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The monodisperse dual temperature/pH-sensitive nanoparticles are prepared by distillation-precipitation polymerization, which use the acrylic acid (AA) and N-Isopropyl acrylamide (NIPAM) as the monomer materials and divinyl benzene (DVB) as the crosslinking agent. The nanoparticles with excellent stability shows good pH responsiveness and temperature sensitivity that can shrink freely in response to acidic environmental stimuli. The monodisperse nanoparticles may thus be very promising for use in many applications in which rapid responses to dual environmental stimuli are required. [ABSTRACT FROM PUBLISHER]

The novel functionality of aromatic tetrazole derivatives with high nitrogen content predetermines a great interest totetrazole-cntaining polymer. The dependency of tetrazole content, intrinsic viscosity properties of the polyacrylonitrile- poly(5-vinyltetrazole) (PAN-PVT) was studied by FT-IR and UV-Vis spectroscopies, and PAN-PVT exhibits munch higher intrinsic viscosity than original polyacrylonitrile. The PAN-PVT hollow-fiber ultrafiltration membranes were prepared by using the dry-wet spinning method. Cross-section, internal, and external surfaces of the hollow fibers structure were studied by SEM. [ABSTRACT FROM PUBLISHER]