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Structure and morphology of lamellar crystals of two polyamides derived from 2-methylpentamethylenediamine (MPMD) and dibasic acids with 4 or 8 methylenes have been studied by transmission electron microscopy, electron diffraction and X-ray diffraction. The crystallographic unit cell of MPMD-6 is triclinic with a ˆ 4.85, b ˆ 5.90, c (chain axis) ˆ 30.4 Å, a ˆ 115.40, b ˆ 99.9 and g ˆ 61.1°, the chain axis direction is not coincident with the c ⴱ reciprocal axis. These dimensions suggest a hydrogen-bonded sheet structure with a single hydrogen bond direction and a twist of 180° in the odd diamine unit. MPMD-10 shows two crystalline structures. The most abundant being a monoclinic unit cell with a ˆ 4.79, b ˆ 5.67, c (chain axis) ˆ 36.3 Å and g ˆ 61.8°. The less abundant structure was only observed in oriented fibers and was similar to the MPMD-6 crystalline structure. Single crystals of both MPMD-6 and MPMD-10 polyamides grow preferentially along their single hydrogen bond direction.

Посилання на статтю:

Polymer Communication Structure of odd–even nylons derived from 2-methylpentamethylenediamine. Effect of the side methyl group / P. Villaseñor, L. Franco, J. Puiggalı́ // Polymer. – 1999. – N 40. – P. 6887–6892.

Polymer Communication Structure of odd–even nylons derived from 2-methylpentamethylenediamine. Effect of the side methyl group - Завантажити.