RHEOLOGICAL BEHAVIOR OF POLYACRYLONITRILE COPOLYMERS PLASTICIZED WITH WATER

摘要

The presence of water can dramatically lower the melting point of polyacrylonitrile (PAN) homo- or copolymers and make it possible to melt-spin high acrylonitrile (AN) content PAN fibers. However, the behavior of PAN-water melt has not been adequately investigated and the rheology data for PAN-water melt is not available in literature. We developed pressurized capillary rheometer and used it in PAN/Vinyl Acetate (VA)-H_2O viscosity measurement successfully. The shear viscosity at 195°C decreases as water content increases from 17 wt-% to 23 wt-%. The rheology of PAN-water melt can be useful in characterizing the melt and spinning PAN precursor fibers.