The rising curiosity in biodegradable polymers like PLLA is gaining consideration for his or her potential in next-generation biomedical units. One of many crucial challenges in leveraging PLLA’s full potential is enhancing its crystallinity, because it significantly influences mechanical, thermal, degradation, and piezoelectric properties, that are important for numerous purposes. Right here, we use thermal annealing and pressure engineering to remodel the amorphous part right into a extra ordered crystalline construction. By way of numerous characterizations, we present that crystallinity elevated progressively from 34.8% in unprocessed movies to 57.4% at 100% pressure. Terahertz Time-Area Spectroscopy is employed to achieve insights into the structural and dynamic properties the place we research low-frequency molecular vibrations and anisotropic properties, enabling simultaneous analysis of structural, akin to crystallinity, and optical traits. Rotational evaluation present direct proof of molecular orientation and birefringence induced by mechanical processing. These findings align strongly with the standard characterizations (XRD, WAXS, DSC, and FTIR). Piezoresponse Power Microscopy reveals VPFM sign elevated from 0.65 ± 0.15 pm/V in unprocessed movies to six.5 ± 1.5 pm/V at 100% pressure. The in-depth work is a vital step in gaining a deeper understanding of how the crystalline areas kind, evolve beneath totally different processing circumstances, and affect PLLA’s general properties.
