Effect of Molecular Weight Distribution on the Crystallinity and Monolayer Morphology of N-alkylated Poly(p-benzamides)

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We synthesized new aromatic polyamides (poly-(N-alkylated benzamides), abbrev. PABAn) having both a rigid main chain and a flexible side chain with different lengths. We investigated the solid-state structures, that is, the molecular orientation and surface morphology, of organized molecular films of PABAn by performing surface pressure-area (π-A) isotherm, and atomic force microscopy (AFM) measurements. The solid-state structure of poly-(N-methyl benzamide) (PABA1) belonged to the monoclinic system, whereas PABA3, PABA4, and PABA5 showed an orthorhombic packing pattern. PABA7 and PABA8 formed amorphous polymers. In the case of PABA17, a two-dimensional hexagonal lattice was formed as a subcell consisting of side chains. These polymer monolayers were highly condensed on a water surface at 15 °C. At the air/water interface, changes in "particulation" behavior are confirmed in the system of PABA3 controlled molecular weight distribution. Monomolecular layer of PABA16 with narrow molecular weight distribution forms the large circular domain whereas existence of many angular domains for monolayer of PABA16 with broad one.
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