Compatibility study of Plantago extract and its modified product/PBS antibacterial composites

This study extracted an antibacterial component from the natural plant Plantago asiatica L. to gain Plantago extract (PTE); PTE was then compounded with polybutylene succinate (PBS) to prepare an antibacterial composite material. To further improve the compatibility of PBS and PTE, chitosan (CS) and hydroxypropyl- β -cyclodextrin (H- β -CD) were used to modify PTE, resulting in the preparation of CS-PTE microcapsules and (H- β -CD)-PTE microcapsules. And CS-PTE microcapsules and (H- β -CD)-PTE microcapsules were added to PBS at different ratios to prepare PBS/CS-PTE and PBS/(H- β -CD)-PTE composite materials. FTIR and SEM tests showed that both microcapsules were successfully prepared and confirmed the antibacterial activity of PTE by inhibition circles method. The binding energy of the composites shifted slightly, indicating that the microcapsules formed intermolecular forces with PBS. The 2 θ angular strength of XRD gradually weakened with the increase in microcapsule addition, and the crystallinity decreased, as well as the thermal and mechanical properties. However, the thermal properties were better than those of PTE/PBS composites, and the thermal properties better than PTE/PBS composites. The hydrophilicity of PBS/(H- β -CD)-PTE composites improved significantly with the addition of microcapsules. The molecular simulation results showed that the intermolecular interaction between PBS and CS-lignans was stronger, and its compatibility was better.