On the effects of moisture in a polyurethane shape memory polymer

B. Yang; W. M. Huang; C. Li; C. M. Lee; L. Li

doi:10.1088/0964-1726/13/1/022

On the effects of moisture in a polyurethane shape memory polymer

B. Yang, W. M. Huang^*, C. Li, C. M. Lee, L. Li

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

223 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	191-195
Number of pages	5
Journal	Smart Materials and Structures
Volume	13
Issue number	1
DOIs	https://doi.org/10.1088/0964-1726/13/1/022
State	Published - Feb 2004

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title = "On the effects of moisture in a polyurethane shape memory polymer",

abstract = "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 (Tg) of polyurethane. Accompanying the decrease of Tg, 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 Tg 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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AU - Yang, B.

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AU - Lee, C. M.

AU - Li, L.

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AB - 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 (Tg) of polyurethane. Accompanying the decrease of Tg, 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 Tg 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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On the effects of moisture in a polyurethane shape memory polymer

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