Abstract
Monomer reactivity ratios in the N-carboxyanhydride (NCA) copolymerization of γ-benzyl L-glutamate with L-valine initiated by triethylamine (TEA) in a 1:1-(v/v) mixture of dioxane and dichloromethane at 25°C were determined. The methods used were a differential linearization graphical method, and a nonlinear least-square method which takes into consideration the change of monomer concentration with increasing conversion. Since the reactivity ratios are very sensitive to copolymer composition, four analytical methods have been employed to determine the copolymer composition, i.e., the amino acid analysis, elemental analysis, and ultraviolet and infrared spectroscopies. The numerical values of the monomer reactivity ratios obtained were r1(γ-benzyl L-glutamate)=2.96 and r2(L-valine)=0.17.
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