King Strong Material Engineering Co.

Foshan, China

King Strong Material Engineering Co.

Foshan, China
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Zhao L.,King Strong Material Engineering Co. | Jin P.,King Strong Material Engineering Co. | Liao Y.,King Strong Material Engineering Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

An advanced amorphous thermosetting resin without nanophase separation was synthesized by directly casting the diglycidyl ether of bisphenol A (DGEBA) epoxy resin cured by α, ω-bisaminophenyl terminated poly(ethylene glycol) (BATPE) and phenethylamine (PEA). The stress-strain curves, dynamic mechanical thermal analysis and morphologies of impact fracture surfaces of the cured products were investigated as functions of flexible poly (ethylene glycol) segment molecular weight (MPE) without changing the content of the flexible polyether segment. The results show that the homogeneous epoxy resin without nanophase separation is available by incorporating poly (ethylene glycol) segments into epoxy crosslinked networks via chemically linking with DGEBA, beneficial for increasing strain relax rates. When MPE is extended, the glass transition temperature, the room-temperature Young's modulus and tensile strength of the cured products decrease while toughness, elongation increase. When MPE=600, the impact strength of PEA/BATPE-DGEBA increases 154.32% than that of PEA-DGEBA, and the yield point appears in the stress-strain curves, showing a typical ductile fracture.


Zhao L.,King Strong Material Engineering Co. | Jin P.,King Strong Material Engineering Co. | Liu P.,King Strong Material Engineering Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

A new kind of nonionic waterborne epoxy resin curing agent(p-PMAPEG-EP) containing hydrophilic polyether and epoxy resin segments were synthesized using bisphenol A epoxy resin(E51) and α, ω-para-phenylmethylamino polyethylene glycol(p-PMAPEG-EP). The structure of the synthesized products and emulsified particle morphology were characterized by FT-IR and SEM. The results show that p-PMAPEG exhibits excellent hydrophilic property, beneficial for the strong hydrogen bonds effect between the ether oxygen atoms in PEG chain segments and hydrogen atoms in H2O. The synthesized p-PMAPEG-EP has good property of emulsifying liquid epoxy resin and the dispersed phase average particle size of nonionic emulsions is about 50nm. Consequently, the p-PMAPEG-EP/E51 cross-linking polymer with good properties especially of low water absorption and excellent impact resistance is available, beneficial from introducing a low molecular weight hydrophilic PEG segment into the cross-linking networks via chemical linking with E51 and increased strain relax rates.


Zhao L.,King Strong Material Engineering Co. | Liao Y.,King Strong Material Engineering Co. | Liu P.,King Strong Material Engineering Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

A laminated gradient polymer with broad damping temperature was prepared using diglycidyl ether of bisphenyl A epoxy resin (DGEBA) and two kinds of curing agents, i.e. α, ω-para-phenylmethylamino polyethylene glycol(PMAPEG) and polyoxypropylene diamines (D400). The gradient polymer obtained exhibits a wide transition range spanning over 80 ℃ and peak half-width of 47.26 ℃. The influence of mixture curing agent component ratio on the morphology, mechanical behaviors and dynamic mechanical properties of PMAPEG-D400/DGEBA gradient polymers was investigated by the scanning electron microscopy, tensile testing machine and advanced extension rheometer. The results show that the homogeneous epoxy resin laminated gradient polymers without microphase separation are available. The width glass transition temperature laminated gradient polymers suit for different temperature range and with excellent mechanical properties can obtained by simply adjusting the crosslink density of the single-layer polymer. It is worth nothing that, the effective damping temperature (tanδ>0.3) of the gradient polymer is 41.54 ℃ and the gradient polymer can work in the range of room temperature.


Zhao L.Y.,King strong Material Engineering Co. | Zhan L.D.,King strong Material Engineering Co. | Zeng F.C.,King strong Material Engineering Co. | Liu P.G.,King strong Material Engineering Co.
Advanced Materials Research | Year: 2014

The micron-sized flake-shaped carbonyl iron powder (FS-CIP) was prepared by wet ball milling method with ethanol as process control agent (PCA). Influence of the ratio of ball to powder on the microstructure, microwave electromagnetic parameter and reflectivity of the FS-CIP were studied. The results show that, with the increasing of the ratio of ball to powder, grain size of FS-CIP gradually decreases and the aspect ratio increased significantly. Beneficial the anisotropy of the FS-CIP, the magnetic loss and dielectric loss performance were enhanced dramatically. Epoxy resin was applied as binder. The single-layer microwave absorbing coatings with 1.0 mm in thickness and the FS-CIP volume fraction is 30% were prepared. The lightest coating weights 2.96 kg/m2, when it meets the request of band width more than 10 GHz with in which the reflectivity less than -7.5 dB at the frequency range of 8~18 GHz. © (2014) Trans Tech Publications, Switzerland.


Zhao L.,South China University of Technology | Zhao L.,King Strong Material Engineering Co. | Zeng F.,South China University of Technology | Zeng F.,King Strong Material Engineering Co. | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

The micron-sized flake-shaped carbonyl iron powders were prepared by wet ball milling method. The microstructure and forming process of the carbonyl iron flake powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The stationary magnetic properties and microwave electromagnetic parameters at 2-18 GHz were measured. The results show that with the increase of milling time, the grain size of the carbonyl iron flake powders gradually decreases and the coercive force increases significantly. When the specific saturation magnetization is approximate, the magnetic loss and dielectric loss performance are enhanced due to the anisotropy of the flake-shaped carbonyl iron powder particles. Real part (μ′) of the relative complex permeability presents a point of intersection at 6 GHz and displays a "teeter-totter" phenomenon. With the decrease of carbonyl iron flake powders thickness, μ′ increases in 2-6 GHz and decreases in 6-18 GHz, μ″ continues to increase and its peak shifts to low frequency in 2-18 GHz. ©, 2015, Central South University of Technology. All right reserved.

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