Shrink-Resistant Poly(butylene adipate-co-terephthalate) Foam Reinforced with Crystalline Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Particles AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c01348

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Poly(butylene adipate-co-terephthalate) (PBAT) foam blown with CO2 exhibits severe shrinkage problems, with a substantial post-foaming shrinkage ratio reaching up to 80%. In this study, we reported a useful method to prepare PBAT foams with good dimensional stability by simply optimizing the polymer blending ratios and foaming conditions. The foaming behaviors showed that the PBAT/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) blend with a mass ratio of 80/20 possessed an expansion ratio of up to 29.3 at 110 °C, with a shrinkage ratio of less than 5%. Moreover, the presence of 20 wt % PHBV in PBAT melt could not only facilitate the open-cell structure but also improve the stiffness of the cell walls. A possible mechanism for the reinforced foam stability is proposed based on the results of the CO2 desorption experiment and foam morphology observation.