The effect of processing on the properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers
β Scribed by R. Chambers; J. H. Daly; D. Hayward; J. J. Liggat
- Book ID
- 110367391
- Publisher
- Springer
- Year
- 2001
- Tongue
- English
- Weight
- 157 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0022-2461
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It is proposed that melt-extrusion of poly(3-hydroxybutyrate-co-3hydroxyvalerate) at varying processing temperatures and screw speeds causes changes in the atomic positioning of the oxygen atoms in the helix structure due to torsion of the main chain bonds. By wide angle X-ray scattering it was obse
## Abstract **Summary:** A bacterial poly[(3βhydroxybutyrate)β__co__β(3βhydroxyvalerate)] biosynthesized by __Pseudomonas__ sp. HJβ2 was found to be a shape memory polymer. Permanent shapes were set by annealing at room temperature the samples that had been preβtreated above 95βΒ°C in specified shap
The influence of thermal history on the properties of commercial P(3HB-co-l2%-3HV) was studied. Thermogravimetric analysis and differential scanning calorimetry revealed that the plasticizer evaporated at 140Β°C or higher. The loss of plasticizer during thermal treatment at 170 and 180Β°C resulted in