Abstract
The aim of this work was to study the effect of ceramics particles addition (SiO2, ZnO, TiO2) on the ultraviolet (UV) aging of poly(lactic acid) nonwovens fabricated using electrospinning method. The resistance to aging is a key factor for outdoor and medical applications (UV light sterilization). Nonwovens were placed in special chamber with UV light. Changes of physicochemical properties were recorded using differential scanning calorimetry and attenuated total reflection Fourier-transform infrared spectroscopy. The fibers’ morphology was studied by using scanning electron microscopy. Obtained results clearly showed that only PLA fibers with ZnO particles gained an increase in UV resistance. The paper presents a description of structural changes taking place under the influence of UV aging processes and describes the mechanisms of this process and the effect of ceramic addition on the lifetime of such materials.
Highlights
Biodegradable and bio-based polymers have recently drawn more and more attention in several applications, including composites [1,2,3], packaging [4] and medicine [5]
Based on the SEM images, the following parameters were selected to obtain fibers modified with ceramic particles: concentrations of Poly(lactic acid) (PLA)—13%, gap between tip of needle and collector—5 cm, ratio of DCM and DMF—2.5 to 1
The nanocomposite fibers based on poly(lactic acid) were produced successfully by an electrospinning method
Summary
Biodegradable and bio-based polymers have recently drawn more and more attention in several applications, including composites [1,2,3], packaging [4] and medicine [5]. Poly(lactic acid) (PLA), linear polyester, is extensively tested in medicine and tissue engineering, due to its biodegradability, non-toxicity and biocompatibility [7, 8]. Its mechanical properties are similar to commonly used synthetic polymers. Physicochemical properties of PLA depend on a stereoisomeric form of polymer [9]. Lactic acid (LAc), a repetitive unit of PLA, consists of two optical isomers: D(−)LAc and L(+)LAc. Homochiral PLA is a semicrystalline, isotactic polymer (PLLA and PDLA). Polymerization of D- and L-LAc mixture leads to the formation of heterochiral, atactic PLDLA with amorphous properties
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