Kinetic aspects of the coil-stretch transition of polymer chains in dilute solution under extensional flow
Kinetic aspects of the coil-stretch transition of polymer chains in dilute solution under extensional flow
复制标题
稀溶液中拉伸流动下聚合物链卷曲-拉伸转变的动力学方面
DOI：
10.1063/1.1410379
复制
发表时间：
2001
影响因子：
4.4
通讯作者：
J. Torre
中科院分区：
文献类型：
--
作者：
J. H. Cifre;J. Torre
当稀溶液中的线性聚合物链受到拉伸流动时，样品中的每个链在不同的时间经历卷曲-拉伸转变。利用布朗动力学模拟，研究了跃迁时间随伸长率和链长的变化规律。如果用累积应变来表征流动的影响而不是时间，那么分布及其力矩似乎具有一般的形式，与分子量和流速无关，包含从动态模拟中评估的一些数值的、通用的常数。还模拟了以剩余线圈分数随时间变化表示的转变动力学，并以与转变时间相似的方式对动力学速率常数的结果进行了合理化。分子个人主义，在这项工作中的特点是转变时间的分布，是与应用的伸展的过量有关的。
When linear polymer chains in dilute solution are subject to extensional flow, each chain in the sample experiences the coil-stretch transition at a different time. Using Brownian dynamics simulation, we have studied the distribution of transition times in terms of the extensional rate and the length of the chains. If instead of time one characterizes the effect of the flow by the accumulated strain, then the distribution and its moments seem to take general forms, independent of molecular weight and flow rate, containing some numerical, universal constants that have been evaluated from the dynamical simulation. The kinetics of the transition, expressed by the time-dependence of the fraction of remaining coils, has also been simulated, and the results for the kinetic rate constant has been rationalized in a manner similar to that used for the transition time. The molecular individualism, characterized in this work by the distribution of transition times, is related to the excess of the applied extensional...
影响因子：
56.9
作者：
Perkins, TT;Smith, DE;Chu, S
通讯作者：
Chu, S