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Q
which biological molecules are not polymers
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Polypropylene (PP) plastic is known for its remarkable balance of toughness and flexibility, making it a widely popular material in various applications. Characterized by its resistance to fatigue, most chemicals, and impact, PP can withstand considerable wear and tear without significant degradation. Its strength is also reflected in its ability to resist deformation under stress, maintaining integrity under a wide range of temperatures (-20 to +120°C).
However, its tensile strength, typically ranging from 4,800 to 6,000 psi, is not as high as some engineering plastics but is sufficient for many consumer goods and packaging applications. Enhancements through copolymerization and the addition of reinforcing materials can further amplify its mechanical properties, making it adaptable to more demanding uses.
Yes, cellulose is extensively used as an insulating material, particularly in buildings. It is made from recycled paper products, mainly newspapers, which are treated with fire retardants. Cellulose insulation is favored for its eco-friendly nature, as it reuses waste paper and requires less energy to manufacture compared to other types of insulation. Additionally, it provides excellent thermal performance, effectively reducing heating and cooling costs in a home. Cellulose can be installed in various forms, such as loose-fill, dense pack, and wet spray, making it versatile for different insulation needs. Its ability to form a tight seal helps reduce air leaks, further enhancing energy efficiency. However, proper installation by professionals is crucial to avoid issues such as settling and moisture, which can affect its efficiency and durability.
Removing PVC glue from clothing requires careful handling to avoid damaging the fabric. Begin by allowing the glue to dry completely; this prevents spreading. Gently scrape off excess glue with a plastic knife or a similar tool. Avoid using sharp objects that could tear the fabric. For any residue, apply a commercial adhesive remover or acetone (found in nail polish remover) to a cotton ball and dab it on the stained area. Test in an inconspicuous area first to ensure it won’t damage the color or fabric. Rinse out the remover thoroughly with cold water. Wash the clothing item according to its care instructions, but air-dry instead of using a dryer in case the glue isn't fully removed. Heat can set the stain permanently.
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