polymers. polymer poly = many mer = units polymers are large molecules that has many units bonded...
TRANSCRIPT
POLYMERS
POLYMER
Poly = many
Mer = units
• Polymers are large molecules that has many units bonded together
• The individual units made up the polymer are called monomers
Natural Polymers
Amylose (in starch) DNA
Natural Polymers (Cont’d)
Protein
Types of Synthetic Polymers
• Addition polymer: monomers with double bonds are joined together through addition
• Examples:
• polyethene; plastic bags, plastic water bottles, tys
• polystyrene; styrene and Styrofoam cups, insulation, packaging
• polyvinylchloride (PVC, vinyl); building construction materials, sewage pipes, medical equipment
• Condensation polymer: monomers are joined by formation of esters or amide
• Need a carboxylic acid or a diamide
• Examples:
• Nylon – tires, synthetic fibres used to make rope and clothing
• Polyester (DacronTM) – fibres used to make fabric for clothing and surgery
Type 1: Addition polymers
• Made by addition reaction of monomers that have double bonds or triple bonds
Properties of Addition Polymers
• Stable as the double bond converted to single bond
• Flexible, stretchable and mouldable thanks to lots of weak, intermolecular forces that hold the long polymer chain together
Plastic bag- How it’s made???
• Made from a polymer
• Polyethylene
• Take 1 million years to break down/ degrade a plastic bag
Another Man-made Addition Polymer
• The super absorbent polymer is Polyacrylic acid
Super absorbent Polymer (Cont)
• Absorb up to 1,000 g of water per gram of polymer
Applications of Nylon• Invented by Dupont
• Nylon stands for New York
& London
• Tear resistant
• Water-proof
Used in making:
• parachutes
• stocking
• sleeping bags
• tent, sail
• cooking utensils
Silicone as polymer
Silicone based baking pan
Silicone breast implant
Traditional metal baking pan
Silicone structure
POLYMER TIME! Making slime• Pour Elmer Glue to the mark in a plastic
cup• Add equal volume of water to dissolve
the glue• Add desire food colorant• Stir • Add prepared Borax solution
DROPWISE until the slime is somewhat thicken
• Don’t add too much Borax