Synthesis and characterization of polyurethane-based shape-memory polymers for tailored Tg around body temperature for medical applications

Ahmad, Manzoor, Luo, Jikui, Xu, Ben, Purnawali, Hendra, King, Peter, Chalker, Paul, Fu, Yong Qing, Huang, Wei Min and Miraftab, Mohsen (2011) Synthesis and characterization of polyurethane-based shape-memory polymers for tailored Tg around body temperature for medical applications. Macromolecular Chemistry and Physics, 212 (6). pp. 592-602. ISSN 1521-3935

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Official URL: http://dx.doi.org/10.1002/macp.201000540

Abstract

Various polyurethane-based SMPUs were synthesized using five types of polyols as soft segments and two different diisocyanates as hard segments. The effects of diisocyanate concentration on material properties such as crystallinity, transition temperature, shape-memory effect and tensile strength were investigated. SMPUs with a maximum strain near 1 000%, recovery rate up to ≈98%, fixity up to ≈90% and Tgs of 35–45 °C were obtained. A high MDI content results in SMPUs with better shape-memory effect, whereas increasing IPDI content leads to a weaker shape-memory effect. High IPDI concentration seems to prevent or restrict chemical reactions and crosslinks between the polyols and the hard segments, leading to large phase separation and coexistence of soft and hard segments in the macrophases.

Item Type: Article
Uncontrolled Keywords: diisocyanates and polyols, maximum strain, nanoparticles, polyurethanes, thermomechanical properties
Subjects: F100 Chemistry
F200 Materials Science
H300 Mechanical Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Bin Xu
Date Deposited: 06 Jun 2013 08:44
Last Modified: 10 Aug 2015 11:18
URI: http://nrl.northumbria.ac.uk/id/eprint/12775

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