Confinement effects on the structure and dynamics of polymer systems from the mesoscale to the nanoscale
Confinement effects on the structure and dynamics of polymer systems from the mesoscale to the nanoscale
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DOI：
10.1002/polb.20460
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发表时间：
2005-07-01
影响因子：
--
通讯作者：
Noid, DW
中科院分区：
文献类型：
--
作者：
Barnes, MD;Mehta, A;Noid, DW
在这篇文章中，我们回顾了我们在一些聚合物和聚合物共混体系中产生、表征和模拟聚合物微粒和纳米粒子的实验和模拟方法方面的一些最新进展。通过使用为探测微米尺寸液滴中的单个荧光分子而开发的仪器，我们已经证明，几乎可以通过尺寸分散来制备几乎任意大小和组成的聚合物颗粒，该尺寸分散最终受到液滴中的链长和数量分布的限制。根据溶剂蒸发的时间尺度--我们实验中的一个可调参数--可以通过限制效应避免原本不相容的聚合物的相分离，并且可以产生均匀的聚合物混合微粒或纳米颗粒。这些颗粒具有可调节的特性，可以通过简单地调整颗粒的大小或溶液中聚合物组分的相对质量分数来控制。各种不同大小和组成的微粒和纳米颗粒的物理、光学和机械性质已经通过大量的经典分子动力学计算结合实验进行了研究，以更深入地了解它们的结构、动力学和性质的基本性质。(C)2005年威利期刊公司。
In this article, we review some of our recent progress in experimental and simulation methods for generating, characterizing, and modeling polymer microparticles and nanoparticles in a number of polymer and polymer-blend systems. By using instrumentation developed for probing single fluorescent molecules in micrometer-sized liquid droplets, we have shown that polymer particles of nearly arbitrary size and composition can be made with a size dispersion that is ultimately limited by the chain length and number distribution within the droplets. Depending on the time-scale for solvent evaporation-a tunable parameter in our experiments-the phase separation of otherwise immiscible polymers can be avoided by confinement effects, and homogeneous polymer-blend microparticles or nanoparticles can be produced. These particles have tunable properties that can be controlled by the simple adjustment of the size of the particle or the relative mass fractions of the polymer components in solution. Physical, optical, and mechanical properties of a variety of microparticles and nanoparticles, differing in size and composition, have been examined with extensive classical molecular dynamics calculations in conjunction with experiments to gain deeper insights into the fundamental nature of their structure, dynamics, and properties. (c) 2005 Wiley Periodicals, Inc.