Thermoplastic statistical copolyamides from nine mixtures of octanelactam (OL) and ω-laurolactam (LL) and also the corresponding homopolymers (nylon-8 and nylon-12) were obtained in high yields by activated anionic copolymerization at 180°C, using sodium hydride as catalyst and N-phenylcarbamoylcaprolactam as activator. The proportions of co-units in the copolymers (freed from oligomers) were determined by elemental analysis, u.v. spectroscopy and NMR. Samples were also characterized by Tm, [n], d(g/cm3), Mn(osmotic), amino-end groups content and interplanar spacing (X-ray). The results are correlated with the molar ratio of the comonomers (OL/LL) and discussed. Minima for Tmand crystallinity were indicated for the copolymers of 50 50- 60 40 OL/LL molar compositions. © 1990.
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