School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, PR China; Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing Technology and Business University, Beijing 100048, PR China.
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, 15 North Third Ring Road, Beijing 100029, PR China; Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, 15 North Third Ring Road, Beijing 100029, PR China.
Int J Biol Macromol. 2022 Nov 1;220:1163-1176. doi: 10.1016/j.ijbiomac.2022.08.130. Epub 2022 Aug 27.
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a type of promising bio-based thermoplastic for food packaging but find restricted industrial applications due to its brittleness and poor processability that is caused by its large spherulite sizes. In this study, for the purpose of toughening PHBV, bio-based engineering polyester elastomers (BEPE) were synthesized and blended with PHBV to prepare fully bio-based blends. In order to improve the compatibility and toughness of the BEPE/PHBV blends, epoxy-terminated hyperbranched polyesters (EHBP) were synthesized, which could be homogeneously dispersed into the PHBV/BEPE blends and improve the compatibility between the two phases of the matrix. The results showed that compared to those of the PHBV/BEPE blends, the elongation at break, impact strength and tensile toughness of the PHBV/BEPE blends with 3.0phr EHBP were enhanced by 134.2 %, 76.8 %, and 123.5 %, respectively. The crystallization study demonstrated the crystallization rate of PHBV/BEPE blends decreased due to the addition of EHBP. The reasons lied in that the addition of EHBP leads to chemical cross-linking between PHBV and BEPE. Meanwhile, the formation of hydrogen bonding, co-crystallization and chain entanglement increased the adhesion between PHBV and BEΡE, which generated the superior toughness of the blends.
聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）是一种有前途的生物基热塑性塑料，可用于食品包装，但由于其较大的球晶尺寸导致其脆性和加工性能差，限制了其在工业中的应用。在这项研究中，为了增韧 PHBV，合成了生物基工程聚酯弹性体（BEPE）并与 PHBV 共混制备了完全生物基共混物。为了提高 BEPE/PHBV 共混物的相容性和韧性，合成了端环氧超支化聚酯（EHBP），它可以均匀分散在 PHBV/BEPE 共混物中，改善基体两相之间的相容性。结果表明，与 PHBV/BEPE 共混物相比，添加 3.0phr EHBP 的 PHBV/BEPE 共混物的断裂伸长率、冲击强度和拉伸韧性分别提高了 134.2%、76.8%和 123.5%。结晶研究表明，由于 EHBP 的加入，PHBV/BEPE 共混物的结晶速率降低。原因在于 EHBP 的加入导致 PHBV 和 BEPE 之间发生化学交联。同时，氢键的形成、共结晶和链缠结增加了 PHBV 和 BEΡE 之间的附着力，从而提高了共混物的韧性。
