Article
Materials Science, Characterization & Testing
Sen Niu, Xiaoxue Bai, Yimu Cheng, Hao Qin, Yunhe Zhang, Zhenhua Jiang
Summary: A series of PEEK-based blends with self-crosslinkable c-PEI were prepared by melt blending as high temperature dielectrics. The obtained polymer blends exhibited stable dielectric properties over a wide frequency and temperature range. The crosslinked networks in the blends efficiently restricted the movement of polymer segments, leading to suppressed dielectric loss and enhanced high temperature performance.
Article
Engineering, Chemical
Longhui Li, Mengyuan Zhou, Ruoyu Xiong, Xuyang Wang, Guancheng Shen, Shuang Sun, Yifu Chen, Tianlun Huang, Huamin Zhou, Yun Zhang
Summary: The study presents a high-safety lithium-ion battery separator with a thermal shutdown function to prevent thermal runaway. The separator is fabricated through dip-coating and thermally induced phase separation, and exhibits improved ionic conductivity and discharge capacity compared to commercial polyolefin separators. The EVA/PEEK/EVA separator ensures the safety of LIBs without sacrificing electrochemical performance.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Polymer Science
Jingwei Jiang, Zhichao Wang, Yunlong Sun, Zengxu Qian, Zengwen Cao, Zhipeng Wang, Guangyuan Zhou
Summary: This study successfully synthesized novel polymer materials with low dielectric constant, good thermal resistance, and mechanical properties, and elucidated the relationship between dielectric constant and the number of methylene groups by constructing a model. The obtained polymer material has significant application value in the field of high-frequency communications.
Article
Nanoscience & Nanotechnology
Yuhan Liu, Zijian Zhang, Xinwei Du, Yuliang Wang, Xiaohui Guo, Mengxuan Yu, Baijun Liu, Wei Hu, Li Shen, Yunfeng Lu, Guangshan Zhu
Summary: The traditional polyolefin separators used in lithium-ion batteries have limitations such as poor wetting of electrolytes and insufficient thermal stability. To overcome these limitations, a modified phase inversion technique was developed to coat polyolefin separators with poly(ether ether ketone) (PEEK) efficiently and durably. The PEEK-coated polyolefin separators exhibit comparable mechanical properties with unmodified separators, as well as outstanding thermal stability and enhanced ionic conductivity, leading to significant improvement in the electrochemical performance of prototype half cells. This modified technique provides a practical solution for next-generation separator materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Composites
Lan Jin, Jie Liu, Lixue Zhu, Jiale Ding, Yunhe Zhang, Zhenhua Jiang
Summary: By synthesizing a crosslinkable poly (aryl ether ketone) matrix and functionalizing boron nitride nanosheets, a novel nanocomposite with stable chemical bonding structure at interfaces via Diels-Alder reaction was obtained. The nanocomposites exhibit high breakdown strength, excellent dielectric stability at high temperature, significantly improved discharged energy density, and high charge-discharge efficiency. This work demonstrates that constructing crosslinked nanocomposites may be a viable way to fabricate high temperature dielectrics.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Ziyue Zhao, Jindong Zhang, Ran Bi, Chunhai Chen, Jianan Yao, Gang Liu
Summary: This study used PAEK resin with a low melting temperature to prepare laminate for CCF-PAEK composites, followed by injection of high melting temperature PEEK or SCF-PEEK for overmolding. The interface properties of the composites were affected by the interface temperature, which was adjusted by mold temperature. Higher interface temperatures resulted in better interfacial bonding between PAEK and PEEK. The melting temperature did not significantly affect the shear strength of SCF-PEEK/CCF-PAEK short beams.
Article
Materials Science, Multidisciplinary
Meiqi Ling, Kaifeng Yu, Jian Wang, Zhipeng Wang, Guangyuan Zhou
Summary: With the rapid development of 5G technology, low dielectric constant materials have a wide range of applications in microelectronic devices. In this study, a novel poly(aryl ether ketone) resin with low dielectric constant and good thermal stability, mechanical properties, and insulation properties was successfully synthesized.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Polymer Science
A. D. Drozdov, J. DeClaville Christiansen
Summary: Observations are reported on PEEK in uniaxial tensile tests, relaxation tests and creep tests at temperatures ranging from room temperature to 180 degrees C. Constitutive equations are developed for PEEK's thermo-mechanical behavior under uniaxial deformation, with adjustable parameters found by matching experimental data. Good agreement is shown between observations and results of numerical simulation, indicating similar activation energies for various responses at temperatures above the glass transition point.
