In Situ Time-Resolved X-ray Scattering Study of Isotactic Polypropylene in Additive Manufacturing

作者：Yuval Shmueli, Yu‐Chung Lin, Sungsik Lee, Mikhail Zhernenkov, Rina Tannenbaum, G. Marom, Miriam Rafailovich · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.9b12908 · 被引用次数：54 · 研究领域：Additive Manufacturing and 3D Printing Technologies、Polymer crystallization and properties、Injection Molding Process and Properties

Using a specially designed apparatus, which collects simultaneous temperature and X-ray scattering data, we performed in situ measurements of the filament during MatEx 3D printing. The data show that the MatEx 3D printing extrusion process provides sufficient shear to form shish-kebab structures, which initially nucleate at the filament surface and spread into the filament core. Time-resolved measurements show that the kebab component near the surface relaxes after deposition of the second filament and enhances chain diffusion across the interface. SEM images indicate near complete interfacial merging of the filaments, which results in excellent mechanical properties.