Watanabe Ryota, Sugahara Aki, Hagihara Hideaki, Sakamoto Kei, Nakajima Yumiko, Naganawa Yuki
Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8565, Japan.
Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8565, Japan.
ACS Omega. 2020 May 18;5(21):12431-12439. doi: 10.1021/acsomega.0c01198. eCollection 2020 Jun 2.
Simultaneous improvement in the mechanical properties and lifetime of polymer nanocomposites is crucially significant to further extend the versatility of polymer materials and reduce environmental impact. In this study, we fabricated reinforced polypropylene (PP)-based nanocomposites with improved aging stability by the addition of surface-modified well-ordered silica nanospheres with a silane coupling agent (SCA) containing hindered phenol antioxidant as a filler. Uniform grafting of the SCA on the filler surface contributed to homogeneous dispersion of the filler into the matrix, leading to improved properties (e.g., stiffness and ductility) and uniform distribution of the antioxidant component into the entire nanocomposite by filler dispersion. The grafting of SCA also likely provides an inhibitory effect on antioxidant migration, which leads to loss of polymer stability during the aging process. This novel idea for the material design of PP-based nanocomposites, which simultaneously enhances their mechanical properties and lifetime, is promising for application in the fabrication of various types of polymer nanocomposites.
同时提高聚合物纳米复合材料的机械性能和使用寿命对于进一步拓展聚合物材料的多功能性以及减少环境影响至关重要。在本研究中，我们通过添加经表面改性的、具有良好有序结构的二氧化硅纳米球（用含有受阻酚抗氧化剂的硅烷偶联剂（SCA）进行改性）作为填料，制备了具有改善的老化稳定性的增强聚丙烯（PP）基纳米复合材料。SCA在填料表面的均匀接枝有助于填料在基体中的均匀分散，从而改善性能（如刚度和延展性），并通过填料分散使抗氧化剂成分在整个纳米复合材料中均匀分布。SCA的接枝还可能对抗氧化剂的迁移起到抑制作用，而抗氧化剂迁移会导致老化过程中聚合物稳定性的丧失。这种用于PP基纳米复合材料材料设计的新方法，能同时提高其机械性能和使用寿命，在各类聚合物纳米复合材料的制备中具有应用前景。
