Flashcards
C2 - Material Choices
Flashcards do conjunto (7)
- 1Name some natural polymers and synthetic polymers.Natural polymers are cotton, leather, wool etc...
Synthetic polymers are polyethene, nylon, neoprene etc... - 2Name and define technical wordsStrong - a larger force is required to break it
Flexible - it can bend
Stiff - difficult to stretch or bend
Hard - hard to scratch
Soft - easy to scratch
Tensile strength - strength when it is stretched - 3What are polymers?A long repetitive chain of small molecules called monomers.
- 4How does molecule size affect property?Smaller molecules have a lower boiling point and larger molecules have a higher boiling point.
- 5How do cross-links affect properties of material?If there are more cross-links, then the boiling point is higher and it becomes more stiff, stronger and harder.
- 6How is crude oil seperated?It is separated by a process of fractional distillation. Crude oil is heated and the molecules with the lower boiling point go upwards and the ones with the higher boiling point go downwards. They go into their different fractions.
- 7What is nanotechnology?Nanotechnology is the use of nanoparticles (particles with a size of 10nm to 100nm) to create materials with better properties.
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- FlashCards sobre C2 - Material Choices, criado por srikutty2312 em 16-06-2015.
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