Structural Characterization of Copolyamides Synthesized via the Facile Blending of Polyamides

Abstract

Ny6-Ny6,10 and Ny6-Ny4,6 copolyamides prepared by a facile melt mixing at 290−310 °C of carboxyl terminated Nylon6 (Ny6-COOH) with Ny6,10 or Ny4,6, were characterized by MALDI, 13C NMR, and DSC analysis. The results, from one side show how facile is the high yield synthesis of random copolyamides via the melt mixing of the corresponding polyamides. What makes the synthesis so facile is the use of a carboxyl terminated polyamide (Ny6-COOH) to attack the other polyamide (Ny4,6 or Ny6,10), as described herewith. The DSC data acquired provide a clear picture of the process. The second relevant point is about the sequence analysis of the copolyamides, made using their 13C NMR spectra. The sequence has been derived directly from chain statistics principles, avoiding the use of inadequate procedures. To our knowledge, this is the first time as far as condensation copolymers are concerned. Interesting, the sequence analysis of our copolyamides has been also performed independently, by extracting pertinent information from their MALDI spectra. The results have been found in excellent agreement with those from 13C NMR data.

Effect of crystalline form on the tribological properties of PA46/HDPE polyblends

“…The temperatures from the feed zone to the die were kept at 180, 280, 295, 295 and 280 • C, respectively. The screw speed was set at 60 rpm [14,15]. The extrudate was obtained in the form of a cylindrical rod, which was quenched in water, granulated, and then dried at 75 • C for 24 h in an oven [16].…”

Amphiphilic quasi-block copolymers and their self-assembled nanoparticles via thermally induced interfacial absorption in miniemulsion polymerization

“…13 C NMR spectrum of PNIPAM/PSMA quasi-block copolymer (sample NP11) is shown in Fig. 16,17 In particular, the spectra shows additional splittings, and new peaks (4, 5, 6, and 7) are clearly observed. The carbon of methylene group adjacent to the oxygen atom shows a chemical shi at 64 ppm (b), which exhibits a sharp peak and is not inuenced by components and stereostructure.…”

Study of synthetic aliphatic copolyamides by time-of-flight matrix assisted laser desorption/ionization mass spectrometry

“…The copolyamides represented two pairs of compounds prepared from two different diamines and one dichloride of dicarboxylic acid (1, 2), or from one diamine and two different dichlorides (3,4). The reactants were used with out preliminary removal of moisture, water molecules be ing actually involved in chain termination.…”

“…In par ticular, MALDI mass spectrometry has been used to de termine the molecular mass distribution of nylon 6 and products of its cleavage with amines or acids, 1 to establish the nature of the end groups in nylon 6, 2 and to study thermal trans reactions in a mixture of nylon 6,6 with nylon 6,10. 3, 4 Of particular interest, however, is to eluci date the scope of this method for investigation of co polyamides, both synthetic and those formed upon trans reactions of homopolyamides.…”