Bondarenko Vladislav, Hosseinnezhad Ramin, Voznyak Andrei
Physics and Mathematics Department, Kryvyi Rih State Pedagogical University, Gagarin av. 54, 50086 Kryvyi Rih, Ukraine.
Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza str., 112, 90363 Lodz, Poland.
Polymers (Basel). 2024 Aug 26;16(17):2413. doi: 10.3390/polym16172413.
In situ-generated nanofibrillar polymer-polymer composites are excellent candidates for the production of polymer materials, with high mechanical and SME properties. Their special feature is the high degree of dispersion of the in situ-generated nanofibers and the ability to form entangled nanofiber structures with high aspect ratios through an end-to-end coalescence process, which makes it possible to effectively reinforce the polymer matrix and, in many cases, increase its ductility. The substantial interfacial area, created by the in situ formed fiber/matrix morphology, significantly strengthens the interfacial interactions, which are crucial for shape fixation and shape recovery. Using the polylactide/bio-polyamide (PLA/PA) system as an example, it is shown that in situ PA fibrillation improves the mechanical and shape-memory properties of PLA. The modulus of elasticity increases by a factor of 1.4, the elongation at break increases by a factor of 30, and the shape-strain/fixity ratio and shape recovery increase from 80.2 to 97.4% and from 15.5 to 94.0%, respectively. The morphology of the minor PA phase is crucial. The best result is achieved when a physically entangled nanofibrous network is formed.
原位生成的纳米纤维聚合物-聚合物复合材料是生产聚合物材料的理想候选材料，具有高机械性能和形状记忆性能。其特点是原位生成的纳米纤维高度分散，并且能够通过端对端聚结过程形成具有高纵横比的缠结纳米纤维结构，这使得有效增强聚合物基体并在许多情况下提高其延展性成为可能。原位形成的纤维/基体形态所产生的大量界面面积显著增强了界面相互作用，这对于形状固定和形状恢复至关重要。以聚乳酸/生物聚酰胺（PLA/PA）体系为例，结果表明原位PA原纤化改善了PLA的机械性能和形状记忆性能。弹性模量提高了1.4倍，断裂伸长率提高了30倍，形状应变/固定率和形状恢复率分别从80.2%提高到97.4%，从15.5%提高到94.0%。次要PA相的形态至关重要。当形成物理缠结的纳米纤维网络时可获得最佳结果。
