Fast Polymer Diffusion through Nanocomposites with Anisotropic Particles.
Fast Polymer Diffusion through Nanocomposites with Anisotropic Particles.
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DOI：
10.1021/mz500344h
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发表时间：
2014-08
影响因子：
5.8
通讯作者：
Jihoon Choi;N. Clarke;K. Winey;R. Composto
中科院分区：
文献类型：
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作者：
Jihoon Choi;N. Clarke;K. Winey;R. Composto
聚合物纳米复合材料（PNC）具有与纳米颗粒（即，尺寸和颗粒间距离）和聚合物分子（即，缠绕管直径和回转半径; Rg）。当纳米颗粒（NP）和聚合物的长度尺度是可比的，聚合物动力学表现出对比行为的NP不同，只有在大小和形状。对于球形纳米粒子和短各向异性纳米粒子，聚合物扩散系数随纳米粒子浓度单调下降。然而，对于长的各向异性NP，聚合物扩散在低NP浓度下减慢，并且在高于网络形成的临界浓度的NP浓度下恢复。通过跨越纳米颗粒尺寸和形状的中间范围，NP几何参数对聚合物动力学的作用大大提高，从而提供了控制聚合物动力学和PNC粘弹性的新途径。
Polymer nanocomposites (PNCs) have characteristic length scales associated with both the nanoparticles (i.e., size and interparticle distance) and the polymer molecules (i.e., tube diameter of entanglement and radius of gyration; Rg). When the nanoparticle (NP) and polymer length scales are comparable, the polymer dynamics exhibit contrasting behavior for NPs differing only in size and shape. For spherical NPs and short anisotropic NPs, the polymer diffusion coefficient decreases monotonically with NP concentration. However, for long anisotropic NPs, polymer diffusion slows down at low NP concentration and recovers for NP concentrations above the critical concentration for network formation. By spanning intermediate ranges of nanoparticle size and shape, the role of the NP geometric parameters on the polymer dynamics is substantially advanced, thereby providing new routes toward controlling polymer dynamics and viscoelasticity of PNCs.