This study investigates the dyeing potential of polyester, a representative synthetic fiber, using an environmentally adaptive dry cleaning solvent, decamethylcyclopentasiloxane (D5), as a dyeing medium instead of water. The study employs an existing laboratory dyeing machine. We examined the effects of dye concentration, liquor ratio, dyeing temperature, and dyeing time on the dyeing of polyester using the solvent D5, employing three disperse dyes in red, blue, and yellow, and also assessed color fastness. The results indicated that dyeing was feasible at a dye concentration of 1.0–8.0 % owf (yellow dye: 0.2–8.0 % owf), a liquor ratio of 1:7 to 1:60 (yellow dye: 1:7 to 1:30), a dyeing temperature of 373–413 K, and a dyeing time of 5–120 minutes. The dyed materials exhibited a uniform appearance without color unevenness, and evaluations of color fastness to rubbing, light, washing, and perspiration were all rated above grade 4. This demonstrates the potential for dyeing using the solvent and disperse dyes through a simple method with an existing laboratory dyeing machine.

Although wearable devices, including electronic textiles, smart textiles, smart shoes, and smart insoles, have attracted significant attention in recent decades, supplying sufficient wireless power that is stable and continuous to these devices remains a challenge. In this study, an energy harvesting technique that enables continuous and wireless power supply of over 100 μW is demonstrated, employing a charging smartphone and conductive fabric in contact with or independent of the human body. This technique paves the way for continuous and wireless power supply to wearable devices by simply requiring that the person wearing the device hold a charging smartphone.

Discontinuous carbon fiber reinforced polypropylenes (CFRPP) have been expected to be recycling, light weight and good mechanical materials. It is known that the interfacial properties between polypropylene (PP) and carbon fiber (CF) are low. In this study, discontinuous CF reinforced PPs modified by maleic anhydride (CFRMAPPs) were made by injection molding. Tensile properties, fiber length distributions, and fiber orientation distributions of the CFRPPs were measured by multi-stage sampling and XRD methods. The tensile strength and modulus of the CFRMAPPs were higher than CF reinforced homo PP. The correlation between tensile properties and fiber length was not be observed. The correlation between tensile properties and crystallinities of PPs was not observed. The fiber orientation parameters of the CFRMAPPs were almost similar to those of CF reinforced homo PP. On the other hand, the tensile strength increased along with acid content in the PP increasing. Therefore, it was considered that the tensile strength increasing caused by the bonding between CF and PP by maleic anhydride.

This study proposes a method to enhance the recyclability of glass fiber-reinforced plastics (GFRP) by imparting dismantling ability to thermosetting adhesives through microwave irradiation. Single-walled carbon nanotubes (SWCNT) were added to epoxy adhesives at concentrations ranging from 0.2 to 1.0 wt%. The results showed that adhesive strength improved at 0.2–0.6 wt% for epoxy. Additionally, thermal decomposition and successful disassembly were observed at concentrations of ≧ 0.6 wt% for epoxy under microwave irradiation. This approach provides a promising bonding technology that enables both strong adhesion and easy disassembly, contributing to improved recyclability of FRP structures.