Papers by Keyword: Salt-Resistance

Abstract: Geosynthetic Clay Liner, a water-proofing material which takes polymer as its carrier and bentonite as its basis, has been widely applied in the seepage-proofing projects including irrigation works, gardening and roadbed. In order to improve salt-resistance of bentonite used in Geosynthetic Clay Liner in saline environment, this paper innovatively uses chemical methods to modify the bentonite material. The experimental result shows that the optimum conditions are 100% of acrylic neutralization degree, 0.04%MBA, 1.2%KPS and holding at 70°C for 1 h. According to results of soil moisture supply capacity (MSC), swelling capacity of modified samples raises 30% ~170%.

Abstract: Novel salt-resistance superabsobent microspheres based on acrylamide (AM), 2-acrylamido-2-methylpropane sulphonic acid (AMPS) by inverse suspension copolymerization using ammonium persulfate (APS) as the initiator and N,N-methylene bisacrylamide (MBA) as the crosslinking agent and surfactant PVA as disperse agent are prepared. The experimental results of salt-resistance superabsobent microspheres show the salt absorbency decreased with the increase of salt concentration; The maximum salt absorbency is 132g/g within 75min in 0.9% NaCl solution and the effect of calcium ion on salt absorbency is much greater than that of sodium ion. FTIR indicates the structure of the acrylamide and 2-acrylamido-2- methylpropane sulphonic acid copolymer. SEM indicates that the number of the micropores largely decreased with the water/oil ratio increasing from 4% to 10%. Elemental analysis indicate that the measured values of carbon, sulfur, nitrogen, hydrogen four elements is very close to theoretical value.

Abstract: This study aims at analyzing the chemical resistance of a wide range additives in air curing fluorocarbon coatings. Scanning Electron Microscope (SEM) and Immersion tests are used to detect coatings performances. The results showed that the surface state of coating does not affect the chemical resistance. While fumed SiO₂ content in the coating is lower than 5.2%, chemical resistance are enhanced as the increasing of fumed SiO₂ content, then maintained stability as content is more than 5.2%. Chemical resistance is increased gradually while the rutile TiO₂ content of coating is less than 3.1%, and essentially unchanged while greater than 3.1%. As wax powder content increases, chemical resistance of coating decreased. Coupling agent content increases, leading to enhanced chemical resistance of the coating when coupling agent content is less than 5.8% and maintained stable while greater than 5.8%. So fumed SiO₂, rutile TiO₂, and coupling agent would inhance chemical resistance for coating to a certain extent, and wax powder would weaken the chemical resistance.

Abstract: In order to verify the transcription factor CBF2 gene can be induced to express in plant and improve the plant salt resistance, they were cloned from the Arabidopsis thaliana by PCR according to CBF2 gene sequence published on GenBank. The plant expression vector (pBI-rd29A-CBF2) with CBF2 gene was constructed. The CBF2 gene was transformed into soybean plants via Agrobacterium-mediated transformation. It approved that the CBF2 gene had been transformed and integrated into the genome of soybean by PCR and Southern blot. Through the physiological test of salt resistance, the relative electric conductivity of the transformed plants plasma membrane and the control were 36.84% and 59.35% respectively under salt stress. The content of chlorophyll of the transformed plants was 2.41 times as much as that of the control. The content of proline of the transformed plants was 2.49 times as much as that of the control. It showed that the CBF2 gene was induced to express in soybean plants. And it also indicated that the expression of the CBF2 gene increased the salt stress tolerance of the transgenic soybean plants. The results proved the CBF2 gene were functional gene.