Science. 1990 Nov 2;250(4981):640-6. doi: 10.1126/science.250.4981.640.
In contrast to interdiffusion in simple liquids, interdiffusion of polymeric chains is dominated by their intertanglement and their large size. These properties profoundly reduce both the molecular mobilities and the role of entropy in driving the mixing. The resulting diffusional processes have only recently been studied. Such studies reveal a wide spectrum of behavior ranging from accelerated interdiffusion (for strongly compatible chains) to its suppression below the critical point for phase separation. Effects that are still poorly understood include the initial disposition at interfaces of the chains' ends (through which diffusion proceeds by reptation) and the need for cooperative motion, which can strongly magnify local friction.
与简单液体中的互扩散相反，聚合物链的互扩散主要受其缠结和较大尺寸的支配。这些特性极大地降低了分子迁移率和熵在驱动混合过程中的作用。最近才对这些扩散过程进行了研究。这些研究揭示了从加速互扩散（对于强相容链）到低于相分离临界点的扩散抑制的广泛行为范围。仍然不太理解的影响包括链端在界面处的初始分布（通过蠕动扩散进行）以及需要协同运动，这会强烈放大局部摩擦。
