Toyonaga Masahito, Chammingkwan Patchanee, Terano Minoru, Taniike Toshiaki
School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
Polymers (Basel). 2016 Aug 12;8(8):300. doi: 10.3390/polym8080300.
Grafting terminally functionalized polypropylene (PP) to nanofillers provides well-defined PP-based nanocomposites plausibly featured with a physical cross-linkage structure. In this paper, a series of PP-grafted silica nanoparticles (PP--SiO₂) were synthesized by varying the number of grafted chains per silica particle, and influences of the number and the molecular weight of grafted chains were studied on physical properties of PP/PP--SiO₂ nanocomposites. We found that only 20⁻30 chain/particle was sufficient to exploit benefits of the PP grafting for the nanoparticle dispersion, the nucleation, and the Young's modulus. Meanwhile, the yield strength was sensitive to both of the number and the molecular weight of grafted PP: Grafting longer chains at a higher density led to greater reinforcement.
将末端官能化的聚丙烯（PP）接枝到纳米填料上可制备出具有明确结构的基于PP的纳米复合材料，其可能具有物理交联结构。本文通过改变每个二氧化硅颗粒上接枝链的数量，合成了一系列PP接枝二氧化硅纳米颗粒（PP-SiO₂），并研究了接枝链的数量和分子量对PP/PP-SiO₂纳米复合材料物理性能的影响。我们发现，仅20-30条链/颗粒就足以发挥PP接枝对纳米颗粒分散、成核和杨氏模量的有益作用。同时，屈服强度对接枝PP的数量和分子量都很敏感：以更高的密度接枝更长的链会导致更大的增强效果。
