![]() These include wet-spinning, electrospinning, melt-spinning, film-drawing, and the incorporation of fibre composites 6, 7, 8, 9, 10, 11. Various approaches have been used to produce polymer-based fibrous sensors. As a person moves, the motion causes the piezoelectric fibrous sensor to stretch, twist, bend, or shear this mechanical deformation is converted into an electrical signal that can be used to monitor human physiological conditions. Fibrous piezoelectric sensors can be incorporated into clothing and accessories, such as watches, eyeglasses, and bracelets, or even mounted directly on the body 1, 2, 3, 4, 5. Owing to their stretchability, flexibility, and easy fabrication, fibrous piezoelectric materials have attracted a great deal of attention for the manufacture of wearable electronic devices that can detect motion as well as physiological and behavioural signals. The results indicated that PLLA/BaTiO 3 fibres could be a one of the material for organic-based piezoelectric sensors for application in textile-based wearable piezoelectric devices. From these results, we confirmed that the crystalline phase transition of PLLA/BaTiO 3 fibres was significantly enhanced under the optimised post-processing conditions at a draw ratio of 3 and temperature of 120 ☌ during the melt-spinning process. The piezoelectric properties of PLLA/BaTiO 3 fibres were characterised in their yarn and textile form through a tapping method. The α → β phase transition behaviour was determined by two-dimensional wide-angle x-ray diffraction and differential scanning calorimetry. ![]() To improve the piezoelectric properties of melt-spun poly( l-lactic acid) (PLLA)/BaTiO 3, we optimized the post-processing conditions to increase the proportion of the β crystalline phase. Poly( l-lactic acid) (PLLA) based piezoelectric polymers are gradually becoming the substitute for the conventional piezoelectric ceramic and polymeric materials due to their low cost and biodegradable, non-toxic, piezoelectric and non-pyroelectric nature.
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