In this work, thermal and rheological properties of self-fabricated polylactic acid (PLA) filaments without and with 10-wt% polyethylene glycol (PLA/0PEG and PLA/10PEG, respectively) were investigated, and the properties were compared with a commercial PLA filament used for fused deposition modeling (FDM). The result showed that the melt flow index for self-fabricated filaments was comparable with commercial filaments at approximately 10 g/10 min at 190°C, suggesting suitability to be used as filament for FDM with well-wetted layers. Variation in thermal properties was found in PLA/10PEG with 20°C higher cold crystallization temperature (T _cc) after FDM in which disruption of the molecular arrangement reduced the ability for chain alignment and folding. The result also revealed that addition of PEG decreased the storage modulus (G′), loss modulus (G″), and complex viscosity (η*), resulting in slow crystallization behavior, and however, the properties did not induce degradation of the filaments and printing products.

在这项工作中，研究了没有和有10 wt％聚乙二醇（分别为PLA / 0PEG和PLA / 10PEG）的自制聚乳酸（PLA）细丝的热学和流变学性能，并将其与市售PLA进行了比较用于熔融沉积建模（FDM）的灯丝。结果表明，在190°C时约10 g / 10 min时，自编丝的熔体流动指数与市售丝相当，表明适合用作润湿层良好的FDM丝。在PLA / 10PEG中发现了热性质的变化，其冷结晶温度高出20°C（T _ccFDM后），其中分子排列的破坏降低了链排列和折叠的能力。结果还显示，添加PEG降低储能模量（G ^ '），损耗模量（G ^ “）和复数粘度（η *），导致慢的结晶行为，和然而，属性不诱导长丝的降解和印刷产品。