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Ouyang X.,Harbin Engineering University | Zhong G.,Harbin Engineering University | Gao S.,Harbin Engineering University | Wei H.,Harbin Engineering University | And 2 more authors.
Materials China

The filling plays a very important role in the damping performance of damping materials and structures. The major objective of this paper is to determine the effect of the dimensions and quantity of the glass flakes on the damping factor of polyurethane materials and different damping structures, such as free damping structure and constrained damping structure, which can provide basic foundational data for the modification of damping materials and the damping structure design. The results showed glass flakes were directionally arranged and formed a multilayer laminated structure in polyurethane resin. With the addition of glass flakes, the damping factor increased due to the more energy consumption resulted from the interfacial friction between glass flakes and damping resin. But too much glass flakes led to decreasing of damping factor because of the limited interfacial friction. In addition, with the size of glass flakes increasing, the damping factor of polyurethane damping structure increased, and the rate of growth decreased. ©, 2014, Materials China. All right reserved. Source

Meng F.,Military Representative Office of Naval in 431 Factory | Wang P.,Harbin Engineering University | Li R.,Harbin Engineering University | Xie Z.,Harbin Engineering University | And 3 more authors.
Materials China

Solid buoyancy materials with different content of hollow glass microspheres was synthesized by molded forming, with bisphenolepoxy resin E51 as bulk material, methyl tetrahydrophthalic anhydride as the curing agent, hollow glass microspheres named K25 as lightweight filler. The influence of the content of glass microspheres on density, uniaxial compressive strength and resistance to hydrostatic pressure of solid buoyancy material was studied. The results showed that the introduction of microspheres with lower density could reduce the density of solid buoyancymaterial effectively. With the increasing of hollow glass microsphere content, the deviation between theoretical density and actual density increased, and the uniaxial compressive strength and resistance to hydrostatic pressure of solid buoyancy material decreased. Especially, when the content of hollow glass microsphere exceeded 18%, the decrease amplitude of the uniaxial compressive strength and resistance to hydrostatic pressure increased. ©, 2014, Materials China. All right reserved. Source

Chen R.,Harbin Engineering University | Li Y.,Harbin Engineering University | Yan M.,Harbin Engineering University | Sun X.,Harbin Engineering University | And 6 more authors.
RSC Advances

Development of an environmentally friendly and efficient marine antifouling coating is a central goal in marine antifouling. In this study, a series of novel hybrid zinc/silyl acrylate copolymers (Zn/Si-acrylate copolymers) composed of tri(isopropyl)silyl acrylate (TIPSA), zinc-2-ethylhexanoate methacrylate (Zn-monomer), ethyl acrylate and methyl methacrylate were synthesized and their surface compositions, thermal degradation and hydrolysis properties were investigated. After being immersed in seawater, the hydrolysis of TIPSA and Zn-monomer could lead to a gradual self-peeling of the Zn/Si-acrylate surfaces, which was controlled by the ratio of TIPSA to Zn-monomer. The Zn/Si-acrylate copolymers with high Zn-monomer content showed excellent performance in the resistance of diatom Phaeodactylum tricornutum (P. tricornutum) growth on the Zn/Si-acrylate films. Both the self-peeling and release of zinc compounds lead to antifouling properties, which demonstrated that Zn/Si-acrylate copolymers were an effective resin for marine antifouling in static or low flow conditions. © The Royal Society of Chemistry 2016. Source

Ma M.,Qingdao University of Science and Technology | Bai X.,Qingdao University of Science and Technology | Zong C.,Qingdao University of Science and Technology | Liu L.,Qingdao Advanced Marine Material Technology Co. | Zhang S.,Qingdao Advanced Marine Material Technology Co.
Hecheng Shuzhi Ji Suliao/China Synthetic Resin and Plastics

Poly(ester-amine salt)(PEAS) precursor powders were synthesized via esterification process with aromatic dianhydride and diamine as monomers in the mixed solvent consisting of methanol and tetrahydrofuran. Polyimide foams with uniform cells were prepared from PEAS with powder process. The structure and heat-resistant property of the polyimide foams were characterized by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR) and thermogravimetry(TG). The influences of initial heating temperature and particle size of the powders on foam density were studied. The results show that the higher the initial heating temperature, the lower the foam density, the lesser the influence of the particle size of the powders on the foam density. Source

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