Thermal expansion and spherulite cracking in 3-hydroxybutyrate/3-hydroxyvalerate copolymers
β Scribed by J. Martinez-Salazar; M. Sanchez-Cuesta; P. J. Barham; A. Keller
- Publisher
- Springer
- Year
- 1989
- Tongue
- English
- Weight
- 221 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0261-8028
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## Abstract A strain of __Escherichia coli__ was metabolically engineered to produce poly(3βhydroxybutyrateβ__co__β3βhydroxyvalerate) (PHBV) of specified composition between 5% and 18% HV. A gene encoding propionylβCoA synthetase (__prpE__ from __S. enterica__) was placed under the control of the I
Water sorption and diffusion have been investigated in poly(3-hydroxybutyrate) (PHB) and three poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers [P(HB-HV)] by means of a Cahn electromicrobalance. Permeability of these samples have been determined using a gravimetric permeation cell. Two experi
CO 2 sorption and diffusion in poly(3-hydroxybutyrate) and three poly(3hydroxybutyrate-co-3-hydroxyvalerate) copolymers were investigated gravimetrically at temperatures from 25Β°to 50Β°C and pressures up to 1 atm. The sorption behavior proved to be linear for all the copolymers studied. An additional