Poly (3-hydroxybutyrate) (PHB) is a homopolymer of 3-hydroxybutyrate and the most significant member of the biodegradable thermoplastic polyhydroxyalkanoate family, with characteristics of high melting temperature, a high degree of crystallinity, and low permeability to O 2, H 2 O, and CO 2. The structure of PHB is shown in Fig. 2. More @Wikipedia
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