Superior thermal stability and fast crystallization behavior of a novel, biodegradable α-methylated bacterial polyester

Abstract Given their ubiquity in modern society, the development of biodegradable and renewably sourced plastics is essential for creation an environmentally sustainable society. One drawbacks currently available such as poly( l -lactic acid) (PLLA) polyhydroxyalkanoates (PHAs) that it difficult to simultaneously achieve mechanical flexibility certain crystallization behavior these materials, which limits use replacements established petroleum-based isotactic polypropylene (iPP). Here, we report synthesis characterization a new plastic, poly(3-hydroxy-2-methylbutyrate) [P(3H2MB)], member bacterial PHA family whose members include α-methylated monomer unit. Biosynthesis P(3H2MB) was achieved using recombinant Escherichia coli expressing engineered pathway. Biosynthesized exhibited highest melting temperature (197 °C) among biosynthesized PHAs improved thermal resistance. It also nearly equal those iPP. The primary nucleation rate faster than P(3HB), spherulite morphology much finer P(3HB). This crystal may result more rapid behavior, increased transparency, enhanced properties. superior physical properties have potential open avenues production high-performance replacing bulk commodity plastics.