We report a microscopic observation of the time-dependent dynamic tube dilation process on isofrictional bidisperse melts. By applying neutron spin echo (NSE) and dielectric techniques on blends of long polyisoprene (PI) chains with short PI additives with different topology, we access the dynamics of the tube dilation process on a molecular scale. The time-dependent tube dilation is directly revealed by NSE as an additional time dependence of the dynamic structure factor in the local reptation regime. We identify the characteristic time of tube dilation as the terminal time of the additive.

中文翻译：

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纠缠的聚合物共混物中动态管膨胀的直接观察：中子散射和介电技术的结合

我们报告了等时双分散熔体随时间变化的动态管扩张过程的微观观察。通过将中子自旋回波（NSE）和介电技术应用于具有不同拓扑结构的长聚异戊二烯（PI）链与短PI添加剂的共混物，我们可以在分子尺度上获得管扩张过程的动力学。NSE直接揭示了时间依赖性管扩张，这是局部复制机制中动态结构因子的其他时间依赖性。我们将电子管膨胀的特征时间确定为添加剂的终止时间。