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Enhanced mechanical properties of linear segmented shape memory poly(urethane-urea) by incorporating flexible PEG400 and rigid piperazine |
Xiao-Yan ZHANG, Yu-Fei MA, Yong-Gang LI, Pin-Pin WANG, Yuan-Liang WANG, Yan-Feng LUO() |
Key Lab of Biorheological Science and Technology (Ministry of Education), Research Center for Bio-inspired Material Science and Engineering, College of Bioengineering, Chongqing University, Chongqing 400030, China |
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Abstract The goal of this study is to design and synthesize a linear segmented shape memory poly(urethane-urea) (SMPUU) that possesses near-body-temperature shape memory temperature (Ttran) and enhanced mechanical properties by incorporating flexible poly(ethylene glycol) 400 (PEG400) to form poly(D,L-lactic acid)-based macrodiols (PDLLA--PEG400--PDLLA) and then rigid piperazine (PPZ) as a chain extender to form the desired SMPUUs (PEG400--PUU--PPZ). PEG400 increased Mn while maintaining a lower Tg of PDLLA--PEG400--PDLLA, which together with PPZ improved the mechanical properties of PEG400--PUU--PPZ. The obtained optimum SMPUU with enhanced mechanical properties (σy = 24.28 MPa; ?f = 698%; Uf = 181.5 MJ/m3) and a Tg of 40.62°C exhibited sound shape memory properties as well, suggesting a promising SMPUU for in vivo biomedical applications.
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Keywords
poly(urethane-urea)
poly(D
L-lactic acid)
poly(ethylene glycol)
piperazine
shape memory property
mechanical property
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Corresponding Author(s):
LUO Yan-Feng,Email:yfluo@cqu.edu.cn
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Issue Date: 05 December 2012
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