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Fabrication of Polypropylene Nanofibers from Polypropylene/Polyvinyl Butyral Blend Films Using Laser‐Assisted Melt‐Electrospinning
摘要： Polypropylene (PP) nano?bers, a few hundred nanometers in diameter, are of immense importance in the ?ber industry. This article reports the fabrication of delicate PP nano?bers. Polyvinyl butyral (PVB) was added to PP as a blend component, and a nozzle-free melt-electrospinning system with a line-like CO2 laser melting device was used to manufacture PP nano?bers. We investigated the effect of PVB ratio on ?ber diameter. The addition of PVB was found to be potentially very bene?cial in PP/PVB blends, resulting in improved PP crystallinity and a steady decrease of ?ber diameter with high productivity. The reduction of ?ber diameter was attributed to the decline of viscosity, increase of surface adhesion properties, and polarity of blends due to the inclusion of PVB. To produce PP nano?ber, the PVB was removed from PP/PVB blend ?bers with an ethanol treatment. A drastic drop of PP ?ber diameter followed by ?ber splitting was observed after PVB removal. We obtained PP nano?bers with a diameter as low as 181 (cid:1) 105 nm from the blend ?ber with 90% PVB. Infrared spectroscopy of ?bers demonstrated that PP ?bers from pure polymer and blends showed the same characteristic peaks.
关键词： Polyvinyl butyral,ethanol treatment,Polypropylene,melt-electrospinning,CO2 laser,nano?bers
更新于2025-09-12 10:27:22
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Comparative evaluation of novel thermo-chemical treatment methods for improved impact performance of laminated glass
摘要： The thermal and chemical treatment used for glass is not applicable for the laminated glass due to the presence of interlayer having lower melting temperature than the minimum required temperature for the conventional treatment of glass. The present work reports four specialized treatment methods for laminated glass treatment. The effectiveness of the four novel laminated glass treatment methods is evaluated for an impact response of laminated glass. The destructive ball drop testing was performed following EN 356 on laminated glass samples after treating them with each of the four treatment methods. The treatment methods are compared based on the fracture pattern (correlated to the post-fracture response), fragment size, and amount of damage due to the impact by 2.3 kg, 83 mm diameter smooth solid steel ball from the height of 5 m. A multi-purpose algorithm (transient analysis in ANSYS 14.5 (explicit dynamics module)) was utilized for the determination of the maximum deformation and maximum equivalent stress. The regression analysis is conducted for the validation of experimental results. The impact behavior of thermo-chemically treated laminated glass samples was found to be significantly better than the untreated laminated glass samples in the most cases as the impurities/defects were reduced and strength of the laminated glass samples was increased by the treatment. These treatment methods can be customized later for the laminated glass structures and windshields during operating conditions, which would be a significant contribution to this field.
关键词： polyvinyl butyral,finite element method,laminated glass,Impact strength,thermo-chemical treatment
更新于2025-09-09 09:28:46