Study on Thin Lamination of Carbon Fiber Based on Mechanical Broadening.

Carbon fiber has excellent mechanical properties and plays an important role in modern industry. However, due to the complexity of the carbon fiber widening process, the industrial application of carbon fiber is limited. By designing the carbon fiber widening equipment of automaton, the relationship between the widening width of carbon fiber and the process parameters is studied, and the optimum developing process parameters are obtained, to improve the performance of carbon fiber composites to a certain extent. In this study, the widening process of carbon fiber was studied based on the mechanical broadening method. Firstly, an automatic broadening equipment was designed, and the effects of the initial tension, the number of straight rods, the number of convex rods, and the drawing speed on the widened width during the broadening process were discussed. The widening effect was evaluated by SEM imaging and mechanical testing. At the same time, the factors affecting the broadening width and broadening defects during the broadening process were analyzed, and the optimal broadening process parameters were obtained. The results showed that within a specific range, a higher initial tension, a greater number of convex rods, and an appropriate speed resulted in relatively smaller damage to the broadening of carbon fibers. Through the design of automatic broadening, this experiment explores optimal broadening process parameters, provides a reference for the improvement of the carbon fiber broadening process and further promotes large-scale industrial applications of carbon fiber.

Tuning the fluorescence of tetraphenylethylene in dilute solutions via modulating multiple-hydrogen-bonding interactions between a Hamilton receptor and cyanuric acid.

Four Hamilton receptors and four cyanuric acid modules were introduced into the tetraphenylethylene skeleton to form HTPE and CTPE, respectively. Upon 1 : 1 mixing of HTPE and CTPE in apolar dilute solution, a self-assembled supramolecular network was formed via multiple intermolecular hydrogen bonding interactions. The intramolecular rotation of phenyls in TPE skeletons was restricted, and thus the system became highly luminescent. Upon the addition of a hydrogen bonding competitive solvent to destroy the network, the fluorescence emission was substantially quenched. Besides, the fluorescence of the system could be further tuned by the addition of Cu2+ and other metal ions.