Polyamides solvents

Experimental conditions I Silica gel CS solvent VII ethyl acetate-butanone-formic acid-water (50 + 30+ 10+ 10) [119]. II Polyamide solvent water-ethanol-butanone-acetylacetone (65 +15+15+5) [20]. Ill Polyamide solvent benzene-methanol-butanone (60+ 20+ 20) [25]. IV Cellulose layer solvent Partridge mixture. 

Fig. 196. Two-dimensional chromatogram on polyamide. Solvent 1 water-ethanol-butanone-acetylacetone (65 + 15 + 15 + 5) solvent 2 chloroform-methanol-butanone (60 + 26 + 14) (almost water-saturated).

Exhaustive solvent extraction of the extruder blended products with triflouroethanol (TFE), a polyamide solvent, indicated that a substantial amount of unextractable PA6 was usually bound to the reactive rubbers via the graft-coupling reactions. In the case of PA6/ maleated EPR (80/20) blend, >20% of PA6 is bound to the rubber as a graft copolymer. In the case of the PA6 blend compounded with 20% zinc ionomer of ethyiene-methacrylic acid copolymer (E-MAAZn), the TFE extraction indicated only <3% bound PA6. However, the blend showed a moderate torque increase in the Rheomixer experiment. These results indicate that the E-MAAZn ionomer does not bond covalently with the polyamide chains, but more likely interacts via a simple associative interaction occurring at the interface. 

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