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A novel viscosity-modifier (hydrazine monochloride, HMC) gradually reduces the viscosity of PVA aqueous solution over a period of several days. This phenomenon is counter to the usual effect of ionic salt addition. After being stored for several days, the viscosity decreased by up to 60 % compared to that of an equivalent pure PVA solution. Using HMC to control the viscosity of the PVA solution made it possible to fabricate ultrafine electrospun fibers. 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