ORCID Profile
0000-0001-8221-3488
Current Organisation
Southern University of Science and Technology
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Publisher: IOP Publishing
Date: 07-2019
DOI: 10.1088/1757-899X/544/1/012058
Abstract: In this paper, the controllable crosslinking polyethylene foaming materials were established though adding foaming agent additives zinc stearate firstly. Then, the density, expansion ratio, cellular structure, gel content and compression strength of crosslinking polyethylene foaming materials were studied by changing zinc stearate content. Furtherly, those properties were researched after added nucleating agent. Experimental results showed that zinc stearate could facilitate foaming reaction and broad foaming window. Density, compression strength and gel content was decreased with zinc stearate content increased, and the expansion ratio increased with zinc stearate content increased. In addition, the compression strength was improved and cellular structure became uniform after adding nucleating agent. Generally, this material not only has the controllable property, but also has the higher mechanical property and more uniform structure.
Publisher: American Chemical Society (ACS)
Date: 11-01-2005
DOI: 10.1021/MA048465N
Publisher: Springer Science and Business Media LLC
Date: 12-2003
Publisher: MDPI AG
Date: 26-04-2022
Abstract: Although thermosetting polyphenylene oxide- (PPO) based composites with excellent dielectric properties have been widely accepted as superior resin matrices of high-performance copper clad laminate (CCL) for 5G network devices, there has been limited information regarding the composition–process–structure–property relationships of the systems. In this work, the effects of peroxide initiator concentration on the structure and dielectric properties of a free radical cured ultralow loss PPO/Triallyl isocyanate (TAIC) composite system were studied. As expected, the glass transition temperature (Tg) and storage modulus increased with the advancing of crosslinking, whereas the dielectric loss showed an “abnormal” rise with the increase in crosslink density. Extensive studies were carried out by varying the initiator contents and characterizing the structure with spectroscopy, thermal analysis, and positron annihilation lifetime spectrum (PALS) techniques. The results show that the competition of polarity, crosslink density, free volume, and free TAIC are the key factors determining the dielectric properties of the composites.
Publisher: American Chemical Society (ACS)
Date: 06-07-2005
DOI: 10.1021/BM050234G
Abstract: Poly(ester urethane)s with poly[(R)-3-hydroxybutyrate] (PHB) as the hard and hydrophobic segment and poly(ethylene glycol) (PEG) as the soft and hydrophilic segment were synthesized from telechelic hydroxylated PHB (PHB-diol) and PEG using 1,6-hexamethylene diisocyanate as a nontoxic coupling reagent. Their chemical structures and molecular characteristics were studied by gel permeation chromatography, 1H NMR, and Fourier transform infrared spectroscopy. Results of differential scanning calorimetry and X-ray diffraction indicated that the PHB segment and PEG segment in the poly(ester urethane)s formed separate crystalline phases with lower crystallinity and a lower melting point than those of their corresponding precursors, except no PHB crystalline phase was observed in those with a relatively low PHB fraction. Thermogravimetric analysis showed that the poly(ester urethane)s had better thermal stability than their precursors. The segment compositions were calculated from the two-step thermal decomposition profiles, which were in good agreement with those obtained from 1H NMR. Water contact angle measurement and water swelling analysis revealed that both surface hydrophilicity and bulk hydrophilicity of the poly(ester urethane)s were enhanced by incorporating the PEG segment into PHB polymer chains. The mechanical properties of the poly(ester urethane)s were also assessed by tensile strength measurement. It was found that the poly(ester urethane)s were ductile, while natural source PHB is brittle. Young's modulus and the stress at break increased with increasing PHB segment length or PEG segment length, whereas the strain at break increased with increasing PEG segment length or decreasing PHB segment length.
Publisher: Wiley
Date: 09-01-2019
DOI: 10.1002/APP.47442
Publisher: Springer Science and Business Media LLC
Date: 2003
Publisher: Elsevier BV
Date: 04-2008
Publisher: Wiley
Date: 18-09-2006
DOI: 10.1002/POLB.20947
Publisher: Springer Science and Business Media LLC
Date: 29-06-2021
Publisher: American Chemical Society (ACS)
Date: 07-01-2006
DOI: 10.1021/MA0522561
Publisher: Wiley
Date: 21-01-2019
DOI: 10.1002/APP.47542
Publisher: Elsevier BV
Date: 03-2007
Publisher: Wiley
Date: 14-05-2007
Publisher: American Scientific Publishers
Date: 12-2006
DOI: 10.1166/JNN.2006.652
Abstract: Polypropylene (PP)/clay nanocomposites have been prepared via a reactive compounding approach with an epoxy based masterbatch. Compared with PP and common PP/organoclay nanocomposites, the PP/clay nanocomposites based on epoxy/clay masterbatch have higher impact strength. The phenomenon can be attributed to the epoxy phase dispersed uniformly in the PP matrix, which may act as impact energy absorber and helps to form a large damage zone, thus a higher impact strength value is achieved.
