Tailoring the mechanical, thermal, and flammability properties of high-performance PEI/PBT blends exhibiting dual-phase continuity

Vásquez-Rendón, Mauricio; Álvarez-Láinez, Mónica

doi:10.1016/j.polymer.2018.09.012

Cited by 11 publications

(17 citation statements)

References 75 publications

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“…In previous works, the differences in thermal and viscoelastic properties between PEI and PBT, lead us to obtain PEI/PBT blends using a two‐step processing method 6,7 . In step 1, PEI was homogenized at 330°C for 10 minutes, followed by PBT addition in step 2, at 280°C during 3 minutes.…”

Section: Resultsmentioning

confidence: 99%

“…Commercial‐grade poly(ether imide) Ultem 1000, flame‐retardant poly(butylene terephthalate) Valox 310SE0, and micronized poly(tetrafluoroethylene) powders with maximum particle size of 4 μm were used to obtain binary and ternary blends under standard atmosphere in a Haake Rheomix 3000 OS internal mixer fitted with roller type rotors. Binary PEI/PBT blends fabricated by a two‐step processing method defined in our previous works 6,7 were modified with PTFE concentrations of 5, 10, and 15 wt%. Formulations were based on PEI/PBT blends with PEI concentrations greater than 50 wt% (PEI‐rich blends).…”

Section: Methodsmentioning

confidence: 99%

“…In recent works, 6,7 we fabricated HPPB between engineering thermoplastic PBT and ultra‐high‐performance polymer PEI in an internal mixer, using a two‐step melt processing method. It was found that PEI and PBT are partially miscible, and that mechanical, thermal, and flammability properties are strongly influenced by morphology changes.…”

Section: Introductionmentioning

confidence: 99%

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PTFE as a toughness modifier of high‐performance PEI/PBT blends: Morphology control during melt processing

Vásquez-Rendón

Álvarez-Láinez

2020

Polymers for Advanced Techs

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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 spheroidization Complete wetting of PTFE in PEI matrix PTFE do not interfere in partial miscibility of PEI/PBT blends Nanosized PTFE droplets inhibits PEI densification PTFE improves elongation at break and toughness of PEI/PBT blends

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PTFE as a toughness modifier of high‐performance PEI/PBT blends: Morphology control during melt processing

Vásquez-Rendón

Álvarez-Láinez

2020

Polymers for Advanced Techs

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“…As a member of the polyester family, PBT is widely used for engineering thermoplastics [ 5 ] or as a component in blends [ 6 , 7 ], copolymers [ 8 , 9 , 10 ], and composites [ 11 , 12 , 13 ]. However, for high-performance applications, PBT needs to be enhanced through combination with other polymers and the use of reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Supermolecular Structure of Poly(Butylene Terephthalate) Fibers Formed with the Addition of Reduced Graphene Oxide

et al. 2020

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Nanocomposite fibers based on poly(butylene terephthalate) (PBT) and reduced graphene oxide (rGO) were prepared using a method able to disperse graphene in one step into a polymer matrix. The studies were performed for fibers containing four different concentrations of rGO at different take-up velocities. The supermolecular structures of the fibers at the crystallographic and lamellar levels were examined by means of calorimetric and X-ray scattering methods (DSC, WAXS, and SAXS). It was found that the fiber structure is mainly influenced by the take-up velocity. Fibers spun at low and medium take-up velocities contained a crystalline α-form, whereas the fibers spun at a high take-up velocity contained a smectic mesophase. During annealing, the smectic phase transformed into its α-form. The degree of transformation depended on the rGO content. Reduced graphene mainly hindered the crystallization of PBT by introducing steric obstacles confining the ordering of the macromolecules of PBT.

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“…High pore quantity and low membrane thickness have been a compensatory factor for the homogeneous pore of the PEI membrane as well as better induction of membrane mechanical resistance. In addition, PEI has high chemical and thermal stability (± 500 ˚C) [15], [16]. Despite having higher thermal stability than PVDF, the chemical resistance of the PEI membrane lies below the PVDF membrane.…”

Section: Introductionmentioning

confidence: 99%

Development of a New Polymer Membrane: Polyvinylidene fluoride/Polyetherimide Blend Membrane

Kusumawati

Santoso

Wibawa

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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Porous polyetherimide (PEI)/polyvinylidene fluoride (PVDF) coated flat sheet membranes with different compositions and polyethene glycol (PEG) pyrogenic additives have been prepared by non-solvent induced phase separation for the separation of metal salts and sucrose. By using non-solvent induction phase separation (NIPS), it has succeeded in preparing new members of mixed matrix PVDF membrane with (i) asymmetry pore structure, (ii) porosity 7.19%-18.93%, (iii) pore size 0.196 nm-0.453 nm and (iv) mechanical strength 4262.04-24472.57 N/m2, (vi) permeability respectively of 500.48 L/m2.h.bar for C12H22O11; 642.94 L/m2.h.bar for NaCl; 623.64 L/m2.h.bar for MgCl2; 1060.39 L/m2.h.bar for CaCl2; and 1292.85 L/m2.h.bar for CuSO4. Specifically, increasing PEI levels up to 2(wt.%) - 8 (wt.%) has reduced overall porosity and pore size, thus having a specific impact on mechanical strength, pure water permeability (PWF) and the permeability of the feed solution. The opposite phenomenon is observed when the PEI level reaches 10 (wt.%) - 14 (wt.%). Furthermore, compared to pure PEI membranes, PVDF/PEI composite membranes were observed to have a higher resistance to acids and lower to bases. This condition applies in contrast to pure PVDF membranes. Despite having moderate chemical resistance, PEI/PVDF membranes have excellent characteristics and separation performance compared to pure membranes. This demonstrates its promising potential for separation of soluble metal salts and sucrose produced by various industrial processes compared to PVDF and PEI membranes.

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Tailoring the mechanical, thermal, and flammability properties of high-performance PEI/PBT blends exhibiting dual-phase continuity

Cited by 11 publications

References 75 publications

PTFE as a toughness modifier of high‐performance PEI/PBT blends: Morphology control during melt processing

PTFE as a toughness modifier of high‐performance PEI/PBT blends: Morphology control during melt processing

Supermolecular Structure of Poly(Butylene Terephthalate) Fibers Formed with the Addition of Reduced Graphene Oxide

Development of a New Polymer Membrane: Polyvinylidene fluoride/Polyetherimide Blend Membrane

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