WorksheetsGCSE_Unit 5D_Working with Polymers
Total questions: 25
Worksheet time: 13mins
What term correctly describes the separation of by-products from crude oil?
Polymerisation
Polymerisation
Refining
Fractional distillation
Which one of the following is a sustainable material?
Bioplastic
Gas
Coal
Oil
Which adhesive is best for glueing plastics together
Solvent cement
PVA
Contact adhesive
Epoxy resin
What two things are required to break down the large hydrocarbons to smaller, more useful molecules?
Heat
Gas
Pressure
Hydrogen
Select two distinctive features of thermoplastic molecules
Long chains tangles together
Lots of cross links
No fixed pattern
Long chains in straight lines
Thermoplastics have a degree of shape memory. State what is meant by ‘shape memory’ in this context?
When they are reheated they try to return to their original shape (unless overheated or overstretched)
When they are reheated they cannot return to their original shape (unless overheated or overstretched)
What distinctive features does a thermosetting molecular structure have?
Crossed Linked
More flexible structure
permanently stiff molecular structure once set
semi-permanent stiff molecular structure once set
Study the child carrier seat for bicycles shown below. Polypropylene has been used to make the product. Give 4 reasons for this choice.
Polypropylene is the material used to make the child carrier seat. Justify one additive that could be added to the polypropylene to enhance its properties
Molecules of ………………compounds known as monomers join together to form long chains of molecules called ……………….These atoms are joined end to end to form ………………
(a)
select the reason for using locking nuts over standard nuts
Become loose through vibration and work themselves loose
Resisting vibrations; avoid working themselves loose (because of the nylon insert)
They can be tightened easily
They require more force when applying them to the product.
What two methods of welding are available for plastic?
Chemical
Heat welding
Mig Welding
Tig welding
Polymer-based materials and components are available in standard stock forms, types and sizes. Select all the options that explain why materials are available in standard forms
Primary processing already completed; consistency and quality are improved
Recognised shapes, sizes and quantities can be used and accounted for in the design of complementary products.
Lower price and more readily available.
Easier to handle, transport and store as solutions will have been designed around standard sizes.
Select which is the last step in the vacuum forming process
The thermoplastic sheet is heated
The plastic sheet becomes flexible
The vacuum draws the excess air out, allowing the plastic to take on the shape of the mould
The vacuum pumps in air, allowing the plastic to take on the shape of the mould
What two advantages are there to adding a plastic laminate to a chipboard
kitchen worktop?
Gives the impression of a real wooden work surface – more desirable product
Comes in a variety of colours
Makes it more hard wearing and durable
Easy to manufacture in sheets
Drinking straws are made by the process of extrusion. Polypropylene has many properties which make it suitable for use in straw manufacturing. Select three relevant properties
It is safe for contact with food and drinks
It typically does not experience problems with stress cracking and it offers excellent chemical resistance at higher temperatures
Good dimensional stability
Comes in a variety of colours and lengths
Resin casting is used to create novelty items and small scale commercial products.
The process of casting resin is:
_______is mixed with a ________; poured into a mould; left to cure before removing from mould.
(a)
Why would a resin casting be suitable for customer made dental mouth guards?
Each item is unique, a mould is already created from the patient's teeth.
Easy to mass manufacture and quick to produce
Each item is a standard mould
Quick to produce as the product in a standard mould that is replicated.
(a) is good for creating hollow and thin walled bottle shapes.
____-___ is a good manufacturing process for complex shapes. Enables a one-piece moulding to be created. Can produce large volumes for relatively low cost. Waste materials can be melted and reused.
(a)
(a) is a good manufacturing process used for prototypes and testing mechanisms as a one-off product.
When laser cutting acrylic, you must remember to allow for the kerf that is removed by the laser cutter, to ensure your project fits together accurately.
If you needed to fit an acrylic base in a box that is 250mm x 250mm square, and the kerf on the laser cutter is 0.3mm, what size would you need to set the dimensions of the base to?
250.3 x 250.3mm
250 x 250 mm
250.6 x 250.6 mm
250 x 250.3mm
When laser cutting acrylic, you must remember to allow for the kerf that is removed by the laser cutter, to ensure your project fits together accurately.
Other than the kerf allowance, what other quality control methods are used?
Speed and power settings; to select the correct speed and power for the material thickness and the type of cut.
Focal length of the beam; will affect the size of the kerf
The type of material that is used on the laser cutting bed
The environment in which the laser cutter is placed and used in
What are the drawbacks of injection moulding objects with a small production run?
The initial cost of machinery is cheap and easily accessible.
High tooling costs.
Low tooling costs. and easy to do.
The initial cost of machinery is expensive.
What temperature is crude oil heated too?
350 degrees C
35 degrees C
350 degrees F
3500 degrees F
