High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment
Abstract
:1. Introduction
2. Experiments
2.1. Synthesis of SMPUs
Sample | MDI | IPDI | γ |
---|---|---|---|
PEG-H1, PCL-S1 | 19.95 | 0 | 1.0 |
PEG-H2, PCL-S2 | 16.5 | 3.37 | 0.83 |
PEG-H3, PCL-S3 | 13.36 | 6.65 | 0.668 |
PEG-H4, PCL-S4 | 10.0 | 10.0 | 0.50 |
PEG-H5, PCL-S5 | 6.6 | 13.7 | 0.325 |
2.2. Characterization of Crystal Structure and Thermal Properties
2.3. Characterization of Shape Memory Properties
3. Results and Discussions
3.1. Thermal Property and Crystallinity
Sample | Weight Loss at (410 °C) | Tm | ΔHf | Stress at Break | Strain at Break |
% | °C | Jg−1 | MPa | % | |
Peg-6000 | N/A | 65.0 | 822.0 | N/A | N/A |
PEG-H1 | 86 | 43.6 | 59.5 | 4.49 | 425 |
PEG-H2 | 88 | 46.3 | 75.6 | 5.15 | 170 |
PEG-H3 | 92 | 50.0 | 79.4 | 5.40 | 110 |
PEG-H4 | 90 | 46.0 | 71.6 | 6.37 | 50 |
PEG-H5 | 94 | 47.0 | 83.4 | 8.20 | 12 |
PCL-2000 | N/A | 51.6 | 76.6 | N/A | N/A |
PCL-S1 | 94 | 40.3 | 8.6 | 6.99 | 930 |
PCL-S2 | 94 | 41.3 | 18.8 | 6.24 | 869 |
PCL-S3 | 94 | 44.3 | 23.4 | 5.64 | 790 |
PCL-S4 | 98 | 42.6 | 20.5 | 4.39 | 334 |
PCL-S5 | 98 | 43.3 | 27.2 | 3.06 | 192 |
3.2. Thermal Mechanical Properties
3.3. Shape Memory Properties
3.3.1. Recovery Stress
3.3.2. Shape Recovery Ratio and Shape Fixity
3.4. Physical Shape Recovery Test
4. Conclusions
- The PEG-SMPUs show a slightly better thermal stability than PCL-SMPUs. Both sample series have transition temperatures between 40~50 °C, suitable for medical device applications.
- The PEG-SMPUs have a higher crystallinity and lower phase compatibility than those of PCL-SMPU samples. With the increase of IPDI concentration, the crystallinity increases, leading to deteriorated phase compatibility and shape memory effect for both the sample series.
- The PCL-SMPUs have larger elongations at break and recovery stresses than those of the PEG-SMPUs, i.e., high mechanical strength at room temperature. Longer molecular chains, lower cross-link density and higher crystallinity are believed to be responsible for the weaker thermal mechanical properties of the PEG-SMPUs.
- The PEG-SMPUs have a higher recovery ratio, a higher fixity and a much shorter shape recovery time, and demonstrate superior SME effect as compared to the PCL-SMPUs. SMPUs with high molecular weight polyol can be excellent candidates for applications in engineering and as microactuators, in particular when fast actuation is required.
Acknowledgements
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Ahmad, M.; Xu, B.; Purnawali, H.; Fu, Y.; Huang, W.; Miraftab, M.; Luo, J. High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment. Appl. Sci. 2012, 2, 535-548. https://doi.org/10.3390/app2020535
Ahmad M, Xu B, Purnawali H, Fu Y, Huang W, Miraftab M, Luo J. High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment. Applied Sciences. 2012; 2(2):535-548. https://doi.org/10.3390/app2020535
Chicago/Turabian StyleAhmad, Manzoor, Bin Xu, Hendra Purnawali, Yongqing Fu, Weimin Huang, Mohsen Miraftab, and Jikui Luo. 2012. "High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment" Applied Sciences 2, no. 2: 535-548. https://doi.org/10.3390/app2020535