Jing Ying, Zhang Yutong, Bai Xiaohan, Qiu Ying, Cong Fei, Yu Lingxiao, Gao Guangxu, Huang Jiangting, Leng Siyin, Wang Ning, Geng Xiliang, Gao Jialu, Li Yongchao, Hao Yongsheng, Wang Yuanxia, Song Lixin
Liaoning Provincial Key Laboratory for Synthesis and Preparation of Special Functional Materials, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China.
Center of Implantology, School and Hospital of Stomatology, China Medical University, Shenyang 110122, Liaoning, China.
Int J Biol Macromol. 2025 Aug;319(Pt 4):145604. doi: 10.1016/j.ijbiomac.2025.145604. Epub 2025 Jun 26.
To overcome the limitations of poly(lactic acid) (PLA), such as poor toughness, high cost, and slow degradation, this study prepares PLA/PBAT/DBI blends via melt blending by introducing poly(butylene adipate-co-terephthalate) (PBAT) and a bio-based additive, dibutyl itaconate (DBI). DBI, a multifunctional small molecule exhibiting both plasticizing and compatibilizing capabilities, has found broad applicability across diverse fields. However, its compatibilization mechanism in polymer blend systems remains insufficiently studied. Experimental results demonstrate that DBI's reactive CC bonds chemically interact with PLA and PBAT chains, enhancing interfacial adhesion. With 12 phr DBI, the glass transition temperature difference (ΔT) decreased by 13.81 °C, while elongation at break and impact strength increased by 5.16 and 2.77 times, respectively. The Vicat softening point rose from 82.6 °C to 93.5 °C. DBI also promoted degradation, yielding a weight loss rate 2.2 times higher than the control. These results suggest DBI acts as a dual-function additive that effectively improves compatibility, flexibility, and degradability, offering a promising route to high-performance biodegradable PLA-based materials for packaging and film applications.
为克服聚乳酸（PLA）的局限性，如韧性差、成本高和降解缓慢等问题，本研究通过熔融共混法制备了PLA/PBAT/DBI共混物，其中引入了聚己二酸-对苯二甲酸丁二醇酯（PBAT）和一种生物基添加剂衣康酸二丁酯（DBI）。DBI是一种兼具增塑和增容能力的多功能小分子，已在多个领域得到广泛应用。然而，其在聚合物共混体系中的增容机理仍研究不足。实验结果表明，DBI的反应性碳-碳键与PLA和PBAT链发生化学相互作用，增强了界面附着力。当添加12份DBI时，玻璃化转变温度差（ΔT）降低了13.81℃，而断裂伸长率和冲击强度分别提高了5.16倍和2.77倍。维卡软化点从82.6℃升至93.5℃。DBI还促进了降解，失重率比对照组高2.2倍。这些结果表明，DBI作为一种双功能添加剂，有效地改善了相容性、柔韧性和降解性，为用于包装和薄膜应用的高性能可生物降解PLA基材料提供了一条有前景的途径。
