Wang Sisi, Daelemans Lode, Fiorio Rudinei, Gou Maling, D'hooge Dagmar R, De Clerck Karen, Cardon Ludwig
Centre for Polymer and Material Technologies (CPMT), Department of Materials, Textiles and Chemical Engineering, Ghent University, 9052 Zwijnaarde, Belgium.
Centre for Textiles Science and Engineering (CTSE), Department of Materials, Textiles and Chemical Engineering, Ghent University, 9052 Zwijnaarde, Belgium.
Polymers (Basel). 2019 Sep 19;11(9):1529. doi: 10.3390/polym11091529.
Based on differential scanning calorimetry (DSC), X-ray diffraction (XRD) analysis, polarizing microscope (POM), and scanning electron microscopy (SEM) analysis, strategies to close the gap on applying conventional processing optimizations for the field of 3D printing and to specifically increase the mechanical performance of extrusion-based additive manufacturing of poly(lactic acid) (PLA) filaments by annealing and/or blending with poly(3-hydroxybutyrate) (PHB) were reported. For filament printing at 210 °C, the PLA crystallinity increased significantly upon annealing. Specifically, for 2 h of annealing at 100 °C, the fracture surface became sufficiently coarse such that the PLA notched impact strength increased significantly (15 kJ m). The Vicat softening temperature (VST) increased to 160 °C, starting from an annealing time of 0.5 h. Similar increases in VST were obtained by blending with PHB (20 wt.%) at a lower printing temperature of 190 °C due to crystallization control. For the blend, the strain at break increased due to the presence of a second phase, with annealing only relevant for enhancing the modulus.
基于差示扫描量热法（DSC）、X射线衍射（XRD）分析、偏光显微镜（POM）和扫描电子显微镜（SEM）分析，报告了一些策略，以弥合在3D打印领域应用传统加工优化方面的差距，并通过退火和/或与聚（3-羟基丁酸酯）（PHB）共混来特别提高聚乳酸（PLA）长丝挤出基增材制造的机械性能。对于在210°C下进行长丝打印，退火后PLA的结晶度显著提高。具体而言，在100°C下退火2小时后，断裂表面变得足够粗糙，使得PLA缺口冲击强度显著提高（15 kJ/m）。从0.5小时的退火时间开始，维卡软化温度（VST）升至160°C。由于结晶控制，在较低的190°C打印温度下与PHB（20 wt.%）共混也获得了类似的VST升高。对于共混物，由于第二相的存在，断裂应变增加，退火仅与提高模量相关。
