Kaczor Daniel, Bajer Krzysztof, Raszkowska-Kaczor Aneta, Domek Grzegorz, Madajski Piotr, Szroeder Pawel
Łukasiewicz Research Network-Institute for Engineering of Polymer Materials and Dyes, Marii Skłodowskiej-Curie 55, 87-100 Toruń, Poland.
Faculty of Mechatronics, Kazimierz Wielki University, Kopernika 1, 85-074 Bydgoszcz, Poland.
Materials (Basel). 2022 Dec 15;15(24):8958. doi: 10.3390/ma15248958.
High filled polylactide/multiwall carbon nanotube composites were subjected to multiple extrusions using single-screw and twin-screw extruders. Samples of the processed composites were characterized by SEM, XRD, Raman, and FTIR spectroscopy. Thermal and rheological properties were investigated by DSC and MFR analyses. Subsequent extrusions resulted in decreased torque and process efficiency, which is a consequence of the viscosity reduction of PLA. Thermal and rheological properties of composites changed after each extrusion as well. As revealed by DSC analyses, cold crystallization temperature showed a tendency to decrease after each process, whereas cold crystallization enthalpy ΔHcc increased significantly. Melt flow rate, which is indicative of the polymer degradation, increased after each extrusion.
高填充聚乳酸/多壁碳纳米管复合材料使用单螺杆和双螺杆挤出机进行多次挤出。对加工后的复合材料样品进行扫描电子显微镜（SEM）、X射线衍射（XRD）、拉曼光谱和傅里叶变换红外光谱（FTIR）表征。通过差示扫描量热法（DSC）和熔体流动速率（MFR）分析研究热性能和流变性能。后续挤出导致扭矩和加工效率降低，这是聚乳酸粘度降低的结果。每次挤出后复合材料的热性能和流变性能也会发生变化。DSC分析表明，每次加工后冷结晶温度呈下降趋势，而冷结晶焓ΔHcc显著增加。表明聚合物降解的熔体流动速率在每次挤出后都会增加。
