Jia Shiling, Zhao Ling, Wang Xiangyu, Chen Yunjing, Pan Hongwei, Han Lijing, Zhang Huiliang, Dong Lisong, Zhang Huixuan
School of materials science and engineering, Changchun University of Technology, Changchun 130012, China; Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
School of materials science and engineering, Changchun University of Technology, Changchun 130012, China.
Int J Biol Macromol. 2022 Mar 15;201:662-675. doi: 10.1016/j.ijbiomac.2022.01.126. Epub 2022 Jan 22.
Poly (lactic acid) (PLA) blends with different toughening agents were prepared by melt compounding, and the effects of toughening agents on the toughness of PLA, especially the low-temperature toughness, were investigated. All blends were immiscible systems, but the rheological Cole-Cole diagram showed that the blends had certain compatibility, and the interfacial bonding of PLA/Ethylene/butyl methacrylate/Glycidyl Methacrylate Terpolymer (GEBMA) blend was the best. With addition of the toughening agents, all blends showed improvement of the tensile and impact toughness both at room temperature and low temperature. GEBMA was the best toughening agent, the elongation at break and impact strength at room temperature and low temperature were greatly improved. The elongation at break, tensile strength and impact strength of PLA blend with 20 wt% GEBMA at -20 °C was 55.8 MPa, 195.9% and 18.8 kJ/m, respectively, which showed the reinforcement and super ductility at low temperature. However, the toughening effect of Poly (propylene carbonate) polyurethane (PPCU) at low temperature was poor. The T and interfacial bonding were the main factors affecting the toughness of the blends, especially at low temperature. The lower the T and the better the interfacial bonding, the better the toughness of the blends.
通过熔融共混制备了聚乳酸（PLA）与不同增韧剂的共混物，并研究了增韧剂对PLA韧性，特别是低温韧性的影响。所有共混物均为不相容体系，但流变学的Cole-Cole图表明共混物具有一定的相容性，且聚乳酸/乙烯/甲基丙烯酸丁酯/甲基丙烯酸缩水甘油酯三元共聚物（GEBMA）共混物的界面结合性能最佳。添加增韧剂后，所有共混物在室温及低温下的拉伸韧性和冲击韧性均有所提高。GEBMA是最佳增韧剂，其在室温及低温下的断裂伸长率和冲击强度均得到显著提高。含20 wt% GEBMA的PLA共混物在-20°C下的断裂伸长率、拉伸强度和冲击强度分别为55.8 MPa、195.9%和18.8 kJ/m，显示出低温下的增强和超延展性。然而，聚碳酸亚丙酯聚氨酯（PPCU）在低温下的增韧效果较差。玻璃化转变温度（Tg）和界面结合是影响共混物韧性的主要因素，尤其是在低温下。Tg越低且界面结合越好，共混物的韧性越好。
