What is the most common shape-memory polymer?
What is the most common shape-memory polymer?
What is the most common shape-memory polymer?
thermo responsive shape memory polymers
The shape memory polymers which change in shape with the change of temperature are called thermo responsive shape memory polymers. By far these are the most common shape memory polymers. The shape memory polymers are generally non conductive. So they are made conductive by blending with carbon nano powders.
What are shape memory polymers examples?
These polymers have been used to produce, among other things, medical devices such as stents and catheters. Typical examples of polymers which can exhibit this shape memory effect include (meth)acrylates, polyurethanes, and blends of polyurethane and polyvinylchloride.
How strong is shape-memory polymer?
3 to 5 MPa
PEO based crosslinked SMPs The addition of 1.5 wt% maleic anhydride increased in shape recovery from 35% to 65% and tensile strength from 3 to 5 MPa.
What is a polymer that has memory?
There are many different types of shape memory polymer and more are being developed all the time. Three commonly used engineering polymers that can demonstrate the shape memory effect (SME) include polytetrafluoroethylene (PFTE), polylactide (PLA), and ethylene-vinyl acetate (EVA).
Is rubber a shape-memory polymer?
An ideal shape memory polymer (SMP) has a large entropic component that drives shape recovery with a distinct transition mechanism to control the recovery conditions. Polyisoprene rubber is highly elastic and shows shape memory behavior through strain induced crystallization above its glass transition temperature.
How is Nitinol used?
Nitinol is used to manufacture catheter tubes, guidewires, stone retrieval baskets, filters, needles, dental files and archwires and other surgical instruments (6). A particularly important use of Nitinol is in stents.
What are shape memory polymers made of?
The shape-memory polymer network consists of covalent netpoints and switching segments based on a physical interaction. To display shape-memory functionality, the polymer network has to be temporarily fixed in a deformed state under environmental conditions relevant to the particular application.