In this paper, the effect of waterproof processing method on properties of calcium silicate board was studied in view of the requirement of calcium silicate board for building external wall. Experiments adopted waterborne epoxy resin in the test to do waterproof processing by three ways, which means taking the measure of waterproof processing respectively on two surfaces of the sample, on two surfaces and two lateral faces of the sample, and on all the six surfaces of the sample. The results showed that the sample could easily get wet from the side to the center, and it could only get satisfactory results when taking waterproof processing on all the six surfaces of the sample. Meanwhile, the water absorption rate of the sample decreased from 18.4% to 4.4% and its bending strength significantly got improved even after that the sample was treated separately by freeze-thaw cycles, dry-wet circulation, and soaking in hot water. Moreover, the performance of moisture deformation of the sample got reduced.
The poly(o-toluidine)/BaFe10Al2O19 (POT/BFA) composites were synthesized by in-situ polymerization of o-toluidine in the presence of BaFe10Al2O19 particles. The structure, composition and morphology and electromagnetic property of the obtained samples were characterized by means of modern testing techniques. The results indicated that BFA particles were coated effectively by POT polymer chain and some interactions between POT and BFA particles were existed in the composites. The conductivity and saturation magnetization of POT/BFA composites were smaller than those of pure polymers and pure BFA respectively. The POT/BFA composites had excellent magnetic loss (μ′′) and dielectric loss (ε′′) in the range of 1 MHz~3 GHz because of their intrinsic properties and synergistic effect between components. Hence, they could be recommended as candidates for electromagnetic wave absorption and shielding materials.
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