Abstract
Poly(3-hydroxybutyrate) [P(3HB)] and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] are produced by various microorganisms as an intracellular carbon and energy reserve from agricultural feedstocks such as sugars and plant oils under unbalanced growth conditions. P(3HB) and P(3HB-co-3HV) have attracted the attention of academia and industry because of its biodegradability, biocompatibility, thermoplasticity, and plastic-like properties. This review first introduced the isodimorphism, spherulites, and molecular interaction of P(3HB) and P(3HB-co-3HV). In addition, the effects of 3HV content on the melting temperature and crystallization rate were discussed. Then the drawbacks of P(3HB) and P(3HB-co-3HV) including brittleness, narrow melt processing window, low crystallization rate, slow biodegradation rate in body, and so on were summarized. At last, the preparation, structure, and properties of P(3HB) and P(3HB-co-3HV) fiber were introduced.
Highlights
Polyhydroxyalkanoates (PHAs) are a kind of biodegradable and biocompatible polyesters produced by various microorganisms as an intracellular carbon and energy reserve from agricultural feedstocks such as sugars and plant oils under unbalanced growth conditions [1, 2]
The results showed that P(3HB-co-3HV) copolymers with low HV content have CH3 ⋅ ⋅ ⋅ O=C hydrogen bonds in P(3HB) lattice, whereas P(3HB-co-3HV) with high 3HV content has CH2 ⋅ ⋅ ⋅ O=C hydrogen bonds in P(3HV) lattice
Some drawbacks for P(3HB) and P(3HB-co-3HV) exist, including brittleness, poor thermal stability, slow crystallization rate, and so on, which restrict the wide application of P(3HB) and P(3HB-co-3HV)
Summary
Polyhydroxyalkanoates (PHAs) are a kind of biodegradable and biocompatible polyesters produced by various microorganisms as an intracellular carbon and energy reserve from agricultural feedstocks such as sugars and plant oils under unbalanced growth conditions [1, 2]. The ideal life cycle of microbially-produced PHAs is a closed-loop process Plants such as corn, sugarbeet, or wheat use the sun’s energy to convert water and carbon dioxide in the atmosphere into sugar inside the plant tissue via photosynthesis. Renewability, biodegradability, good biocompatibility, and mechanical properties similar to PP and PET, P(3HB) and P(3HB-co-3HV) have recently attracted much public and industrial interest as substitute of the fossils fuels They have been evaluated for a variety of applications, which include environmentally friendly materials and biomedical materials for controlled release, surgical sutures, wound dressings, lubricating powders, tissue engineering, and so on [18, 19]. In this review, literatures on drawbacks and fiber of P(3HB) and P(3HB-co-3HV) and some new results on crystallization behavior and crystalline structure of P(3HB) and P(3HB-co-3HV) will be reviewed
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