己二酸
增容
差示扫描量热法
扩展器
材料科学
复合材料
扫描电子显微镜
流变学
聚合物混合物
极限抗拉强度
艾氏冲击强度试验
聚合物
共聚物
聚氨酯
热力学
物理
作者
Jacek Andrzejewski,Joyce Cheng,Andrew Anstey,Manjusri Misra
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2020-01-02
卷期号:8 (17): 6576-6589
被引量:58
标识
DOI:10.1021/acssuschemeng.9b04925
摘要
The research presented in this article discusses the subject of poly(lactic acid) (PLA) modification via reactive mixing with the poly(butylene adipate-co-terephthalate) (PBAT) copolymer for 3D printing applications. Filaments suitable for fused deposition modeling were prepared from blends of PLA containing 10, 20, and 30% by weight of PBAT. Mechanical testing clearly indicated that the blending with PBAT effectively increases the impact strength of PLA, from an initial value of approximately 30 J/m to more than 700 J/m for the optimized PLA/PBAT (30%) chain extender-modified blend. The addition of the multifunctional chain extender (ESA) also has a positive effect on the rheological profile of the PLA/PBAT materials, which facilitates both the production process of the extruded filament and the maintenance of a stable width of the printed material path. Despite the use of a significant PBAT content, the analysis of thermomechanical properties did not show any significant deterioration in the thermal resistance of the materials, while a detailed differential scanning calorimetry analysis indicates a small tendency to nucleate the PLA structure by PBAT inclusions. The structural analysis of scanning electron microscopy clearly indicates a change in the mechanism of deformation from a brittle fracture for pure PLA to a more favorable shear yielding for PBAT-rich blends. The comparison of the properties of printed and injected PLA/PBAT blends indicates the possibility of obtaining similar or in some respects better mechanical properties, especially for ESA-modified samples.
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