The effect of solvent uptake on the relaxation behaviour, morphology and mechanical properties of a poly(ether ether ketone)/poly(etherimide) blend

Browne, M.M.; Forsyth, Maria; Goodwin, Andy A

doi:10.1016/s0032-3861(97)89716-9

Cited by 14 publications

(8 citation statements)

References 16 publications

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“…Thus, the mechanical properties of the multilayer were significantly closer to PEEK properties than to those of PEI. This behavior is different to previously reported results in PEEK-PEI blends, where the mechanical properties showed a clear degradation with respect to those of PEEK due to the loss of crystallinity [34,35]. Therefore, the PEEK/PEI multilayer structure presents a clear advantage regarding mechanical properties compared to standard blends where polymers are fully mixed.…”

Section: Mechanical Propertiescontrasting

confidence: 99%

Fabrication and Characterization of PEEK/PEI Multilayer Composites

et al. 2020

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Polyetheretherketone (PEEK)/polyetherimide (PEI) blends (50/50, v/v) keeping the crystal phase of PEEK have been manufactured by alternate PEEK/PEI layer stacking. This strategy avoided the complete miscibility of both polymers, keeping layers of PEEK and PEI unmixed along the sample thickness, as well as promoting the formation of a smooth interfacial layer where PEEK and PEI were mixed. The properties of this interface after processing at molten state and different times was studied by DSC, DMA, and X-Ray synchrotron. These techniques allowed monitoring the evolution of glass transition, where isolated Tg’s for both pristine polymers were observed even after long processing time. PEEK crystallinity slightly decreased during manufacturing, whereas PEEK crystal parameters did not vary. These observations show that, although the interface—the zone where both polymers are mixed—grew, layers with pristine polymers remained even after prolonged processing time. The preservation of the PEEK crystallinity was also observed in the mechanical properties of the multilayer PEEK/PEI films, which were compared with pristine PEEK and PEI films. Multilayer samples processed for shorter times rendered higher young modulus, tensile strength, and strain at break.

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Section: Mechanical Propertiescontrasting

confidence: 99%

Fabrication and Characterization of PEEK/PEI Multilayer Composites

et al. 2020

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“…This is remarkable in so far as some crystalline aromatic thermoplastic polymers, such as PEEK (34% crystallinity) can absorb larger amounts of acetone (i.e., 13.1 wt% at 35°C). As the solvent would reside in the amorphous phase, it can be predicted that this amount of solvent would result in a 70°C decrease in T g 33. The calculated T g values for PEEK have also been inserted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Nanofilled polyethersulfone as matrix for continuous glass fibers composites: Mechanical properties and solvent resistance

Aurilia¹,

Sorrentino²,

Sanguigno³

et al. 2010

Adv Polym Technol

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Polyethersulfone (PES) is high performance thermoplastic polymer; however, its applications are limited by the poor resistance to several classes of solvents. Fumed silica and expanded graphite nanoparticles were used to prepare nanofilled PES by a melt-compounding technique with the view to improve the barrier properties. Solvent uptake at equilibrium and solvents resistance of nanofilled PES compounds were investigated by three different methodologies: (1) weight increase by methylene chloride absorption in a vapor-saturated atmosphere, (2) solvent uptake of acetone at equilibrium, and (3) decay of storage modulus induced by acetone diffusion. The storage modulus decay was measured by means of dynamic mechanical analysis on samples immersed in an acetone bath. The collected data were fitted to an ad hoc model to calculate the diffusion coefficient. The produced nanofilled PES showed a significant improvement in barrier properties and considerable reduction in acetone uptake at equilibrium, in comparison with the neat PES. Nanofilled PES compounds were also used to produce continuous glass fiber composites by the film-stacking manufacturing technique. The composites exhibited, by and large, improvements in flexural and shear strength. Their solvent resistance was evaluated by measuring the variation of mechanical properties after exposure to acetone for 1 and 5 days. These tests showed that the composites produced with the nanocomposite matrix did not exhibit higher solvent resistance than those prepared with neat PES, probably because of the deterioration of the fiber/nanocomposite-matrix interfacial bond in the wet state. C

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“…16,20,34,35 Thus, higher electrolyte uptake of the binder can eventually degrade the battery performance due to softening of the binder and weak adhesion between the binder and the Si particle. Effect of calcium addition on the electrolyte-desolvation, mechanical properties, and resilience of alginate Electrolyte solvation of polymeric binders reduces the molecular interaction strength between binders or between the binder and Si particles.…”

Section: Thermodynamic Evidence For Ca-meditated Cross-links In Alginatementioning

confidence: 99%

“…Effect of calcium addition on the electrolyte-desolvation, mechanical properties, and resilience of alginate Electrolyte solvation of polymeric binders reduces the molecular interaction strength between binders or between the binder and Si particles. 16,20,34,35 Thus, higher electrolyte uptake of the binder can eventually degrade the battery performance due to softening of the binder and weak adhesion between the binder and the Si particle. Thus, we measured the electrolyte adsorption values of the binder films (Fig.…”

Section: Thermodynamic Evidence For Ca-meditated Cross-links In Alginatementioning

confidence: 99%

Improvement of desolvation and resilience of alginate binders for Si-based anodes in a lithium ion battery by calcium-mediated cross-linking

Yoon

et al. 2014

Phys. Chem. Chem. Phys.

120

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Si-based anodes in lithium ion batteries (LIBs) have exceptionally high theoretical capacity, but the use of a Si-based anode in LIBs is problematic because the charging-discharging process can fracture the Si particles. Alginate and its derivatives show promise as Si particle binders in the anode. We show that calcium-mediated ''egg-box'' electrostatic cross-linking of alginate improves toughness, resilience, electrolyte desolvation of the alginate binder as a Si-binder for LIBs. Consequently, the improved mechanical properties of the calcium alginate binder compared to the sodium alginate binder and other commercial binders extend the lifetime and increase the capacity of Si-based anodes in LIBs.

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The effect of solvent uptake on the relaxation behaviour, morphology and mechanical properties of a poly(ether ether ketone)/poly(etherimide) blend

Cited by 14 publications

References 16 publications

Fabrication and Characterization of PEEK/PEI Multilayer Composites

Fabrication and Characterization of PEEK/PEI Multilayer Composites

Nanofilled polyethersulfone as matrix for continuous glass fibers composites: Mechanical properties and solvent resistance

Improvement of desolvation and resilience of alginate binders for Si-based anodes in a lithium ion battery by calcium-mediated cross-linking

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