Publisher: American Chemical Society (ACS)
Date: 19-05-2006
DOI: 10.1021/JP057228Z
Abstract: Polystyrene (PS) sphere films with loosely packed arrays were prepared by plasma etching of closely packed PS sphere arrays. The size of PS spheres can be efficiently reduced with plasma etching, and surface topography can be manipulated by controlling the initial PS sphere size and the time of plasma exposure. These surfaces with loosely packed arrays provide a well-characterized model system for studying water repellency behavior. It was found that the surface hydrophobicity could be systematically tailored due to the well-defined and controlled surface topography. Sphere size and the interparticle distance between two adjacent spheres are critical factors in determining the water repellency behavior of the surface. A model based on the Cassie theory was proposed to elucidate the effect of surface topography on hydrophobicity, and the predicted contact angles agree well with the experimental results.
Publisher: Wiley
Date: 02-02-2006
DOI: 10.1002/POLB.20747
Publisher: Wiley
Date: 05-10-2005
Publisher: Elsevier BV
Date: 08-2001
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 11-2006
Publisher: Elsevier BV
Date: 08-2003
Publisher: Elsevier BV
Date: 12-2003
Publisher: Wiley
Date: 10-05-2004
DOI: 10.1002/PI.1368
Publisher: Springer Science and Business Media LLC
Date: 12-03-2020
Publisher: Elsevier BV
Date: 12-2022
Publisher: IOP Publishing
Date: 02-2023
Abstract: With the rapid development of electronic information technology in the 5G era towards high integration, short propagation delay, and elevated assembly temperatures, more academic and industrial attention has been focused on high-frequency and high-speed copper-clad laminates (CCLs). Compared with conventional polymeric matrices, thermoset polyphenylene oxide (PPO) has become one of the most attractive resins applied in high-performance CCLs (HPCCLs) because of its excellent comprehensive properties, including outstanding dielectric properties, high thermal stability, great processibility, and low moisture absorption, etc. This review focuses on the history of the development of PPO prepolymers/oligomers, PPO-based thermoset resin systems, and PPO/inorganic filler composites to optimize the dielectric constant, dielectric loss, thermal conductivity, coefficient of thermal expansion, and mechanical properties. Moreover, some current challenges of PPO-based thermoset systems have been identified, such as developing feasible solutions to ensure the anti-aging properties for long-term reliability under harsh environments of high temperature, high humidity, and even high-frequency electromagnetic radiation. In general, more in-depth investigations of PPO-based thermoset systems for HPCCLs are required in the future.
Publisher: Trans Tech Publications Ltd.
Date: 15-06-2006
Publisher: Informa UK Limited
Date: 2003
Publisher: Wiley
Date: 18-11-2006
DOI: 10.1002/APP.22596
Publisher: WORLD SCIENTIFIC
Date: 04-2005
Publisher: Wiley
Date: 25-03-2008
Publisher: Wiley
Date: 2005
DOI: 10.1002/PEN.20453
Publisher: Wiley
Date: 14-12-2023
DOI: 10.1002/PC.27209
Abstract: The mismatch of coefficient of thermal expansion (CTE) of components has created numerous reliability issues in electronic packages. Incorporating inorganic fillers into polymer matrices has been proven to be an effective way to reduce the CTE, but properly balancing CTE with other key properties of the composites is still a challenge. In the current work, negative thermal expansion Zr 2 WP 2 O 12 (ZWP) particles were prepared by a high‐temperature solid‐phase synthesis method. Polyphenylene oxide (PPO)‐based composites with different volume fractions (0, 10, 20, 30 vol%) of ZWP particles were prepared and their thermal expansion and dielectric properties were characterized. PPO/silica composites with the same volume fractions of silica were also prepared and characterized for comparison. With the content of filler increased from 0 to 30 vol%, the CTE of the PPO/ZWP composites reduced from 74.2 to 45.4 ppm/°C, which is more significant than that of the PPO/silica composites (48.0 ppm/°C with 30 vol% silica). Meanwhile, the dielectric loss of PPO/ZWP composites decreased significantly from 0.0024 (0 vol% ZWP) to 0.0018 (30 vol% ZWP) at 10 GHz, which is better than PPO/silica composites (0.0019 with 30 vol% Silica). The PPO/ZWP composites exhibit excellent comprehensive properties, which may be promising materials for high‐frequency applications in electronic packaging fields.
Publisher: American Chemical Society (ACS)
Date: 02-03-2005
DOI: 10.1021/LA047709U
Abstract: Epoxy/clay nanocomposites with a high degree of exfoliation were achieved using a so-called "slurry-compounding" process with which the dispersed state of clay in water can be successfully transferred to an epoxy matrix. In this process sodium montmorillonite was first exfoliated and suspended in water. This suspension was further treated with acetone to form a clay-acetone slurry followed by chemical modification using silane. The modified slurry was then mixed extensively with epoxy to form epoxy/nanoclay composites. It has been shown that the morphologies of clay before and after curing are quite similar and the exfoliation process is termed "slurry compounding". Furthermore, the amount of organic modifier used is only 5 wt % of clay, in contrast to conventional organoclays which normally contain at least 25-45 wt % of organic surfactant. The resulting epoxy/nanoclay composites exhibit a high degree of clay exfoliation and a better thermal mechanical property.
Publisher: Elsevier BV
Date: 2007
Publisher: Elsevier BV
Date: 08-2022
Publisher: Informa UK Limited
Date: 2003
Publisher: Elsevier BV
Date: 03-2007
No related grants have been discovered for Ke Wang.