Solubility parameter-based analysis of polyacrylonitrile solutions in N,N-dimethyl formamide and dimethyl sulfoxide

摘要: Abstract The physical properties of the solutions polyacrylonitrile (PAN) in N,N -dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) were characterized terms solubility parameter. largely determined by individual parameters, particularly polar term, rather than overall With increasing temperature, intrinsic viscosity hydrodynamic diameter dilute decreased but dynamic ( η ′) concentrated was increased. Of two solvents, these phenomena more pronounced with DMF; DMF gave greater ′ yield stress DMSO. When polymer dried at 25 °C DMSO generated a cocontinuous structure whereas produced dispersed morphology. In addition, dissolved PAN faster DMSO, dissolution process followed mechanism analogous to S N 2 reaction.