Takeshi Ishikawa

Recycling of carbon-fiber-reinforced polypropylene prepreg waste based on pelletization process

This research proposes a technique to recycle carbon-fiber-reinforced polypropylene thermoplastics based on a pelletization process followed by injection molding. Experiments were designed with different process conditions to evaluate the efficient performance of the recyclates. In this study, the properties of the recyclates with various fiber contents were compared with those of conventional virgin products. The study confirmed that the recycled composite is as usable for injection molding as virgin conventional materials in terms of flowability and mechanical properties. The recycled composite is suggested to have better interfacial adhesion between the fiber and the resin than conventional materials because of the good impregnation of the carbon fibers in the carbon-fiber-reinforced-thermoplastic waste. In conclusion, the recycling of carbon-fiber-reinforced-thermoplastic prepreg waste using the proposed method is simple, effective and it would be economical.

Bubble points of hydrogen chloride–water–isopropanol and hydrogen chloride–water–isopropanol–benzene systems and liquid–liquid equilibria of hydrogen chloride–water–benzene and hydrogen chloride–water–isopropanol–benzene systems

Abstract Bubble points of the HCl–water–isopropanol and the HCl–water–isopropanol–benzene systems and liquid–liquid equilibria (LLE) of the HCl–water–benzene and the HCl–water– isopropanol–benzene systems were measured at 25–85°C and 30–70°C, respectively. The electrolyte nonrandom two-liquid model proposed by Chen et al. [C.-C. Chen, H.I. Britt, J.F. Boston, L.B. Evans, AIChE J. 28 (1982) 588–596] can satisfactorily correlate bubble points and liquid–liquid equilibria of the present mixed-solvent electrolyte systems over the entire range of temperature and concentrations using only binary adjustable parameters.