Abstract An in situ-profiled microfibril-reinforced composite of modified polyamide 66 (mPA66) with polypropylene (PP) was prepared using a non-conventional compatibilization technique. The scanning electron microscope morphological observations showed in situ-generated, profiled microfibrils with a non-uniform diameter distribution and very rough surfaces with many pits and knots. The pits and knots were confirmed by the compatibilizer diffusion determined by the energy dispersive spectrum analysis. The presence of the PA66-profiled microfibrils shows the significant nucleation ability of the PP crystallization. Differential scanning calorimetry observations illustrated that the profiled microfibrils can accelerate the crystallization rate and increase the crystallization temperature. Obvious transcrystallization layers were observed through a polarized optical microscope. The β-crystalline phase of PP and larger, long period lamellar stacks were identified by small and wide-angle X-ray scattering measurements, respectively. These observations were very different from those of the simply blended samples of PP/PA66 in the presence or absence of the compatibilizer. Thus, the profiled microfibrils and improved interface adhesion may account for the powerful influence of PP on the crystallization and crystal structure.

中文翻译：

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聚丙烯在改性 PA66 与 PP 的原位微纤维复合材料中的结晶、形态和晶体结构

摘要 使用非常规增容技术制备了改性聚酰胺 66 (mPA66) 与聚丙烯 (PP) 的原位异形微纤维增强复合材料。扫描电子显微镜形态观察显示原位生成的异形微纤维具有不均匀的直径分布和非常粗糙的表面，有许多凹坑和结。通过能量色散谱分析确定的增容剂扩散证实了凹坑和结节。PA66 异型微纤维的存在表明 PP 结晶具有显着的成核能力。差示扫描量热法观察表明，异形微纤维可以加快结晶速度并提高结晶温度。通过偏光显微镜观察到明显的晶化层。PP 的 β 晶相和较大的长周期层状堆叠分别通过小和广角 X 射线散射测量来识别。这些观察结果与存在或不存在增容剂的 PP/PA66 简单混合样品的观察结果非常不同。因此，异形微纤维和改进的界面粘附可能解释了 PP 对结晶和晶体结构的强大影响。这些观察结果与存在或不存在增容剂的 PP/PA66 简单混合样品的观察结果非常不同。因此，异形微纤维和改进的界面粘附可能解释了 PP 对结晶和晶体结构的强大影响。这些观察结果与存在或不存在增容剂的 PP/PA66 简单混合样品的观察结果非常不同。因此，异形微纤维和改进的界面粘附可能解释了 PP 对结晶和晶体结构的强大影响。