On the effects of moisture in a polyurethane shape memory polymer
Open accessAbstract
It was observed that the polyurethane shape memory polymer (SMP) loses its shape fixing capability after being exposed in the air at room temperature for several days. A significant indication for this change is the continuous decrease of the glass transition temperature ( T g ) of polyurethane. Accompanying the decrease of T g , the uniaxial tensile behaviour also changes. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) tests were carried out to find the cause behind this phenomenon. Moisture was concluded as the main reason. A mathematical expression was obtained for the relationship between T g and the moisture. Moreover, the polyurethane shape memory polymer can fully regain its original properties after being heated at temperatures above 180 °C, which is the melting temperature of this SMP.
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Triggering of SM effect in moisture-exposed SMPU was exclusively due to plasticizer effect of absorbed water molecules on polymer matrix.
“The triggering of the SM effect was thus exclusively due to the plasticizer effect of the absorbed water molecules onto the polymer matrix.”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [217]
Programmed SMPU specimens from MHI were not able to maintain their shape in humid air at 20 °C.
“The authors found that programmed specimens were not able to maintain their shape in humid air at 20 °C.”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [217]
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References 16 · Cited by 232
- Authors
- Yang, B., Huang, W. M., Li, C., Lee, C. M., & Li, L.
- Affiliations
- Nanyang Technological University (SG)
- Corresponding author
- Huang, W M
- Venue
- Smart Materials and Structures
- Publisher
- IOP Publishing
- Published
- 2003-12-15
- Volume
- 13
- Issue
- 1
- Pages
- 191-195
- ISSN
- 0964-1726 (ISSN-L)
- 1361-665X
- OpenAlex
- W2073120076
- Cited by
- 232
- References
- 16
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 10 · 2023: 10 · 2022: 10 · 2021: 13 · 2020: 8 · 2019: 18 · 2018: 8 · 2017: 14 · 2016: 14 · 2015: 16 · 2014: 14 · 2013: 15 · 2012: 9
- FWCI
- 3.58
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Smart Materials and Structures (publishedVersion)
- Funders
- Nanyang Technological University
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Hydrogels: synthesis, properties, applications
- Keywords
- moisture absorption, glass transition temperature, uniaxial tensile behavior, thermal degradation
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