Disadvantages -
- Use up a nonrenewable/finite resource
- take a long time to decompose
- take up space in landfill
- cause pollution in oceans
- produce poisonous gases on combustion
Advantages -
- can form any shape
- they don't corrode
- cheaper than alternative materials
- less dense so lighter
- good insulator of heat ( home insulation )
- good insulator of electricity ( wire covers )
- wind power is impossible without plastics ( Special plastics are used in the wind turbine covers and huge blades to tap into this environmentally friendly energy source! )
- The amount of fuel a delivery truck needs could be considerably reduced if the cargo uses plastic containers? Obvious: lightweight means less fuel consumption!
Hope this helps :-)
The question is without sense; depending of our scopes they have advantages or disadvantages.
Advantages of shape memory alloys include their ability to return to a predetermined shape when heated, high strength-to-weight ratio, and the ability to undergo a large amount of deformation. Disadvantages may include high cost, limited fatigue life, and sensitivity to temperature variation.
According to Sci-Tech Encyclopedia, as quoted on Answers.com, The linking of small molecules (monomers) to make larger molecules. There are two primary ways this linking occurs, condensation method, and the addition method. Both require a catalyst, such as an acid, or a heat source, depending on which method is used. For a more complete discussion of this subject, see the excellent article on Answers.com For a children's version of the explanation of polymerisation, see this excellent "Making Science Fun" article: http://www.stevespanglerscience.com/experiment/00000039
Advantages of detergents include their effective cleaning properties, ability to remove stubborn stains, and convenience in use. On the other hand, disadvantages may include potential harm to the environment due to chemical ingredients, skin irritation or allergies, and the buildup of residue on clothes or surfaces.
Advantages of ferrous metals include their high strength, durability, and magnetic properties. However, disadvantages may include susceptibility to corrosion, heavier weight compared to non-ferrous metals, and limited formability.
Addition polymerisation
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