, food production capabilities, and social well-being.
To reduce the impact of plastic pollution, individuals can limit their single-use plastic waste, reuse and repurpose old items, and support legislation and organizations addressing plastic reduction. However, systemic transformation is needed to transition to a circular economy and address the plastic pollution crisis effectively.
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Decomposition rates of plastic products
Plastic is one of the most widely used man-made materials, with applications in packaging, construction, automobiles, furniture, and toys. Its versatility, durability, and low cost have made it a dominant product since the early 20th century. However, its slow decomposition rate has raised significant environmental concerns.
Plastics degrade through various processes, primarily photo-oxidation, and their chemical structure determines the rate and pathway of decomposition. The specific surface degradation rate (SSDR) is a metric used to harmonize disparate types of measurements and estimate half-lives. For example, high-density polyethylene (HDPE) in the marine environment has an SSDR range from 0 to approximately 11 μm year–1, resulting in estimated half-lives from 58 years (for bottles) to 1200 years (for pipes).
The Marine Conservancy has provided estimates for the decomposition rates of specific plastic products. They predict that a foam plastic cup will take 50 years to degrade, while a plastic beverage holder will take 400 years, a disposable diaper 450 years, and fishing line an astonishing 600 years. These prolonged decomposition rates contribute to the persistence of plastic debris in the environment.
The environmental degradation mechanisms of plastics can be classified as physical or chemical changes. Physical changes refer to alterations in the bulk structure, such as cracking, embrittlement, and flaking, while chemical changes occur at the molecular level, including bond cleavage and oxidation of long polymer chains, resulting in the creation of new, shorter-chain molecules. These chemical changes can release toxic substances such as bisphenol A.
Furthermore, the decomposition rate of plastics in marine environments, such as oceans and seas, is influenced by factors like exposure to sunlight, rain, and other environmental conditions. Recent studies suggest that plastics in these environments may decompose faster than previously believed due to these factors. However, the increased volume of plastics in the ocean has also slowed down the overall decomposition process.
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Plastic production
Plastic is derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used. The production of plastics can be broadly categorized into two types: thermoplastics and thermosetting plastics. The type of plastic chosen for a particular application depends on its properties, which are determined by its chemical composition and structure.
The first step in plastic production is the extraction of raw materials, which are then refined to obtain specific chemicals needed to make plastic—hydrocarbons. Large hydrocarbon molecules are then broken down into smaller molecules in a process called "cracking." This process involves high temperatures and pressure to break down the molecular bonds, resulting in smaller molecules like ethylene and propylene.
The next step is polymerization, where these smaller molecules are reassembled into long chains, forming polymers. Polymerization can be achieved through various methods, including addition polymerization, condensation polymerization, and copolymerization. During this process, additives may be incorporated into the plastic to enhance its properties. These additives can improve the plastic's color, strength, resistance to heat or UV radiation, flexibility, and more.
After polymerization, the plastic undergoes the molding process, where it takes its final shape. There are several molding techniques, including injection molding, blow molding, rotational molding, and extrusion. The choice of molding technique depends on the type of plastic, the complexity of the part, and the production volume.
The final stage in plastic production is finishing, which involves any post-processing steps needed to achieve the desired appearance and performance of the part. Finishing processes can include cutting, drilling, painting, printing, and coating.
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Frequently asked questions
The price of raw plastic materials depends on crude oil derivatives prices and various business, political and economic indicators. An AI model can be used to predict these prices with an accuracy of over 90%.
A model that predicts the masses of microplastics in river networks is a step forward in tackling global plastic pollution.
You should use Abaqus or other finite element programs.
