Preparing a pseudo-solid by the reinforcement of a polydentate thioether using silver nanoparticles.
Preparing a pseudo-solid by the reinforcement of a polydentate thioether using silver nanoparticles.
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DOI：
10.1039/c4nr06834c
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发表时间：
2015-01
期刊：
影响因子：
6.7
通讯作者：
H. Pletsch;A. Greiner;S. Agarwal
中科院分区：
文献类型：
--
作者：
H. Pletsch;A. Greiner;S. Agarwal
从聚合物和贵金属纳米颗粒设计网络需要彻底控制拓扑聚合物粒子的排列。本研究探讨了线性多齿聚硫丙烯（ppr）配体与银纳米粒子（AgNPs）之间的相互作用，旨在研究其对力学和粘弹性性能的影响。极少量（0.30 vol%）的银纳米颗粒会显著增强ppr的机械强度，产生未固定网络的粘弹性特性，在机械刺激下具有类似固体的弹性响应。这些材料是通过开环阴离子聚合的方法得到的，每条链上总共有593个硫醚官能团的高摩尔质量ppr，然后通过简单的原位“接枝”方法将AgNPs均匀地结合到聚合物基体中。利用动态流变学对链动力学的研究得出结论，分散良好的AgNPs对聚合物链施加了额外的拓扑约束。统计粒子间距离的计算支持远端桥接聚合物-粒子排列。
The design of networks from polymers and noble metal nanoparticles requires thorough control over topological polymer-particle arrangements. This study explores the interaction between a linear polydentate poly(propylene sulfide) (PPrS) ligand and silver nanoparticles (AgNPs) with an aim to study its effect on mechanical and viscoelastic properties. Very low amounts (0.30 vol%) of silver nanoparticles lead to significant mechanical reinforcement of PPrS, yielding viscoelastic properties of an unfastened network with solid-like elastic responses on mechanical stimulation. The materials are made by ring-opening anionic polymerization of propylene sulfide to yield high molar mass PPrS with a total of 593 thioether functionalities per chain, followed by a simple in situ "grafting to" method to homogeneously incorporate AgNPs into the polymer matrix. From investigations on the chain dynamics using dynamic rheology it is concluded that well-dispersed AgNPs impose additional topological constraints on the polymer chains. Calculations of the statistical interparticle distances support a tele-bridging polymer-particle arrangement.