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Shape Memory Effect of Bacterial Poly[(3‐hydroxybutyrate)‐ co ‐(3‐hydroxyvalerate)]
Author(s) -
Kim Young Baek,
Chung Chung Wook,
Kim Hyung Woo,
Rhee YoungHa
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200500156
Subject(s) - shape memory alloy , shape memory polymer , polymer , materials science , annealing (glass) , composite material , electromagnetic coil , shrinkage , physics , quantum mechanics
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.