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Questions and Answers
What are the characteristics of Polymer?
Some characteristics of polymers include flexibility, lightweight, resistance to chemicals, and electrical insulation.
What are the types of Polymer?
Polymers are classified into three main types: thermoplastics, elastomers, and thermosetting polymers.
What are the uses of Polymers?
Polymers are used in a wide range of applications, including packaging, textiles, automotive parts, and medical devices.
What is the difference between Thermoplastic and Thermosetting Plastic?
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What are some properties of Thermoplastics and Thermosetting plastics?
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Study Notes
Characteristics of Polymers
- High molecular weight, composed of many repeating units of small molecules
- Strong covalent bonds between atoms within the molecular backbone
- Properties can vary depending on the type of polymer and its molecular structure
Types of Polymers
- Natural polymers: occur naturally, e.g., cellulose, proteins, and starch
- Synthetic polymers: produced artificially, e.g., nylon, polyethylene, and polypropylene
- Semi-synthetic polymers: derived from natural polymers, e.g., cellulose acetate
Uses of Polymers
- Packaging materials, e.g., plastic bags, containers, and bottles
- Fibers, e.g., nylon, polyester, and acrylic
- Adhesives, e.g., glues, tapes, and epoxy resins
- Coatings, e.g., paint, varnish, and lacquer
- Medical applications, e.g., implants, sutures, and disposable gloves
Thermoplastic and Thermosetting Plastics
- Thermoplastic plastics: can be melted and reformed multiple times without undergoing any significant chemical change
- Thermosetting plastics: undergo a chemical reaction during the molding process, and cannot be remelted or reshaped
Properties of Thermoplastics and Thermosetting Plastics
Thermoplastics
- Can be melted and reformed repeatedly
- Can be recycled
- Examples: polyethylene, polypropylene, nylon, and polyvinyl chloride (PVC)
Thermosetting Plastics
- Cannot be melted or reshaped once molded
- Difficult to recycle
- Examples: epoxy resins, polyurethane, and silicone
- Often exhibit higher thermal and chemical resistance than thermoplastics
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