Ball milling preparation and characterization of poly (ether ether ketone)/surface modified silica nanocomposite

In this study, we mainly investigate the solid-state foaming of polyether ether ketone (PEEK) with different crystallinities using supercritical CO 2 as a physical blowing agent. The gaseous mass-transfer and thermophysical behaviors were studied. By altering the parameters of the foaming process, microcellular foams with different cell morphologies were prepared. The effect of crystallization on the cell morphology was also investigated in detail. The results indicate that the crystallization restricts gas diffusion in the material, and the thermophysical behaviors of the saturated PEEK sample with low crystallinity presents two cold crystallization peaks. The cell density decreases and the cell size increases as the saturation pressure increases. The cell density of the microcellular foams prepared under 20 MPa is 1.23 3 10 10 cells/cm 3 , which is almost 10 times compares to that under 8 MPa. The cell size increases as the foaming time extends or the foaming temperature increases. It is interesting that the cell morphology with a bimodal cell-size distribution is generated when the samples are foamed at temperatures higher than 3208C for a sufficient time. Additionally, nanocellular foams can be obtained from a highly crystallized PEEK after the decrystallization process.

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“…The characteristic temperatures and the enthalpy values are obtained by DSC curves. The crystallinity was calculated by the following formula:

X_{normalc} = \frac{Δ H_{normalm} −Δ H_{cc}}{Δ H_{normalm}^{normalo}} \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO₂

Yang

Zhang

et al. 2015

J of Applied Polymer Sci

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“…Recently, several natural and biodegradable polymers have been successfully blended with nanoparticles by the HEBM process, such as poly(ether ether ketone) , polystyrene , polyethylene , poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) , and so on. Poly(butylene terephthalate) (PBT) is one of the semi‐crystalline thermoplastic polymers which has been widely used in engineering applications due to its superior mechanical and thermal properties .…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nano‐Sb₂O₃/poly(butylene terephthalate) composite powders based on high‐energy ball milling

Yang

Niu

et al. 2018

Vinyl Additive Technology

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In this work, a kind of composite powders with good dispersion and distribution of nano-Sb 2 O 3 particles in poly(butylene terephthalate) (PBT) was prepared by the high-energy ball milling (HEBM). The effects of the milling time on the structure, morphology, particle size distribution, and thermal behavior of the nano-Sb 2 O 3 /PBT composite powders were characterized by Fourier transform infrared spectroscopy, scanning electron microscope, laser diffraction particle size analyzer, and thermal analysis (TGA, DTG and DSC) techniques. The results showed that the regular shape of PBT powders was converted into flakes and the nano-Sb 2 O 3 particles were well deagglomerated and better dispersed in the PBT matrix during the HEBM process. The mechanochemical activation that was provided by the HEBM process caused a reduction in the molecular weight of PBT, which result in favoring the first step of thermal degradation. Furthermore, two T g 's were obtained in the case of the nanocomposite powders when the milling time was over 3 h, one of them being slightly higher than that of the pure PBT, which indicated that there was a special interaction between PBT and nano-Sb 2 O 3 particles. However, the HEBM process leaded to a decreasing of the PBT crystallinity. J. VINYL ADDIT. TECHNOL., 25:91-97, 2019.

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“…The introduction of silica nanoparticles into PEEK matrix led to materials having potential applications in various industries. These nanocomposites exhibit significant enhancements in mechanical, electrical, and thermal properties and can be used in marine, automobile, aeronautical, aerospace, and other engineering applications that demand an excellent combination of mechanical and thermal properties . Up to now, very little information is known about the preparation of PEEK nanocomposites through solution methods.…”

Section: Introductionmentioning

confidence: 99%

Thermal, Electrical, and Gas Transport Properties of New Aromatic Poly(Ether Ether Ketone)/Silica Hybrid Films

Hamciuc¹,

Hamciuc²,

Rusu³

et al. 2017

Polymer Composites

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New hybrid films were prepared through a sol–gel process starting from a poly(ether ether ketone)‐containing pendant carboxyl groups (PEEK‐R) and various alkoxysilanes (tetraethoxysilane, methyltrietoxysilane, and phenyltriethoxysilane) as precursors of the inorganic network. PEEK‐R was synthesized from 4,4′‐difluorobenzophenone and a mixture of phenolphthalein and phenolphthalin. Owing to the presence of polar phthalide and carboxyl groups in the PEEK‐R structure, the hybrid films showed homogeneous morphologies. The films exhibited good thermal stability, having initial decomposition temperature over 440°C and a glass transition of 180–218°C. The contact angle values of film surfaces with water and ethylene glycol increased by the introduction of silica. The dielectric spectroscopy analysis at lower temperature evidenced two secondary relaxation processes, γ and β. At higher temperature, a conductivity relaxation was observed. The thermal activation energy of conductivity was in the range of 0.6–1.02 eV, confirming the electronic conduction via hopping. Gas permeation tests using small molecules (He, N2, O2, and CO2) indicated that hybrid films showed higher permeability than pure polymer film for all tested gases. The permeability increase was accompanied by a slight reduction in selectivity, but CO2/N2 selectivity remained significantly high making this type of hybrid materials promising candidate for gas separation membranes. POLYM. COMPOS., 39:E1544–E1553, 2018. © 2017 Society of Plastics Engineers

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Ball milling preparation and characterization of poly (ether ether ketone)/surface modified silica nanocomposite

Cited by 61 publications

References 25 publications

Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO₂

Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO₂

Preparation and characterization of nano‐Sb₂O₃/poly(butylene terephthalate) composite powders based on high‐energy ball milling

Thermal, Electrical, and Gas Transport Properties of New Aromatic Poly(Ether Ether Ketone)/Silica Hybrid Films

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Ball milling preparation and characterization of poly (ether ether ketone)/surface modified silica nanocomposite

Cited by 61 publications

References 25 publications

Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO2

Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO2

Preparation and characterization of nano‐Sb2O3/poly(butylene terephthalate) composite powders based on high‐energy ball milling

Thermal, Electrical, and Gas Transport Properties of New Aromatic Poly(Ether Ether Ketone)/Silica Hybrid Films

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Product

Resources

About

Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO₂

Effects of processing parameters and thermal history on microcellular foaming behaviors of PEEK using supercritical CO₂

Preparation and characterization of nano‐Sb₂O₃/poly(butylene terephthalate) composite powders based on high‐energy ball milling