Crooks G E, Ostrovsky B, Bar-Yam Y
Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 1999 Oct;60(4 Pt B):4559-63. doi: 10.1103/physreve.60.4559.
We investigate the internal structure of a polymer during collapse from an expanded coil to a compact globule. Collapse is more probable in local regions of high curvature, so a smoothing of the fractal polymer structure occurs that proceeds systematically from the shortest to the longest length scales. A proposed universal scaling relationship is tested by comparison with Monte Carlo simulations. We speculate that the universal form applies to various fractal systems with local processes that promote smoothness over time. The results complement earlier work showing that on the macroscale polymer collapse proceeds by driven diffusion of the polymer ends.
我们研究了聚合物从伸展的线团塌缩为紧密球状体过程中的内部结构。在高曲率的局部区域更有可能发生塌缩，因此分形聚合物结构会发生平滑化，这种平滑化从最短到最长的长度尺度有系统地进行。通过与蒙特卡罗模拟进行比较，对一个提出的通用标度关系进行了检验。我们推测这种通用形式适用于各种具有随时间促进平滑化的局部过程的分形系统。这些结果补充了早期的研究工作，早期研究表明在宏观尺度上聚合物塌缩是通过聚合物末端的驱动扩散进行的。
