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A kernel call a polymer usually used to make fuel cells can " remember " up to four different shapes , and revert to each one at different temperatures , allot to new inquiry .
The polymer , or others like it , could be used in fields lay out from biomedical applied science to space exploration .
Perfluorosulphonic acid ionomer ( PFSA ) is what ’s known as a bod memory board polymer . A polymer is a substance made mostly of repeating indistinguishable or standardized molecules .
The chemical substance structure of shape memory polymers allows them to " memorise " shapes under sure stipulation of passion , magnetism or wet . The next clock time they ’re exposed to those stipulation , the polymers revert back to the memorizedshapes .
cast - memory polymer have been commercially available for decades in the form of insulation for wiring and other industrial uses . Some have been tested for use in medical twist , such as stents that can shape - shift inner blood line vessel to well-defined coagulum . NASAhas considered shape - retentivity polymers as a way to shut down up antennas for launch and then stretch them in space .
But until now , shape - retentiveness polymers have only been able to contain two or three SHAPE full , and those shapes must be manipulated at certain temperature .
A retention for frame
But PFSA is different , said Tao Xie , a research scientist at General Motors and lead author of the new study .
It can arrest up to four different human body , include its original strain . And as long as the opening between each temperature is large enough , each shape can be assigned to a temperature of the manufacturing business ’s choice .
Xie coaxed the Supreme Headquarters Allied Powers Europe - memory effect out of PFSA by heat up lean films of the material , reshaping it to " fix " a shape , then cool and reshaping again . When heated back up , the cloth retrovert to each situate form , recall up to four shapes entire . So far , Xie has been able to twirl , elongate , and shorten flight strip of PFSA simply by commute the temperature .
PFSA has properties similar to other known shape - memory polymers , Patrick Mather , a prof ofbiomedicaland chemical engineering at Syracuse University who was not involved in the inquiry .
However , PFSA might not qualify under a strict definition of soma - memory polymers because the upshot count heavily on cycles of periodical , rather than continuous , heating , say Mather .
No special chemistry ask
From a scientific standpoint , PFSA is " not a unequaled chemistry at all , " sound out Ken Gall , a textile scientist from Georgia Tech who was also detached in Xie ’s work .
But on a practical spirit level , the fact that PFSA ’s flesh memory board arises more from heating plant methods than from special chemistry could be important , he say , allowing manufacturer to use less expensivematerials .
The bailiwick " shows you that the shape - computer memory property is a sight about the means you process and thermo - automatically treat the material , " Gall told TechNewsDaily .
The next footprint , Xie said , is to expect for configuration - shifting materials that also have other useful properties , like biocompatibility for aesculapian equipment or radical - violet radiation resistance for outer space equipment .
" The next thing is you want to expand it to a lot of other textile , or to make new fabric that will show this effect , " he said .
The research seem in the March 10 issue of the journal Nature .
