Compatibilized PC/ABS blends from solvent recycled PC and ABS polymers from electronic equipment waste

Jani Pelto (Corresponding Author), Carlos Barreto, Hany Anwar, Laura Strobl, Martin Schlummer

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
85 Downloads (Pure)

Abstract

This study encompasses the development of high-performance PC/ABS blends utilizing recycled PC (r-PC) and recycled ABS (r-ABS) polymers from waste electric and electronic equipment (WEEE) fractions heavily contaminated by flame retardants (FRs). Upgrading of mechanical properties was facilitated by addition of virgin ABS and additives. In total three different WEEE fractions -containing high concentrations of bromine, chloride and phosphorous were purified from polymers other than PC and decontaminated from halogenated contaminants by dissolution-precipitation CreaSolv® Process. In two studied cases the WEEE fractions were optically pre-sorted for PC before purification and decontamination. Gas chromatography (GC-ECD) and X-ray fluorescence (XRF) analyses were performed to validate efficient removal of contaminants from r-PC.

The targeted mechanical properties of polymers to upgrade are notched impact strength and elastic moduli. Upgrading was achieved by using the suitable compatibilizers, and, optionally by a chain extender. First, small-scale laboratory screening test series were conducted for three compatibilizers and different ABS polymers based on micro-compounding experiments. Upscaling test series based on the pre-screening data was then organized on a conventional bench scale twin-screw extruder.

SEM microstructural characterizations of the blend morphology and fractured surfaces are done to correlate structure to the mechanical properties.Dynamic mechanical analysis (DMA) and Rheological Dynamic Analysis (RDA) and Gel permeation chromatography (GPC) provided some insight to the chain branching and molecular weight distribution of r-PC, respectively. Moreover, melt rheology and solid-state mechanical properties of the compatibilized r-PC/ABS blend were thoroughly investigated.

Addition of virgin ABS polymer and a suitable compatibilizer enhance the properties of the recycled PC/ABS 60/40 blends towards virgin-like, allowing easily >55% r-PC content, or in favourable cases much higher than 75% recycled polymer content when applying significant concentration of recycled ABS from CreaSolv® together with some virgin ABS.
Original languageEnglish
Article number107969
JournalPolymer Testing
Volume120
DOIs
Publication statusPublished - Mar 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Acrylonitrile butadiene styrene
  • Brominated flame retardant
  • Compatibilizer
  • CreaSolv®
  • Polycarbonate
  • Recycling

Fingerprint

Dive into the research topics of 'Compatibilized PC/ABS blends from solvent recycled PC and ABS polymers from electronic equipment waste'. Together they form a unique fingerprint.

Cite this