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Synergistic contribution on flame retardancy by charring production in high‐performance PEI / PBT / PTFE ternary blends: The role of PTFE
Author(s) -
VásquezRendón Mauricio,
RomeroSáez Manuel,
Mena Jhorman,
Fuenzalida Victor,
Berlanga Isadora,
ÁlvarezLáinez Mónica L.
Publication year - 2021
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.5198
Subject(s) - charring , materials science , intumescent , fire retardant , tetrafluoroethylene , composite material , ternary operation , x ray photoelectron spectroscopy , chemical engineering , differential scanning calorimetry , thermogravimetric analysis , cone calorimeter , polymer chemistry , polymer , copolymer , pyrolysis , char , physics , computer science , engineering , thermodynamics , programming language
High‐performance binary blends between poly(ether imide) (PEI) and flame‐retardant poly(butylene terephthalate) (PBT) are modified with 5, 10, and 15 wt% of poly(tetrafluoroethylene) (PTFE) using a two‐step melt‐processing method. Morphology study reveals that PTFE does not interfere with PEI and PBT interfacial interaction during blends fabrication, and the dual‐phase inversion observed for binary PEI/PBT blends in previous works remains the same. Thermal degradation and fire resistance analyses show that charring layer formation is the major flame protection process and that PTFE enhances charring production for ternary blends. According to UL94 horizontal burning test, all blends are categorized as slow‐burning materials. Bomb calorimetry and thermal gravimetric analyses reveal that there is an interaction between PTFE with PEI and PBT phases, as well as with their degradation products. This phenomenon is explained by X‐ray photoelectron spectroscopy analysis, and it is attributable to Sb‐F species which enhances the formation of an intumescent layer.