Abstract
The coagulation reaction in the PGA fiber spun from the spinning dope of the conc. poly(sodium-L-glutamate) (PSLG) aqueous solution was studied using acid solutions as a coagulant.Solutions in most of inorganic and a few organic acids were found to be effective for the preparation of fibers and films of PGA. When the spinning dope adding a slight amount of pH-indicater (Congo Red) was extruded into the acid solution, a blue layer was formed from the surface of the filament. The diffusion rate of H+ was estimated by measuring the growth rate of the blue layer. The desolvation rate from the extruded filament was determined by measuring the changes in the degree of swelling; (the weight of coagulated gel/the weight of polymer). The results obtained were expressed as a function of the coagulation time, concentration and temperature of the HCl, H2SO4 and H3 PO4 solutions.
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