Dt Gcse Revision: Smart Materials

SMART Materials A SMART material is a material that is affected by outback(a) influence. Polymorph * Type of thermoplastic ( raft be reshaped many times). * Normally supplied in form of granules or small plastic beads. * Low fusing temperature of around 60C. This means it can be reduced to a mouldable condition by immersion in hot water. * Once fused turns from opaque to clear. * Heating above 65C is dangerous as it will become a sticky-adherent mass, similar to hot-melt glue. Polymorph has high molecular weight and great tensile energy, and therefore suited for applications where mechanical strength is important. * Some uses are Mould-making (i. e Gum-shields), general DIY materials, making a polymorph skeleton to support other materials, trainer/shoe components. QTC (Quantum Tunnelling Composite)* QTC is a composite material do from conductive filler particles combined with an elastomeric binder, typically silicone rubber. QTC Material has the unique ability to smoothly change f rom an electrical insulator to a metal-like conductor when lay under insisting. * While in an unstressed state the QTC Material is a near-perfect insulator with any form of deformation the material starts to conduct and with sufficient pressure metallic conductivity levels can be achieved. * QTC Material can be formed or moulded into virtually any size, thickness or shape. * QTC Material is automatically strong. QTC Material can be made to withstand extreme temperatures limits. * Used for switches and keyboards. Thermochromic Ink * These materials change colour when there is a change in temperature. * Thermochromic sign comes in two forms Liquid crystals and Leuco dyes. * Leuco dyes are easier to work with and allow for a greater range of applications. * Applications of thermochromic ink include flat thermometers, battery testers, clothing. Mr Tsiang