Abstract
The polymer complex fibers of poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA) were produced by inhibiting the complexation to obtain spinnable fluid and initiating the complexation in coagulation bath to make fiber formation. With sulfonic acid as coagulation solution, PVA/PAA fiber can be cross-linked at mild temperature while with hydrochloric acid as coagulation solution is not. The mechanical properties of PVA/PAA fibers strongly depend on environment humidity. As the humidity increases, the fibers show a transition from a glassy state to a rubbery state. Furthermore, dynamic mechanical analysis (DMA) with humidity scans detects not only glass-rubber transition of the cross-linked PVA/PAA fiber but also the secondary relaxation, which reflects molecular motions at the difference scales in the fiber.
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