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- Title
PTFE as a toughness modifier of high‐performance PEI/PBT blends: Morphology control during melt processing.
- Authors
Vásquez‐Rendón, Mauricio; Álvarez‐Láinez, Mónica Lucía
- Abstract
High‐performance PEI/PBT blends are brittle because of phase distribution and blends densification. New morphologies developed by adding PTFE to PEI matrix during melt processing favor the toughness improvement of PEI/PBT blends. Ternary PEI/PBT/PTFE processability is not compromised by PTFE addition, and miscibility study by modulated differential scanning calorimetry and harmonic mean method shows that PTFE does not interfere with PEI and PBT interaction. Dual‐phase and spore‐like morphologies are formed for both PEI/PBT and PEI/PBT/PTFE blends, and they strongly influenced their mechanical performance. Although tensile strength of ternary blends does not decrease by PTFE addition, elongation at break deteriorates for blends with PEI concentrations <70 wt%. Nevertheless, blends with 80 wt% increase their ductility, and a synergic effect is observed in impact resistance results. PTFE acts as an impact modifier of PEI/PBT blends due to its distribution in the PEI matrix as debonded spheres and nanoparticles well‐embedded in PEI matrix. Highlights: Step‐by‐step melt processing enhances PTFE powders spheroidizationComplete wetting of PTFE in PEI matrixPTFE do not interfere in partial miscibility of PEI/PBT blendsNanosized PTFE droplets inhibits PEI densificationPTFE improves elongation at break and toughness of PEI/PBT blends
- Subjects
DIFFERENTIAL scanning calorimetry; MIXING; TENSILE strength
- Publication
Polymers for Advanced Technologies, 2021, Vol 32, Issue 2, p714
- ISSN
1042-7147
- Publication type
Article
- DOI
10.1002/pat.5124