Polymers - Thermosetting Plastics Flashcards by Mr Cooper

What are the two groups?

Ivan K

Thermoplastics and Thermosetting plastics

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Examples of Thermoplastics

Ivan K

Acrylic
Polythene
Polypropylene
PET
ABS
PVC

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Properties of ThermoPlastics

Ivan K

Will soften when heated
Tend to be flexible
Impact resistant
can be coloured

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Examples of Thermosetting plastics

-Ivan k

GRP- Glass Reinforced polyester
Bakelite
Phenol
Epoxy Resin(e.g Araldite)

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What is an efficient way of producing large quantities of identical plastic items?

Ivan K

Injection Moulding

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Where are thermoplastics used?

Mechanical parts or even plastic bags

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Are thermoplastics expensive to process?

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Are thermoplastics recyclable?

Yes

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Is Teflon a thermoplastic?

Yes

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Is PVC a thermoplastic?

Yes

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What is needed to start Injection Moulding?

-Oscar Lawson

Thermoplastics in granulated or powdered for which are fed into the hopper.

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What is the rotating screw in the steel barrel of an injection moulder called?

-Oscar Lawson

Archimedes screw. It carries plastic from barrel to mould whilst the material is heated.

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What happens once the thermoplastics have heated up (in injection moulding)

-Oscar Lawson

The hot material builds up at the ends before being injected into the mould.

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What is the entrance into the cavity of the mould called?

-Oscar Lawson

A spruce

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What steps are taken to ensure successful injection moulding?

-Oscar Lawson

The mould is heated beforehand to avoid setting the plastic too rapidly
Pressure is kept to prevent shrinkage. This returns a better product quality.

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What are the properties of thermoplastics?

- Krystian Shanahan

Will soften when heated
Flexible
Impact resistant
Can be coloured

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What is a CIM?

-Krystian Shanahan

Computer integrated manufacture

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How is plastic fed into the injection moulding machine ?

-Krystian Shanahan

Through a hopper

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Through what device is plastic injected into the mould?

-Krystian Shanahan

A sprue

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Why is pressure maintained during dwell time?

-Krystian Shanahan

To prevent the material creeping back during setting

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What is another name for Plastics?

Humphrey Marsh

Polymers

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A plastic is made up of what?

Humphrey Marsh

A long chain of molecules

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What defines the properties of a material?

Humphrey Marsh

How long chained molecules are linked together

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The long chain molecules in thermosetting plastics are chemically tied by what and what links them?

Humphrey Marsh

Covalent bonds and they are cross-linked

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Thermosets have little plasticity and are what? - Humphrey Marsh

Rigid

What is a downside of thermosetting plastics? Yan K

They can only be formed once

What do thermoplastics have? Yan K

Good heat resistance

What is UF used for? Yan K

Electrical fittings, domestic appliance part, adhesives, coating paper, textile

What is MF used for? Yan K

Tableware, decorative laminates for work surfaces, electrical insulation, buttons

What is PR used for? Yan K

Casting, encapsulation, embedding, panels, boats, car bodies, chair shells, containers

In thermoplastics, what force holds the long chain molecules together? -Oscar Mabon

Van der waals forces of attraction.

Is Acrylic a thermoplastic? -Oscar Mabon

Yes

Is PVC a thermoplastic? -Oscar Mabon

Yes

Is Polythene a thermoplastic? -Oscar Mabon

Yes

Is Polypropylene a thermoplastic? -Oscar Mabon

Yes

Can Melamine Formaldehyde sheets be printed and laminated onto Particle Boards? Caspar Tyser

Yes

Compression Moulding requires.........? Caspar Tyser

Heat and Pressure

Can Thermosetting Plastics be re-heated and moulded after they have already been heated and moulded? Caspar Tyser

Can Thermoplastics be re- heated and moulded once this cycle has already occurred? Caspar Tyser

Yes

Thermosetting plastics are tied by covalent bonds and are...? Caspar Tyser

Cross-linked

What is GRP short for? -Oscar Lawson

Glass reinforced paper

What does a hardener do to epoxy resin? -Oscar Lawson

Causes a reaction forming crosslinking between the long chain molecules

What is urea formaldehyde used for? -Oscar Lawson

Electrical fittings like plug sockets, wood adhesives and laminating particle boards such as MDF

What would you use melamine for? -Oscar Lawson

Plastic plates and cups as it is very heat resistant and can be printed and coloured

How does compression moulding work? -Oscar Lawson

Powder is measured out and placed into a mould. The mould is closed under pressure and heat, curing the plastic.

