Biomedical Engineering Reference
In-Depth Information
Figure 8.6 Two situations exhibit possible polarization of a single
martensite variant, along easy and hard magnetization axis
[16].
The brief discussion of mechanisms should give the basic
outlook for knowledge in this area and may also be the next step
for further consideration on properties, problems, receiving
techniques, and applications of MSMAs.
8.2.2
SMPs — Shape Memory Polymers
For SMP, the shape memory effect cannot be considered as intrinsic
property like in MSMAs or SMAs. It results from a speciic polymer
architecture and processing conditions. Speciic architecture of
polymer is seen as a network consisting of molecular switches
that are sensitive to speciic external stimuli and net points that
can be realized chemically (by covalent bonds) or physically (by
intermolecular interactions). Memorizing the shape involves
processes such as cross-linking, crystallization, entanglement of the
polymer chains, and formation of the domain structure.
Most SMPs demonstrate morphology that consist of at least
two segregated domains as for blocky copolymers, where we can
 
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