The prevalent way to enhance interface interaction of immiscible polymer blend is adding some low molecular weight compatibilizers with “soft” nature, unfortunately throwing negative effects on the final mechanical strength. Here, an interfacial interlocking design strategy for immiscible polypropylene (PP)/polyamide (PA) blend is proposed. The formation process involves aryl amide-based compounds firstly were selectively enriched in PA phase, followed by controlled release and recrystallization at the subsequent annealing process, into fiber-like crystals at the interface. Accordingly, the blend featuring mechanical interlocking was successfully prepared, where the interfacial grown fibers functioned as interlocks to integrate the two immiscible components via large interfacial friction. Furthermore, the density and dimension of the interfacial fibers were tailored by adjusting the annealing temperatures. Specially, at the elevated temperature, the large and dense fibers were generated at the interface to offer stronger interfacial friction, which in turn strengthened the interfacial interaction. The interfacial topological regulation can effectively solve the interfacial problems and also can extend broadly to the other immiscible bi-phase systems.

增强不混溶聚合物共混物界面相互作用的普遍方法是添加一些具有“软”性质的低分子量增容剂，不幸的是对最终的机械强度产生负面影响。在此，提出了一种互溶聚丙烯（PP）/聚酰胺（PA）共混物的界面互锁设计策略。形成过程涉及首先将芳基酰胺基化合物选择性地富集在PA相中，然后在随后的退火过程中进行控制释放和重结晶，在界面处形成纤维状晶体。因此，成功制备了具有机械互锁的共混物，其中界面生长的纤维起互锁作用，通过大的界面摩擦作用将两种不混溶的组分结合在一起。此外，通过调节退火温度来调整界面纤维的密度和尺寸。特别地，在升高的温度下，在界面处会产生大而致密的纤维，以提供更强的界面摩擦力，从而增强了界面相互作用。界面拓扑规则可以有效地解决界面问题，并且可以广泛地扩展到其他不混溶的两相系统。