The electrospinnability of lignin was improved by blending in a solution of polyacrylonitrile (PAN) resulting in the reduction of the nanofiber cost. The compositions containing low concentration of the lignin shows good spinnability. The influences of main process parameters, such as flow rate, voltage and concentration on the nanofibers morphology were studied by scanning electron microscope (SEM). The results indicated that by changing parameters, nanofibers with good morphology were obtained. According to the study, when other parameters were kept unchanged, the parameters to prepare ideal nanofibers are as follows: flow rate is 0.04 mm/h; the voltage is 25 kV and the lignin amount is 2 wt.%. The results of this work showed that this novel method is a quite promising technique for preparation of biomass based carbon nanofiber precursors.
As a major developer of commercial nuclear energy, China saw its developments improve year by year in relevant key indicators such as the number of commercial nuclear facilities, total installed capacity and electricity generation. Accordingly, the legal system of commercial nuclear energy in China has also improved in the past four decades in three phases: Beginning (1985–2002), Growth (2003–2015) and Maturity (2016–now). The legal needs of nuclear energy development, operation, supervision and regulation has been basically met with great focuses on authorities, nuclear safety licensing, disposal of radioactive nuclear wastes and nuclear materials. However, problems still exist, including an inefficient legal system, complicated organic system and inadequate supervision on those regulatory bodies. Looking ahead, efforts should be made in three aspects for safe and healthy development in China’s commercial nuclear industry, specifically, a better relevant legal system, safety management licensing and emergency response to nuclear accidents.
Based on the requirements of physical chemistry experiment and the characteristics of applicationoriented colleges, some suggestions for the teaching reform of physical chemistry experiment were proposed, including the cooperation between theory and experiment, using the teaching mode of subgroup alternating, reforming the teaching contents and teaching method, preparing the experiments with the assistance of the internet, constructing an evaluation system. By doing so, both the teaching performance of experiment and comprehensive ability of the students were greatly improved.
In this study, lignin was characterized through elemental analysis, Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) in order to understand the potential use for future value added applications, with a major focus on composite materials. Lignins exhibited a little high sulphur. Thermogravimetric curves of the lignin demonstrated good thermal stability. Ligin/PVC composites were prepared and the effect of lignin incorporation was investigated by means of mechanical properties. Lignin added to the composite was obtained by the dual-roll milling process. The composites were prepared by molding and assessed by means of tensile testing. The results showed that no more than 15w% of lignin did not reduce tensile strength and in its presence hardness property was improved.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.