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Polymer Laboratory

Polymer Laboratory

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Polymer Laboratory

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  1. Polymer Laboratory Mrs. Brostrom Integrated Science

  2. Plastics • Plastics are not created equal because they are meant for different purposes • Protecting clothing • Storing food • Carrying groceries

  3. Plastic bags are made from… • high-density polyethylene (HDPE) • grocery bags are HDPE • low-density polyethylene (LDPE) • garment bags from the dry cleaner are LDPE • linear low-density polyethylene (LLDPE) • thick, glossy shopping bags from the mall are LLDPE •The major difference between these three materials is the degree of branching of the polymer chain.

  4. Shopping bags • Plastic wrap • Dry cleaning bag • Sandwich bag

  5. Your Task • Design and conduct an experiment testing the physical properties of different types of plastic • You may choose between • Puncture resistance • Tensile strength • Abrasion reistance

  6. Physical Properties of Plastics • HDPE and LLDPE are composed of linear chains • LDPE chains are branched • Branching can influence a number of physical properties including tensile strength • The more branched a molecule is, the lower is its tensile strength (dry cleaning bag)