What property does a shape memory polymer have GCSE? Shape memory polymer is a polymer that can be bent out of its original shape and then returned to its original shape when heated. Potential applications
What property does a shape memory polymer have GCSE?
Shape memory polymer is a polymer that can be bent out of its original shape and then returned to its original shape when heated. Potential applications for this include sporting equipment, such as helmets and gum-shields or car bumpers, which can be heated to return to their original shape after a minor collision.
What are two uses of Polyethene?
Uses of poly(ethene) (polyethylene)
|Making film||Food packaging Shopping bags||Cling film Milk carton lining|
|Injection moulding||Dustbins Crates||Buckets Bowls|
|Blow moulding||Detergent bottles Drums||Squeezable bottles|
|Extrusion||Water pipes||Flexible water pipes Cable jacketing|
What is a shape memory alloy BBC Bitesize?
Shape-memory alloys (SMA) are metal alloys that can remember their shape when heated. These alloys have been utilised on spectacle frames that spring back to shape if they are squashed. Nickel titanium (nitinol ) is a type of SMA, and it contracts when heated, whereas most metals expand.
What are 3 uses of polymers?
Uses of polymers
- new packaging materials.
- waterproof coatings for fabrics (eg for outdoor clothing)
- fillings for teeth.
- dressings for cuts.
- hydrogels (eg for soft contact lenses and disposable nappy liners)
- smart materials (eg shape memory polymers for shrink-wrap packaging)
What property does a shape memory polymer have?
Shape-memory polymers (SMPs) are polymeric smart materials that have the ability to return from a deformed state (temporary shape) to their original (permanent) shape when induced by an external stimulus (trigger), such as temperature change.
What are shape memory alloys used for?
Shape-memory alloys are metals that, even if they become deformed at below a given temperature, they will return to their original shape before deformation simply by being heated. Alloys with this unusual characteristic are used as functional materials in temperature sensors, actuators, and clamping fixtures.
What are the two types of Polyethene?
The most common types of polyethylene are:
- Branched Versions. Low-density polyethylene (LDPE) Linear low-density polyethylene (LLDPE)
- Linear Versions. High-density polyethylene (HDPE) Ultra-high-molecular-weight polyethylene (UHMWPE)
- Cross-linked polyethylene (PEX or XLPE)
What are the real life applications of polymers?
Product made from polymers are all around us: clothing made from synthetic fibers, polyethylene cups, fiberglass, nylon bearings, plastic bags, polymer-based paints, epoxy glue, polyurethane foam cushion, silicone heart valves, and Teflon-coated cookware.
What kinds of polymers do you use daily?
Polymers become the raw materials for products we now use every day, including: synthetic clothing, fiberglass, plastic bags, nylon bearing, polyethylene cups, epoxy glue, silicone heart valves, Teflon-coated cookware and our personal favorite, polymer based paints.
How does a shape memory polymer change shape?
A shape memory polymer can change from a temporary shape that is achieved by deforming it, to a previous shape which is its permanent shape when it is not being deformed. There are different stimuli that can be used to achieve this.
When do polymers return to their original shape?
As implied in the name, these are materials who have a “memory” of their shape. Specifically, they are able to return to their original shape after they have been deformed in some way. They can return to their original shape when a particular stimulus is applied. This stimulus may be heat or light, for example.
How are nano-scale particles used in smart materials?
Nanoscience and smart materials The use of nano-scale particles is relatively new, and it is still unclear what their long term effect might be on health and the environment. Smart materials include thermochromic pigments, shape memory polymer, shape memory alloy and hydrogels.
How are medical stitches similar to shape memory alloys?
In addition, medical stitches can self-tighten as a wound heals. Shape memory alloys are mixtures of metals that return to their original shape when heated, similar to shape memory polymers.