Category 1
________ are the most recent group of materials and have replaced ____ and _____ with advantages in many situations.
Plastics are the most recent group of materials and have replaced wood and metals with advantages in many situations.
NATURAL MATERIAL comes from ____ or _____.
NATURAL MATERIAL-They come from animals or plants .
True or False : Plastics are man - made materials
True
Poly is a Greek prefix that means _____
Poly is a Greek prefix that means many
A polymer has many _______.
A polymer has many monomers.
Plastics are non-corrosive and ____-______.
Plastics are non-corrosive and non-toxic.
__________ : They come from petroleum and natural gas. It needs a process called polymerization.
SYNTHETIC MATERIAL
A ______ is a small molecule which can be bonded to another monomer to form a long molecule also known as a ________.
A monomer is a small molecule which can be bonded to another monomer to form a long molecule also known as a polymer.
True or False : Polyester burns well. Polyester fibres are resilient and they absorb very little water. So polyester is commonly used in the textile industry to make fabrics,ropes,etc.
False : Polyester DOES NOT burn well because the fibres are resilient and they absorb very little water. So polyester is commonly used in the textile industry to make fabrics,ropes,etc.
A monomer is made of carbon in its backbones also known as ( _____ ______ )
A monomer is made of carbon in its backbones also known as (organic material)
Today more than _____ different classes exist.
Today more than 700 different classes exist.
What is : is relatively impact-resistant so it is widely used for furniture, television, phones etc.The expanded polystyrene is very light and an excellent thermal insulator.
POLYSTYRENE (PS)
True or False Thermostable plastic is recyclable.
False : Thermostable plastic is not recyclable.
PHENOLIC RESINS also known as :
PHENOLIC RESINS also known as (BACKELITE)
Define Teflon
Teflon is heat-resistant and has an almost frictionless surface.
Plastic began to be used in an important form in the year _______.
Plastic began to be used in an important form in the year 1950.
What is : used to make tires and adhesives. It's in general quite tough and durable. Blowing air into it while it's hot will make a foam. The solid foam is used for highly resilient flexible insulation panels.
POLYURETHANE
Polypropylene is natural ______. It’s very ________,so we only use it in high quality products such as latex gloves.
Polypropylene is natural rubber. It’s very expensive ,so we only use it in high quality products such as latex gloves.
What is this process called ? : Plastic grocery bags, bottles and similar items are made using this process. Plastic is introduced into the mold. After blowing into the plastic, the plastic will acquires its shape. After a few seconds, the mould is opened and the manufactured product is ready.
Blow Moulding : Plastic grocery bags, bottles and similar items are made using this process. Plastic is introduced into the mold. After blowing air into the plastic, the plastic will acquires its shape. After a few seconds, the mould is opened and the manufactured product is ready.
What is : SCRATCH resistant. Low Water absorption.Stain resistant. No odour. Available in a wide range of colours.
Melamine formaldehyde(MF)
Plastics are _______ and impermeable. Plastics are good insulators when you apply _____, sound or electricity. They are NOT biodegradable and cannot be easily ________.
Plastics are waterproof and impermeable. Plastics are good insulators when you apply heat, sound or electricity. They are NOT biodegradable and cannot be easily recycled.
NAME BOTH OF THESE TECHNIQUES :
_______: We use this technique to manufacture flat thing like plates.
_______ :Place the plastic into the mould. Then the other part of the cavity mould is closed to compress the material inside. Then heat the material and it adapts to the shape of the cavity. Finally we extract the object when the plastic is cooled and solidified.
Vacuum Forming and Compression
What is this process called? : As the plastic is extruded (pushed out of the tube through its mouth) the plastic acquires the shape of the mouth of the tube) We use this technique to produce ______ _______.
EXTRUSION : As the plastic is extruded (pushed out of the tube through its mouth) the plastic acquires the shape of the mouth of the tube) We use this technique to produce electrical wires
POLYETHYLENE(PE)
Polyethylene is soft and _____. It ́s monomer is a molecule called ________. It is used for making plastics bottles,bags,etc.
POLYETHYLENE(PE)
Polyethylene is soft and flexible. It ́s monomer is a molecule called ethylene. It is used for making plastics bottles,bags,etc.
What does PVC stand for and what is it used for?
PVC or POLYVINYL CHLORIDE is used for water pipes because it doesn ́t corrode and because it ́s cheaper than metal pipes. It's also used for packaging, window frames, rubber boots....