Brown's Chemistry Revision Notes -
Smart Materials and Materials Science
SHAPE MEMORY POLYMERS, pH and
temperature sensitive-responsive polymers, Self-healing materials
ALPHABETICAL LIST of
materials, effects etc. mentioned on these pages: Smart
Materials Science INDEX * CARBON FIBRES * CHROMOGENIC
MATERIALS * ELECTROCHROMIC MATERIALS
* GORETEX * HALOCHROMIC
MATERIALS * HIGH PERFORMANCE
POLYMERS * KEVLAR * LYCRA *
MEMORY ALLOYS * MAGNETOSTRICTIVE
MATERIALS * NITINOL *
pH SENSITIVE POLYMERS *
PHOTOCHROMIC MATERIALS *
PHOTOMECHANICAL MATERIALS * PIEZO ELECTRIC EFFECT-MATERIALS *
MATERIALS * SHAPE MEMORY ALLOYS *
SHAPE MEMORY POLYMERS * SPANDEX
* TEMPERATURE-RESPONSIVE POLYMERS
* THERMOCHROMIC MATERIALS *
MEMORY POLYMERS (plastics), pH and temperature
These are organic (usually)
polymer materials in which deformation (change in shape) can be induced and
recovered through temperature changes or stress changes.
Shape memory polymers (SMPs) are
another example of scientists trying to design 'intelligent' and
'self-repairing' materials e.g. like the development of high performance
polymers and shape memory alloys.
Thermally induced shape
memory materials (like shape memory alloys, SMA) are easy to manufacture
but cheaper than SMAs.
They are used in minimal
invasive surgery procedures.
This can be achieved with
stimuli sensitive implant materials.
Degradable implants could be
inserted into the body in a compressed (temporary) shape, through a small
incision, where they obtain the desired final relevant shape for the
particular situation after warming up to body temperature i.e. the SMP
device has a transition temperature above room temperature (operating
theatre temperature) but below the body temperature of 37oC e.g.
SMPs have applications in high
components in technical devices.
pH-sensitive polymers are
materials which can swell (by absorbing water?) when the pH of the surrounding aqueous
(water based) media changes.
The effect is reversible with change in pH
in the opposite direction to contract or collapse the material
(i.e. loses water?).
INDEX of SMART MATERIALS PAGES
CHROMOGENIC MATERIALS - Thermochromic, Photochromic & Electrochromic Materials
SHAPE MEMORY ALLOYS e.g. Nitinol & Magnetic Shape Memory Alloys
SHAPE MEMORY POLYMERS, pH and temperature sensitive-responsive polymers,
PART 5 High
performance polymers like KEVLAR
GORETEX, THINSULATE and TEFLON-PTFE
PIEZOELECTRIC EFFECT (PIEZOELECTRIC MATERIALS) and PHOTOMECHANICAL MATERIALS
See also INDEX
Nanomaterials including carbon nanotubes, carbon fibres and silver nanoparticles
are on a separate page
More on chemistry applications:
Uses of 220+ chemical elements, compounds, mixtures &