Preparation of thermochromic bioplastic composite filaments for 3D printing process

This research aimed to produce thermochromic composite filaments by utilizing poly(lactic acid) (PLA) as a matrix and two distinct thermochromic additives (red and yellow colors). To produce thermochromic composite filaments with ratios ranging from 10 to 40 phr, different quantities of a thermochromic masterbatch were integrated into the PLA matrix through an extrusion process. The physical, mechanical, thermal properties, and thermochromic behavior of the composite filaments were further examined. The results indicated that the thermochromic additives had minimal impact on thermal and mechanical properties, while also revealing a two-phase separation between the smooth matrix and the spherical particle additives in the thermochromic composite filaments. Moreover, the analysis of thermochromic behavior revealed that an increase in the ratio of thermochromic masterbatches led to more pronounced coloration and clearer color changes, especially with red and yellow thermochromics indicating temperature variations below 22degree celsius and over 65degree celsius, respectively. The sample containing 40 phr exhibited the most intense color and noticeable color change. Furthermore, these thermochromic composite filaments can be utilized to 3D print various prototype products.

Automated summary

This study aimed to produce thermochromic composite filaments using poly(lactic acid) (PLA) as a matrix and two different thermochromic additives (red and yellow). By integrating different quantities of a thermochromic masterbatch into the PLA matrix through an extrusion process, thermochromic composite filaments with ratios ranging from 10 to 40 phr were produced. The physical, mechanical, thermal properties, and thermochromic behavior of the composite filaments were examined. The results showed that the thermochromic additives had minimal impact on thermal and mechanical properties, while revealing a two-phase separation between the matrix and the additives. Moreover, an increase in the ratio of thermochromic masterbatches led to more pronounced coloration and clearer color changes. The sample with 40 phr exhibited the most intense color and noticeable color change. Additionally, these thermochromic composite filaments can be used for 3D printing various prototype products.