Article
Materials Science, Multidisciplinary
Ufuk Abaci, Esra Coban, H. Yuksel Guney, B. Sebnem Simsiroglu, Julide Hizal, Mesut Yilmazoglu
Summary: This work focuses on evaluating the proton conductivity and dielectric properties of graphene oxide (GO) doped sulfonated poly(ether ether ketone) (SPEEK) electrolytes. The results show that the oxy-groups in the GO structure enhance proton conduction via the Grotthus mechanism, leading to a proton conductivity value four times higher than that of the pure polymer matrix. In addition, GO increases the dielectric constant through its large surface area and polar functional groups.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Deng Ming Pan, Guang Kui Zhou, Xiao Dong Zhi, Tim Hsu, Jen-taut Yeh
Summary: Nano-SiO2 particles were incorporated into PEKK polymers to prepare nanocomposite substrates for 5G communication, achieving significantly improved dielectric and linear CTE characteristics by adjusting the SiO2 loading, but excess loading over 10% led to increased porosity.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Energy & Fuels
Yunjung Kim, Yong-Jin Jang, Hyungeun Seo, Je-Nam Lee, Sang-Gil Woo, Jae-Hun Kim
Summary: With the increasing global effort to reduce fossil fuels and use environmentally friendly energy, the interest in Li-ion batteries (LIBs) is growing. A chemical surface modification was introduced for polyethylene (PE) separators in LIBs to improve their rate performance and safety. The surface modification strategy involved coating the PE separators with poly(ether ether ketone) (PEEK) using a doctor blading method, resulting in improved hydrophilicity and enhanced ionic conductivity.
Article
Materials Science, Characterization & Testing
Fei Yu, Linghan Xiao
Summary: The addition of poly(ether sulfone) modified graphene reduced the crystallinity of PEEK composites and shortened the total crystallization time. With increasing the mass ratio of PES to GE, the peak temperature and nucleation activity of f-GE(i) increased before declining.
Article
Polymer Science
Guang Kui Zhou, Xiao Dong Zhi, Deng Ming Pan, Tim Hsu, Jen-taut Yeh
Summary: Quaternary ammonium salt modified montmorillonite nano-platelets were well dispersed in poly(ether ketone ketone) polymers, resulting in 5G substrates with smaller dielectric properties and linear thermal expansion coefficient. Satisfactory dielectric constant, dielectric loss, and LCTE were obtained with an optimum loading of 3 wt% of QASMMT nano-platelets. The use of QASMMT nano-platelets significantly improved the thermal stability of the films.
MACROMOLECULAR RESEARCH
(2022)
Article
Polymer Science
Xiaoran Yang, Seiya Yokokura, Taro Nagahama, Makoto Yamaguchi, Toshihiro Shimada
Summary: This study uses molecular dynamics and a new approximation method to simulate local vibrational features and investigate the effect of intermolecular ordering on Raman spectra. The results show that intermolecular ordering does impact low wavenumber Raman spectra and X-ray diffraction.
Article
Polymer Science
Yang Yang, Bo Jiang, Yingshuang Shang, Qinfei Xu, Junjie He, Xuefeng Li, Haibo Zhang
Summary: This study synthesized fluorene-based poly(aryl ether ketone) (aPAEK) to improve the interlayer adhesion of poly (ether ether ketone) (PEEK) parts, with the tensile strength of 30 mol% fluorene-based aPAEK increased to 75 MPa and the interlayer strength of 20 wt% blends increased by 315% compared to PEEK. The selection of an appropriate molecular weight for aPAEK is crucial in maintaining the elevated tensile strength while promoting interlayer diffusion during the printing process.
Article
Chemistry, Physical
Abdul G. Al Lafi, James N. Hay
JOURNAL OF MOLECULAR STRUCTURE
(2019)
Article
Polymer Science
Abdul G. Al Lafi, Bassem Assfour, Thaer Assaad
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2020)
Article
Polymer Science
Abdul G. Al Lafi, Reem Hasan, Nedal Al-Kafri
MACROMOLECULAR RESEARCH
(2019)
Article
Spectroscopy
Abdul G. Al Lafi, Mohamed Salah Rihawy
X-RAY SPECTROMETRY
(2020)
Article
Spectroscopy
Abdul G. Al Lafi, Mohammed S. Rihawy
Summary: The study suggests the use of 2D-CM methods to analyze PIXE and RBS spectra, revealing the chemistry involved in different ion irradiation types and the impact of sulfonation on PEEK membrane structures. The techniques are promising in enriching information obtained from ion beam analysis.
