Liu Cong, Feng Sinan, Zhu Zewen, Chen Qihui, Noh Kwanghae, Kotaki Masaya, Sue Hung-Jue
Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States.
Kaneka US Materials Research Center, Fremont, California 94555, United States.
Langmuir. 2020 Oct 13;36(40):11938-11947. doi: 10.1021/acs.langmuir.0c02029. Epub 2020 Sep 30.
The interfacial region between nanoparticles and polymer matrix plays a critical role in influencing the mechanical behavior of polymer nanocomposites. In this work, a set of model systems based on poly(methyl methacrylate) (PMMA) matrix containing poly(alkyl glycidyl ether) brushes grafted on 50 nm metal-organic-framework (MOF) nanoparticles were synthesized and investigated. By systematically increasing the polymer brush length and graft density on the MOF nanoparticles, the fracture behavior of PMMA/MOF nanocomposite changes from forming only a few large crazes to generating massive crazing and to undergoing shear banding, which results in significant improvement in fracture toughness. The implication of the present finding for the interfacial design of the nanoparticles for the development of high-performance, multifunctional polymer nanocomposites is discussed.
纳米粒子与聚合物基体之间的界面区域在影响聚合物纳米复合材料的力学行为方面起着关键作用。在这项工作中，合成并研究了一组基于聚甲基丙烯酸甲酯（PMMA）基体的模型体系，该基体包含接枝在50纳米金属有机框架（MOF）纳米粒子上的聚（烷基缩水甘油醚）刷。通过系统地增加MOF纳米粒子上聚合物刷的长度和接枝密度，PMMA/MOF纳米复合材料的断裂行为从仅形成少数大的银纹转变为产生大量银纹并经历剪切带，这导致断裂韧性显著提高。讨论了本研究结果对用于开发高性能、多功能聚合物纳米复合材料的纳米粒子界面设计的意义。
