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Polymers at Liquid/Vapor Interface

机译:液体/蒸气界面处的聚合物

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摘要

src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/amlccd/2017/amlccd.2017.6.issue-11/acsmacrolett.7b00466/20171115/images/medium/mz-2017-00466b_0006.gif">Polymers confined to the liquid/vapor interface are studied using molecular dynamics simulations. We show that for polymers which are weakly immiscible with the solvent, the density profile perpendicular to the liquid/vapor interface is strongly asymmetric. On the vapor side of the interface, the density distribution falls off as a Gaussian with a decay length on the order of the bead diameter, whereas on the liquid side, the density profile decays as a simple exponential. This result differs from that of a polymer absorbed from a good solvent with the density profile decaying as a power law. As the surface coverage increases, the average end-to-end distance and chain mobility systematically decreases toward that of the homopolymer melt.
机译:src =“http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/amlccd/2017/amlccd.2017.6.issue-11/acsmacrolett.7b00466/201815/images/medium/mz -2017-00466B_0006.GIF“>使用分子动力学模拟研究了限制在液体/蒸气界面的聚合物。 我们表明,对于对溶剂无薄的聚合物,垂直于液体/蒸气界面的密度曲线强烈不对称。 在界面的蒸汽侧,密度分布作为高斯的高斯,在珠子直径的阶数上具有衰减长度,而在液体侧,密度分布衰减为简单的指数。 该结果与来自良好溶剂吸收的聚合物的聚合物与密度剖面腐蚀作为动力法不同。 随着表面覆盖率的增加,平均端到端距离和链迁移率系统地降低了均聚物熔体的距离。

著录项

  • 来源
    《ACS Macro Letters》 |2017年第11期|共5页
  • 作者单位

    Sandia National Laboratories Albuquerque New Mexico 87185 United States;

    Sandia National Laboratories Albuquerque New Mexico 87185 United States;

    Department of Chemistry University of North Carolina Chapel Hill North Carolina 27599 United States;

    Sandia National Laboratories Albuquerque New Mexico 87185 United States;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 有机化学;
  • 关键词

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