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Zhang L.-P.,Guangzhou Tinci Materials Technology Co. | Zhang L.-P.,Guangzhou Tinci Silicone Technology Co. | Sun Z.-S.,Guangzhou Tinci Silicone Technology Co. | Li B.,South China University of Technology | Liu S.-M.,South China University of Technology
Xiandai Huagong/Modern Chemical Industry | Year: 2014

Open cellular MVQ/s-LDPE/SiO2 foams are prepared through a solventing-out foaming method using silane grafted low density polyethylene (s-LDPE) as a reinforcement agent and urea as a physical foaming agent. The effects of MVQ/s-LDPE mass ratios and urea amounts on the mechanical properties, compression stress relaxation and porosity of the foams are investigated. The open cell structure of pore is observed by scanning electron microscopy photographs. The result shows that the hardness, tensile strength, tear strength and compressibility modulus of MVQ/SiO2 foams increase while the compression stress relaxation decreases with increasing the amount of s-LDPE. As a result of the increase in urea amounts, the mechanical properties are weakened but the compression stress relaxation is improved. The distribution of foams became evenly and the porosity elevated. Compared with MVQ/SiO2 foams, most of the mechanical properties of MVQ/s-LDPE/SiO2 foams are improved.

Zheng C.Y.,Guangzhou Panyu Polytechnic | Zheng C.,Guangzhou University | Yin D.N.,Guangzhou Tinci Silicone Technology Co.
Advanced Materials Research | Year: 2013

The surface tension, CMC, HLB, emulsifying ability and hydrolytic stability of the polyether-modified trisiloxane surfactants were tested. The hydrolytic stability of different products was compared. © (2013) Trans Tech Publications, Switzerland.

Liu S.-M.,South China University of Technology | Sun Z.-S.,South China University of Technology | Zhang Y.,Guangzhou Tinci Silicone Technology Co. | Zhang L.-P.,Guangzhou Tinci Silicone Technology Co. | Zhao J.-Q.,South China University of Technology
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2012

Narrow-dispersed poly(aminopropyl/phenylsilsesquioxane) (PAPSQ) microspheres were prepared via the hydrolytic cocondensation of γ-aminopropyltriethoxysilane (APS) and phenyltriethoxysilane (PTES) under the action of alkali catalysts, and the effects of the APS-to-PTES molar ratio, the water-to-silicon molar ratio, the co-solvent type, the tetramethylammonium hydroxide (TMAOH) concentration and the total monomer concentration on the morphology and size of PAPSQ microspheres were explored by using a scanning electron microscope and a particle size analyzer. Moreover, the formation mechanism of the microspheres under different reaction conditions was investigated. The results indicate that (1) when ethanol is used as the co-solvent, narrow-dispersed microspheres with a diameter ranging from 0.7 to 1.0 μm are obtained at an APS-to-PTES molar ratio of 1/4, a water-to-silicon molar ratio of 50, a TMAOH concentration of 0.025 mol/L and a total monomer concentration of 0.25 mol/L; (2) with ammonia as the catalyst and with isopropanol as the co-solvent, microspheres with large size and broad distribution can be obtained; (3) only partial spherical particles may form at lower water-to-silicon molar ratio and TMAOH concentration; and (4) no spherical particles can form if the total monomer concentration is too high.

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