Xu Ruilong, Zhao Feng, Pang Li, Zhao Shuai, Li Lin
Key Lab of Rubber-Plastics, Ministry of Education/Shandong Provincial Key, Lab of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.
Key Lab of Rubber-Plastics, Ministry of Education/Shandong Provincial Key, Lab of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.
Int J Biol Macromol. 2025 Sep 3;327(Pt 1):147370. doi: 10.1016/j.ijbiomac.2025.147370.
A dynamically crosslinked network VEC (vulcanized ESO and CA) was synthesized in situ via zinc acetate-catalyzed epoxy ring-opening between epoxidized soybean oil (ESO) and anhydrous citric acid (CA), then incorporated into polylactic acid (PLA)/polybutylene adipate terephthalate (PBAT) blends to enhance interfacial compatibility. The dynamic ester-exchange network acted as an intermediate phase, improving the integration of the flexible PBAT phase within the rigid PLA matrix. VEC content critically influenced mechanical properties, with in-situ crosslinking during dynamic vulcanization enhancing chain interactions and blend homogeneity. The optimized composite exhibited elongation at break and impact strength of 434.67 % and 9.12 kJ/m, corresponding to 1.61- and 2.02-fold increases over PLA/PBAT (70/30). The blends exhibit reprocessability, and after recycling and remolding, the elongation at break achieves 325.875 %, representing a 1.2-fold enhancement compared to PLA/PBAT (70/30). The incorporation of the dynamic crosslinked solidification network VEC significantly improves the melt strength of the PLA/PBAT blends, and the composites achieved complete degradation under alkaline conditions and enhanced hydrophobicity. SYNOPSIS: In this paper, epoxidized soybean oil curing network is introduced into PLA/PBAT to obtain biodegradable materials with excellent properties.
通过乙酸锌催化环氧化大豆油（ESO）与无水柠檬酸（CA）之间的环氧开环反应，原位合成了一种动态交联网络VEC（硫化ESO和CA），然后将其引入聚乳酸（PLA）/聚己二酸丁二醇酯对苯二甲酸酯（PBAT）共混物中以增强界面相容性。动态酯交换网络作为中间相，改善了柔性PBAT相在刚性PLA基体中的整合。VEC含量对机械性能有至关重要的影响，动态硫化过程中的原位交联增强了链间相互作用和共混物的均匀性。优化后的复合材料的断裂伸长率和冲击强度分别为434.67%和9.12 kJ/m，相比于PLA/PBAT（70/30）分别提高了1.61倍和2.02倍。该共混物具有可再加工性，回收再成型后，断裂伸长率达到325.875%，相比于PLA/PBAT（70/30）提高了1.2倍。动态交联固化网络VEC的引入显著提高了PLA/PBAT共混物的熔体强度，并且该复合材料在碱性条件下实现了完全降解并增强了疏水性。摘要：本文将环氧化大豆油固化网络引入PLA/PBAT中，以获得具有优异性能的生物可降解材料。
