Silent elongation of polyrotaxane and its composites
Silent elongation of polyrotaxane and its composites
复制标题
DOI：
10.1063/5.0138984
复制
发表时间：
2023-04
期刊：
影响因子：
1.6
通讯作者：
Masaki Iida;Tsuyohito Ito;H. Muneoka;Y. Shimizu;Y. Hakuta;K. Ito;K. Terashima
中科院分区：
文献类型：
--
作者：
Masaki Iida;Tsuyohito Ito;H. Muneoka;Y. Shimizu;Y. Hakuta;K. Ito;K. Terashima
聚轮烷（PR）因其独特的机械性能而引起了人们的极大兴趣，通过其滑环拓扑结构表现出滑轮效应。由 PR 和无机颗粒组成的柔性功能复合材料，特别是那些经过等离子体表面改性的材料，即使存在大量无机颗粒，也表现出更高的韧性。在本研究中，我们通过测量声发射（AE）验证了纯PR及其与石墨烯纳米板或碳纳米纤维的复合材料的效果。对每个样品进行多次同时 AE 和拉伸测量，并获取伸长过程中的 AE 信号。结果表明，传统的固定交联弹性体材料在整个拉伸区域显示出AE信号，而PR的可移动交联材料几乎没有显示AE信号计数。这表明纯 PR 在通过滑轮效应最终断裂之前几乎没有微观断裂。具有等离子体表面改性填料的 PR 复合材料显示出比未改性填料更少的 AE 信号。这可能是由于填料的表面改性，改善了填料的分散性和/或防止了交联点移动性的大幅下降。
Polyrotaxanes (PR) have attracted great interest due to their unique mechanical properties, exhibiting the pulley effect, via their slide-ring topological structure. Flexible and functional composite materials consisting of PR and inorganic particles, particularly those with plasma-surface modifications, have also shown higher toughness, even with large amounts of inorganic particles present. In this study, we verified the effect of neat PR and its composites with graphene nanoplates or carbon nanofibers by measuring acoustic emission (AE). Simultaneous AE and tensile measurements were tested several times for each sample, and AE signals during elongation were acquired. It revealed that the conventional fixed cross-linked elastomer materials showed AE signals in the entire tensile region, while the movable-cross-linked materials of PR showed almost no AE signal counts. This suggests that neat PR had almost no microscopic fracture before final breakage via the pulley effect. PR composites with plasma-surface-modified fillers showed a lower number of AE signals than that with unmodified fillers. This might be due to the surface modification of fillers, which improved filler dispersibility and/or prevented a large drop in the mobility of cross-linking points.