Control of molecular weight distribution in polycondensation polymers. Polyamide synthesis

Abstract

Synthesis of the aromatic polyamide with a narrow molecular weight distribution (Mw/Mn) was investigated via polycondensation. The new monomers, metal amide anions of 4-(N-octylamino)benzoylbenzoxazolin-2-thione (2) was prepared to prevent conventional polycondensation. The number average molecular weights (Mn)s of the resulting polymer could be controlled varying the feed ratio of 2 and p-nitrobenzoyl chloride in the range of 103-104 maintaining narrow Mw/Mns (∼ 1.15). The kinetic plots of the polymerization gave a linear relationship between polymerization time and -(1/[I]0) ln([M]/[M]0), and the rate of the polymerization was estimated as 116.4 mol-1 h-1.