What are long chain molecules held together by? Nathan P

Forces of attraction called van der waals

What allows thermoplastics to be reformed and moulded? Nathan P

The fact that they soften when heated

Properties of thermoplastics: Nathan P

Soften when heated Tend to be flexible Impact resistant Can be coloured

How many times can thermosetting plastics be moulded? Nathan P

Only once, then they are permanently rigid.

Injection moulding uses what kind of plastics? Nathan P

Thermoplastics

What are the two groups of plastics? Torsai K

Thermoplastic and Thermosetting plastics

What is injection moulding? Torsai K

The process is used to produce large quantities of identical plastic items

What are examples of thermoplastics? Torsai K

Acrylic, Polythene, Polypropelene, PET, ABS, PVC

What are the characteristics of thermoplastics? Torsai K

Thermoplastics soften when heated, tend to be flexible, are impact resistant, and can be coloured.

Why is injection moulding only reserved for volume production? Torsai K

Moulds can be quite expensive. Due to the high cost, moulding should be reserved for volume production

What is epoxy resin used for? -Ssnehnil G

It acts like a glue

Use of Urea Formaldehyde? -Ssnehnil G

Electrical fittings, plugs and sockets

What does GRP stand for? -Ssnehnil G

Glass Reinforced Polyester

What is Phenol Formaldehyde also known as? - Ssnehnil G

Bakelite

Are thermosetting plastics rigid? -Ssnehnil G

Yes

What is plastic? Torsai K

Plastics are a group of materials which are 'plastic' at some point in the manufacturing process

What are examples of thermosetting plastics? Torsai K

GRP, Melamine, Bakelite, Urea Formaldehyde, and Epoxy resin (Araldite).

How are thermoplastics different from thermosetting plastics? Torsai K

A thermoplastic will soften when heated; a thermosetting plastic will not.

Characteristics of thermosetting plastics. Torsai K

Thermosetting plastics withstand higher temperatures without losing rigidity and are good insulators.

How do thermosetting plastics form? Torsai K

Thermosetting plastics begin as long-chain molecules but become chemically tied and are cross-linked when polymer cures.

What is compression moulding? Torsai K

A precise amount of powder is placed in a mould, closed under pressure with heat applied, and plastic cures.

Are thermosetting plastics recyclable?

What type of molecular structure do thermosetting plastics have?

Rigid

How are the What type in thermosetting plastics linked?

Cross-linked

What process are thermoplastics made through?

Cross-linked

Do thermosetting plastics soften under heating?

What is a plastic? -Lucas M

A material that is 'plastic' at some point in the manufacturing process.

What force of attraction holds thermoplastics together? -Lucas M

Van Der Waals forces of attraction.

Why can thermoplastics be reformed multiple times? -Lucas M

It softens when heated.

Which thermosetting plastic resists heat to 250 degrees Celsius? -Lucas M

Epoxy resin

Which thermosetting plastic is scratch resistant and comes in a wide range of colours? -Lucas M

Melamine-formaldehyde

What are plastics also known as? Nathan P

Polymers

Melamine can be... Nathan P

Printed, coloured and is resistant to heat

Laminating can make a particle board... Nathan P

Hard, coloured and heat resistant

GRP stands for... Nathan P

Glass reinforced polyester

What is required for epoxy resin to set? Nathan P

Resin and hardener

How many times can thermosetting plastics be formed? | -Alfie Turner

once

Do thermosetting plastics have good resistance to heat? | -Alfie Turner

YES

Thermoplastics have little plasticity and are ...? | -Alfie Turner

rigid

What does epoxy resin require to set? | -Alfie Turner

A hardener

How can melanin be used? | -Alfie Turner

Printing, colouring and its resistant to heat

Polymers - Thermosetting Plastics Flashcards

(86 cards)