Shape Memory Effect of Bacterial Poly[(3-hydroxybutyrate)-co-(3-hydroxyvalerate)]

A bacterial poly[(3‐hydroxybutyrate)‐co‐(3‐hydroxyvalerate)] biosynthesized by Pseudomonas sp. HJ‐2 was found to be a shape memory polymer. Permanent shapes were set by annealing at room temperature the samples that had been pre‐treated above 95 °C in specified shapes. The temporary shapes were set...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2005-07, Vol.26 (13), p.1070-1074
Main Authors: Kim, Young Baek, Chung, Chung Wook, Kim, Hyung Woo, Rhee, Young-Ha
Format: Article
Language:English
Subjects:
Applied sciences
biopolymers
Exact sciences and technology
Mechanical properties
Organic polymers
phase behavior
Physicochemistry of polymers
Properties and characterization
shape memory effect
tension
thermal properties
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Summary:A bacterial poly[(3‐hydroxybutyrate)‐co‐(3‐hydroxyvalerate)] biosynthesized by Pseudomonas sp. HJ‐2 was found to be a shape memory polymer. Permanent shapes were set by annealing at room temperature the samples that had been pre‐treated above 95 °C in specified shapes. The temporary shapes were set by stretching and holding the elongated samples. Thermal shrinkage began at 45 °C and stopped at 75 °C to recover to their permanent shapes. Apparently, the orientation induced the formation of hard segments that were responsible for setting the temporary shapes. The shape memory effect of this polymer was explained based on the DSC and XRD results at different phases. The recovery of a coil shape upon heating a strip of HJ‐2 PHB35V, demonstrating the polymers shape memory effect.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.200500156