• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Plastics are often frowned upon. This is because people often think of them as cheap and not aesthetically pleasing.

Extracts from this document...


Plastics Plastics are often frowned upon. This is because people often think of them as cheap and not aesthetically pleasing. However they come in many different forms and often look very nice. Obviously there are types that do give the product a bad name. Mainly the cheap toys that are produced in the far east. This is not right and plastics should be seen as a real alternative and be able offer a huge amount of uses for this product. Polymers Polymers such as rubber, plastics and adhesives are organic structures. They can be natural, like amber and shellac, modified natural materials, like cellulose and casein, or synthetic, like nylon and polypropylene. ...read more.


When subjected to pressure, thermoplastics can deform in two ways. Elastic deformation occurs in which the initially curled long chains stretch out and this deformation is recovered when the pressure is removed. At higher temperatures or pressures, viscous or plastic deformation occurs in which the secondary bonds weaken and allow the molecular chains to slide over each other. This weakening of the bonds at higher temperatures means that thermoplastics are easy to cast or form. Thermosets Thermoset polymers are formed by a condensation reaction which forms strong, primary cross-linking bonds between adjacent polymer chains, giving them a rigid three-dimensional structure in which the atoms cannot move easily. Heating helps this cross-linking process and so the polymer hardens as it is heated. ...read more.


The tool costs are much lower than for presswork and it is possible to get high-quality finish, which is difficult when pressing SNICs, for example. One disadvantage is that the stress levels required to deform the material cannot be too high and this limits the materials which can be used and the shapes that can be generated. Bending Plastics can be bent in many ways. By using heat the bonds in the plastics become separated and malleable. This enables the plastic (usually in sheet form) to be bent. Both thermo and thermosetting plastics can be bent however thermosetting plastics can not then be reformed. If the plastic gets too hot however it will begin to deform. The structure and the appearance of the plastic will therefore change. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Resistant Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Resistant Materials essays

  1. People always use plastic things in their daily life but generally they do not ...

    In addition, a different kind of plastic is used by police. It is called "high-tech plastic" and it is used for bullet-resistant vests to keep them protected. These vests are about five times as strong as steel but they do not restrict the movability of the police.


    Nylon 6/12 is more expensive than Nylon 6/6. The property that gives Nylon 6/12 its utility is moisture absorption that is approximately half of that Nylon 6/6. This means the properties are much more consistent and experience less fluctuation due to ambient humidity levels in the end application.

  1. This case history documents events that occurred at the Markham coal colliery in Derbyshire, ...

    This may always have been the case, if the rod was assembled to one side of the hole in the trunnion or if the elastic deflection was enough to cause contact. Alternatively, the crack may have caused the rod to become so flexible as to bring one side or both

  2. Supply Chain Management

    Two methods were prevalent during this period; 3C and DFT. 3C was developed in the early 1990s as an alternative to MRP with significantly less maintenance requirements. The 3C approach was essentially the same as DFT, with less emphasis placed on the bill of materials.


    It is safe to assume that the same size timber would be satisfactory as the maximum load is no greater than the longitudinal wall. Design computations for the girts are found in Appendix 4. 6. Portal Frame A program called SPACEGASS was used to analyse the portal frame.

  2. Thermal Conductivity.

    I know that atoms in copper are in straight line and are neatly positioned into a regular order that of which makes it the best thermal conductor. So with that in mind I believe that copper will be the best thermal conductor out of the four choices I have.

  1. Sports Equipment -To carry out tests on different types of grip.

    accurate to prove that I did the test three times on each surface. These are the results of my NIKE trainer (shoe) My results are as followed: Wood = 4 Science floor = 0 Gym = 1.5 Concrete = 2 Grass = 2.5 Steel floor (lift)

  2. Chemistry polymers.

    Melamine - used in furniture. 2. Bakelite - used for saucepan handles and electric light fittings. 3. Epoxy resins - used in many glues. On the next page are some of the properties and uses of different polymers: Name Properties Uses Poly (ethene) Cheap, strong, waterproof, easily moulded.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work