X-RAY SPECTROMETRY
(2021)
Article
Materials Science, Multidisciplinary
Abdul G. Al Lafi, Bassem Assfour, Thaer Assaad
Summary: This study investigates the processing of MOF-type material MIL-101(Cr) through gamma-ray irradiation at low doses, determining 15 kGy as the optimal dose for increasing iodine adsorption by more than 40%. Results show significant particle agglomeration post-irradiation, while preserving the unit cell topology and mesoporous structure of the MOF.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Abdul G. Al Lafi, Jamal Al Abdullah, Yusr Amin, G. Alsayes, Nedal Al-Kafri
Summary: Loading NMO onto the surface of polymers changes the pH PZC of the composite, affecting its structural and morphological properties. Spectroscopic analysis tools are powerful in determining the pH PZC and studying structural changes in solid materials.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Multidisciplinary Sciences
Abdul G. Al Lafi, Ali Alzier, Abdul W. Allaf
Summary: Proton irradiation of PEEK films led to different extents of crystallization, which were characterized using wide angle X-ray diffraction and 2D correlation mapping (2D-CM). The study showed that proton irradiation favored the formation of crystal form II and altered the orientation within the films. Differential scanning calorimetry and Raman spectroscopic analysis confirmed these effects.
Article
Polymer Science
Abdul Ghaffar Al Lafi, Mohammed Amer Mougrabya, Osama Shehada
Summary: This present work focuses on using two-dimensional correlation spectroscopy (2D-COS) to analyze X-ray photoelectron spectroscopic (XPS) data, and to obtain qualitative information about the underlying physics and chemistry of the studied process. The effects of the probing incident X-ray beam on the measured samples are also explored.
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Spectroscopy
Abdul G. Al Lafi, Jamal Al Abdullah, Yusr Amin, Yara Aljbai, Hussam Allham, Asmhan Obiad
Summary: Fourier Transform Infra-Red (FTIR) spectroscopy is an important technique for understanding the structure of adsorbents and designing improved ion exchange materials. This study investigates the adsorption mechanism of U(VI)/Th(IV) and Ra(II)/Ba(II) radionuclide couples on polystyrene nano manganese dioxide (PS-NMO) composite, focusing on the effect of working solution pH. The results show that the separation of U(VI)/Th(IV) and Ra(II)/Ba(II) couples can be effectively achieved at specific pH values, and the pH also affects the structure of the composite adsorbent. FTIR spectroscopy reveals the formation of different complexes and changes in the composite structure in response to metal ions.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Polymer Science
Abdul Ghaffar Al Lafi, Atef Arfan, Dalal Alnaama, Reem Hasan, Mazen Ibrahim, Ghina Alssayes
Summary: Sulfonated poly(ether ether ketone) (SPEEK) is a high-performance and low-cost polymer electrolyte membrane that has been widely studied as a potential replacement for Nafion membranes in fuel cells and redox flow batteries. This research investigated the effects of different membrane treatments on SPEEK membranes and successfully achieved cross-linking without affecting the degree of sulfonation. The study also found solid-state sulfonation and the formation of ether links between polymer chains. It is recommended to use high degree of sulfonation membranes for harsh environment applications.
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Chemistry, Applied
Abdul Ghaffar Al-Lafi, Isam AL-Naser
Summary: In this study, 2D-COS was used to analyze FTIR spectra of milk powder with different concentrations of melamine. By sequential analysis, the appropriate FTIR band for quantitative analysis was determined.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2022)
Article
Polymer Science
Abdul Ghaffar Al Lafi, Atef Arfan, Dalal Alnaama, Reem Hasan, Thnaa Allaf, Mazen Ibrahim, Ghina Alssayes
Summary: This study provides spectroscopic evidence for the attachment of a second sulfone group on the para position rather than the meta position with respect to the first sulfone group in the sulfonation of poly(ether ether ketone) (PEEK).
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Polymer Science
Abdul Ghaffar Al Lafi, Hiba Dada, Hamdi Harmalani
Summary: This study investigated the effects of γ-rays irradiation and thermal treatments on expired PSF dialysis membranes (Helixone) in order to reuse them. Irradiation below 35 kGy or thermal treatments below 150 degrees C had no effect on the essential characteristics of the membranes. However, chemical and morphological changes started to appear at a dose of 35 kGy and a treatment temperature above 150 degrees C. The deterioration of membrane properties could be attributed to oxidation of the polymer in irradiation treatment and degradation and elution of polyvinylpyrrolidone (PVP) in thermal treatments. Reactive treatments involving reloading PVP and treatment in buffer solution at pH = 7.2 for 12 h were suggested to reactivate expired Helixone membranes, reducing PVP elution by 10%.
MACROMOLECULAR RESEARCH
(2023)
Article
Thermodynamics
Abdul G. Al Lafi, Ghina Alsayes
Summary: The article introduces the application of two-dimensional correlation mapping (2D-CM) technique in analyzing DSC curves of poly (ether ether ketone) (PEEK) samples, which helps to extract relevant information to explain the double melting behavior of PEEK.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
