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Melt electrospinning is an even simpler and safer method compared with the  solution electrospinning in the production of ultra-fine fibers. Polylactic  acid (PLA) is a biodegradable and resorbable aliphatic ester that has  received significant attention in recent years. PLA is easily degradable at  high temperature in the process of melt electrospinning. High efficient  fibers were made using our designed umbrella-like spray head spinning  facility in this work. To find how to alleviate the problematic degradation  and what factors could be relevant to degradation, temperature, relative  molecular mass, Differential Scanning Calorimeter and X-ray Diffraction  patterns before and after spinning were investigated and compared with each  other. Results showed that fibers were facile shorten and fractured when spun  at 245°C while the relative molecular mass of PLA fibers decreased markedly  as compared with that spun at 210°C. To hinder the degradation, couple of  experimental efforts were implemented with adding antioxidants, raising  spinning voltage, lowering temperature, and reducing residence time. After  such efforts, it was observed that the relative molecular mass of the PLA  fibers was higher than those without inputting any efforts. The effect of  antioxidant 1010 was found the most promising on the alleviation of PLA  problematic thermal degradation

journal of the serbian chemical society

Solvent-free preparation of polylactic acid fibers by melt electrospinning using umbrella-like spray head and alleviation of problematic thermal degradation