Dobrzyńska-Mizera Monika, Knitter Monika, Mallardo Salvatore, Del Barone Maria Cristina, Santagata Gabriella, Di Lorenzo Maria Laura
Institute of Materials Technology, Polymer Division, Poznan University of Technology, Piotrowo 3, 61-138 Poznan, Poland.
National Research Council (CNR), Institute of Polymers, Composites and Biomaterials (IPCB), c/o Comprensorio Olivetti, via Campi Flegrei, 34, 80078 Pozzuoli, NA, Italy.
Materials (Basel). 2021 May 15;14(10):2569. doi: 10.3390/ma14102569.
Bio-based composites made of poly(L-lactic acid) (PLLA) and β-cyclodextrin/d-limonene inclusion complex (CD-Lim) were prepared by melt extrusion. Encapsulation of volatile d-limonene molecules within β-cyclodextrin cages was proven to be a successful strategy to prevent evaporation during high-temperature processing. However, small amounts of limonene were released upon processing, resulting in the plasticization of the polymeric matrix. Morphological analysis revealed good dispersion of the filler, which acted as a nucleating agent, favoring the growth of PLLA crystals. The composites' lowered glass transition temperature upon the addition of CD-Lim was also proved by thermomechanical analysis (DMA). Moreover, DMA revealed constant stiffness of modified materials at room temperature, which is crucial in PLLA-based formulations.
通过熔融挤出制备了由聚（L-乳酸）（PLLA）和β-环糊精/ d-柠檬烯包合物（CD-Lim）制成的生物基复合材料。事实证明，将挥发性d-柠檬烯分子封装在β-环糊精笼中是防止高温加工过程中蒸发的成功策略。然而，加工过程中会释放少量柠檬烯，导致聚合物基体增塑。形态分析表明，用作成核剂的填料分散良好，有利于PLLA晶体的生长。热机械分析（DMA）也证明了添加CD-Lim后复合材料的玻璃化转变温度降低。此外，DMA显示改性材料在室温下具有恒定的刚度，这在基于PLLA的配方中至关重要。
