Characterization of recycled polyamide 6: Effect of polypropylene and inorganic contaminants on mechanical properties |
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| Institution: | 1. Chemistry and Chemical Engineering, Royal Military College, Kingston, ON, Canada;2. Chemical Engineering Department, McGill University, Montreal, QC, Canada;1. Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 ?ód?, Poland;2. International Institute for Nanocomposites Manufacturing, WMG, University of Warwick, CV4 7AL, UK;1. Centre for Advanced Engineering Materials, School of Engineering, Robert Gordon University, Riverside East, Garthdee Road, Aberdeen, AB10 7GJ, UK;2. School of Pharmacy and Life Sciences, Robert Gordon University, Aberdeen, AB10 7GJ, UK;1. Laboratory of Polymer Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, 00014, Helsinki, Finland;2. Université de Montréal, Département de chimie, C.P. 6128, Succursale Centre-Ville, Montréal, QC, H3C 3J7, Canada;3. Université de Montréal, Faculté de Pharmacie et Département de Chimie, C.P. 6128 Succursale Centre-Ville, Montréal, QC, H3C 3J7, Canada;1. Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia, Av. Nossa Senhora das Graças, 50, 25250-020 Duque de Caxias, RJ, Brazil;2. Universidade Federal do Rio de Janeiro, Campus Xerém, Estrada de Xerém, 27, 25245-390 Duque de Caxias, RJ, Brazil;3. Departamento de Química, Universidade Federal do Espírito Santo, Av. Fernando Ferrari, 514, 29075-910 Vitória, ES, Brazil;4. Universidade Federal do Rio de Janeiro, Programa de Ciencia e Tecnologia de Polímeros/IMA, Av. Horácio Macedo, 2030, bloco J, 21941-598, Rio de Janeiro, RJ, Brazil |
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| Abstract: | Recycled polyamide 6 (PA6) from post-industrial waste fibers (PIW) and post-consumer carpet waste (PCW) are characterized in this study. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) indicate the presence of polypropylene (PP) in PCW. Furthermore, measured ash content of PCW is ca. 6 wt.%, while PIW has only 0.5 wt.% inorganic content. X-ray fluorescence (XRF) and X-ray diffraction (XRD) show that inorganic contaminants of PCW and PIW are calcium carbonate (CaCO3) and titanium dioxide (TiO2), respectively. Due to higher inorganic filler content, PCW exhibits higher melt viscosity and higher storage modulus than that of PIW. PIW has 20% higher tensile strength than that of PCW. However, a drastic 70% drop is observed in vibration weld strength of PCW, which is attributed to its PP contamination. The negative effect of PP on the weld strength of recycled PA6 is also confirmed by measuring the mechanical properties of model compounds. |
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| Keywords: | Recycled PA6 Vibration welding PP contamination Inorganic contamination |
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