【摘 要】
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Switching temperatures in the physiological range are required,if the potential of the recently discovered bidirectional shape-memory effect(rbSME)[1,2] in
【机 构】
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Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies,Helmholtz-
论文部分内容阅读
Switching temperatures in the physiological range are required,if the potential of the recently discovered bidirectional shape-memory effect(rbSME)[1,2] in polymers should be utilized for biomedical applications.In copolymer networks from oligo(ε-caprolactone)(OCL)and n-butyl acrylate(BA)an extension of the melting temperature range(ΔTm)of the actuating OCL domains can be achieved by using blends of OCL of different molecular weight.The crystallizable OCL domains in the temperature range between room and body temperature are acting as actuating domains.The geometry of the movement is maintained by the molecular orientation of the amorphous domains,which provide an orientational memory.In this way the reversible effect can be adjusted to the human body temperature.The mixtures of OCLs enabled broad melting temperature ranges(ΔTm)from 2 ℃ to 50 ℃ and from-10 ℃ to 37 ℃,respectively for two series of copolymer networks.[3] In a temperature interval between 20 ℃ and 37 ℃ the copolymer networks provided pronounced actuation as determined in cyclic,thermomechanical experiments.Furthermore,a rbSME in the temperature range close or even above Tm,offset(end of the melting transition)could be obtained,which was attributed to an orientational memory of the molten OCL domains when Tm,offset was exceeded.In conclusion,the application spectrum of the rbSME could be extended to biomedical applications and a new mechanism of the rbSME was found.
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