Abstract:
These polyphenylene sulfide fibers are characterized in that the fibers contain 1-10wt% of a polyphenylene sulfide oligomer having a weight average molecular weight of at most 5,000, in that during the DSC heating process the difference (ΔHm-ΔHc) between the cold crystallization heat (ΔHc) and the crystalline melting heat (ΔHm) is at least 25J/g, and in that the elongation is less than 40% and the strength is at least 3.0cN/dtex. The polyphenylene sulfide fibers have high heat resistance and chemical resistance, as well as high strength, while providing high order workability, such as thermoforming properties, because of the high molecular mobility of the amorphous part thereof.
Abstract:
This nonwoven fabric is a spunbonded nonwoven fabric composed of monocomponent fibers comprising a copolyester resin derived by copolymerizing a polyester resin with 5-40 wt.% polyethylene glycol, characterized in that the ΔMR of the spunbonded nonwoven fabric is 0.5% to 15% inclusive.
Abstract:
Provided is a polyphenylene sulfide fiber for which changes in fiber structure are small and which has excellent long-term heat resistance. That is, the present invention is a polyphenylene sulfide fiber characterized in that the degree of crystallinity is at least 45.0%, the amount of mobile amorphous phases is not more than 15.0%, and the weight average molecular weight is not more than 300,000.
Abstract:
These polyphenylene sulfide fibers are characterized in that the fibers contain 1-10wt% of a polyphenylene sulfide oligomer having a weight average molecular weight of at most 5,000, in that during the DSC heating process the difference (ΔHm-ΔHc) between the cold crystallization heat (ΔHc) and the crystalline melting heat (ΔHm) is at least 25J/g, and in that the elongation is less than 40% and the strength is at least 3.0cN/dtex. The polyphenylene sulfide fibers have high heat resistance and chemical resistance, as well as high strength, while providing high order workability, such as thermoforming properties, because of the high molecular mobility of the amorphous part thereof.
Abstract:
The purpose of the present invention is to provide a composite electrolyte membrane which has excellent chemical resistance and can maintain sufficient mechanical strength even under conditions of high humidity and high pressure, which are the operating conditions for electrochemical hydrogen pumps and water electrolyzers. This composite electrolyte membrane, which is for achieving said purpose, has a composite layer obtained by combining a polyelectrolyte with a mesh woven material that satisfies (1) and (2) and comprises liquid crystal polyester fibers or polyphenylene sulfide fibers. (1): Mesh thickness (µm)/fiber diameter (µm)? ?1Ø
Abstract:
Provided is a polyphenylene sulfide fiber for which changes in fiber structure are small and which has excellent long-term heat resistance. That is, the present invention is a polyphenylene sulfide fiber characterized in that the degree of crystallinity is at least 45.0%, the amount of mobile amorphous phases is not more than 15.0%, and the weight average molecular weight is not more than 300,000.
Abstract:
Disclosed is a sea-island composite fiber in which the island component is ultrafine fibers having a noncircular cross-section, the ultrafine fibers being uniform in the degree of non-circularity and in the diameter of the circumscribed circle. The sea-island composite fiber comprises an easily soluble polymer as the sea component and a sparingly soluble polymer as the island component, and is characterized in that the island component has a circumscribed-circle diameter in the range of 10-1,000 nm, a dispersion in circumscribed-circle diameter of 1-20%, a degree of non-circularity of 1.2-5.0, and a dispersion in the degree of non-circularity of 1-10%.