Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters - Archive ouverte HAL
Article Dans Une Revue Express Polymer Letters Année : 2013

Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters

Résumé

A reactive rotational molding (RRM) process was developed to obtain a PA6 by activated anionic ring-opening polymerization of epsilon-caprolactam (APA6). Sodium caprolactamate (C10) and caprolactam magnesium bromide (C1) were employed as catalysts, and difunctional hexamethylene-1,6-dicarbamoylcaprolactam (C20) was used as an activator. The kinetics of the anionic polymerization of epsilon-caprolactam into polyamide 6 was monitored through dynamic rheology and differential scanning calorimetry measurements. The effect of the processing parameters, such as the polymerization temperature, different catalyst/ activator combinations and concentrations, on the kinetics of polymerization is discussed. A temperature of 150 degrees C was demonstrated to be the most appropriate. It was also found that crystallization may occur during PA6 polymerization and that the combination C1/C20 was well suited as it permitted a suitable induction time. Isoviscosity curves were drawn in order to determine the available processing window for RRM. The properties of the obtained APA6 were compared with those of a conventionally rotomolded PA6. Results pointed at lower cycle times and increased tensile properties at weak deformation.

Dates et versions

hal-00867614 , version 1 (30-09-2013)

Identifiants

Citer

Najoua Barhoumi, Abderrahim Maazouz, Mohamed Jaziri, R. Abdelhedi. Polyamide from lactams by reactive rotational molding via anionic ring-opening polymerization: Optimization of processing parameters. Express Polymer Letters, 2013, 7, pp.76-87. ⟨10.3144/expresspolymlett.2013.7⟩. ⟨hal-00867614⟩
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