The new materials JJ Shepstone
L.O.’s • ALL • To be able to describe the simple properties of at least two new materials • MOST • To describe in detail how ‘velcro’ is made and works • SOME • To describe how ‘velcro’, ‘kevlar’ and ‘gore-tex’ are made and used
Gore-Tex • Gore-Tex is a remarkable multi-layered material in vented by Bob Gore • He developed an idea from ‘Teflon’ (PTFE) use on non stick cooking pans. • It was ‘breathable’ in other words gas can permeate through the material but water (liquid i.e. Rain) can not. • Rain just rolls off! Can you explain why?
Kevlar • This remarkable material was the result of an ‘accidental’ discovery at Du Pont. • It is a light weight fibre with a high melting point. • By making sheets of the polymer and then layer many layers of the sheets they made a flexible material, 5 x stronger than steel! • How could it make a bullet proof jacket? • How could you use it to make a pair of furnace handling gloves?
Velcro • George de Mestral invented this material from Nylon. • He copied the way natural burrs (seed cases) stuck to hikers’ socks • Try playing with a piece and see if you can write about how it works.
Velcro on You Tube • http://www.youtube.com/watch?v=62jhQNyPm3s • http://www.youtube.com/watch?v=bAQqRMDg9jk • http://www.youtube.com/watch?v=vTSDPKktbUk