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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

129
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plasticity00:58

Plasticity

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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
196
Types of Toxins01:36

Types of Toxins

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Related Experiment Video

Updated: Jun 23, 2025

Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use
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Plastic Food Container Safety.

Joseph Pizzorno

    Integrative Medicine (Encinitas, Calif.)
    |June 24, 2024
    PubMed
    Summary

    Plastic food containers can leach chemicals into food, especially when heated. Resins with ID numbers 2, 4 (excluding wraps), and 5 are considered safest for food storage.

    Area of Science:

    • Food science
    • Materials science
    • Toxicology

    Background:

    • Plastic containers are widely used for food storage, leading to direct contact between food and plastic materials, including additives and contaminants.
    • While plastic food containers are generally considered safe, their inertness is not absolute, with potential for chemical migration into stored foods.

    Discussion:

    • Plastic food containers can leach metals and chemicals into food, particularly under elevated temperatures.
    • The migration levels vary depending on the plastic type, additives, and storage conditions.
    • Specific plastic resin identification codes (e.g., 2, 4, and 5) are associated with lower migration levels.

    Key Insights:

    • Resins with ID numbers 2, 4 (excluding food wraps), and 5 appear to be the safest options for plastic food containers.

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  • Understanding the types of plastics, their contaminants, and migration potential is crucial for food safety.
  • Elevated temperatures significantly increase the risk of chemical leaching from plastic food containers.

    • Outlook:

    • Further research into the long-term effects of chronic low-level exposure to leached chemicals is warranted.
    • Development of novel food packaging materials with enhanced inertness and safety profiles is an ongoing area of innovation.
    • Consumer education regarding the safe use of plastic food containers, including temperature considerations and resin identification, is essential.