Vigilancia Tecnológica

This study examines how varying activator and catalyst concentrations, along with polymerization temperature, influence key parameters in anionic PA12 polymerization, including polymerization time, molecular weight, conversion rate, and structural properties. The goal is to develop a cost?effective approach for enhancing the reactive processing of thermoplastic composites using anionic polymerization techniques tailored for PA12.AbstractThis study focuses on how catalyst concentration, activator concentration, and initial polymerization temperature impact in?situ anionic ring?opening polymerization (AROP) of ??lauryllactam. Catalyst and activator roles are fulfilled by NaH and toluene?2,4?diisocyanate (TDI), respectively, with varying catalyst/activator ratios to assess the influence of a bifunctional activator on the polymerization process. The materials produced undergo a thorough analysis, with a specific emphasis on solidification time. The examination extends to scrutinizing how different concentrations of catalyst/activator and polymerization temperatures affect crucial physical and chemical parameters. The study identifies NaH?6?mol%/TDI?3?mol% as the optimal formulation for solidification among the three explored temperatures. Notably, at 180 and 200°C, PA12 exhibits enhanced monomer conversion when a catalyst/activator ratio of 1.7 or 2 is applied. These findings underscore the significant impact of the catalyst/activator ratio and their individual concentrations on the polymer's final properties. This influence extends to factors such as crystallinity, polymer chain regularity, and dynamic mechanical properties. Additionally, the experimental conditions utilized for anionic polymerization are observed to shape the characteristics of PA12.