The
oily wastewater generated in the industrial field is adversely
affecting the environment, while the current methods for oil–water
separation are complex and costly. Therefore, it is significant to
use low cost and environmentally friendly materials to prepare a smart
responsive superhydrophobic coating for the effective separation of
oil–water mixtures. In this paper, a fluorine-free copolymer
with pH responsiveness was fabricated by a solution impregnation method,
and it was compounded by silica nanoparticles/polydimethylsiloxane
to prepare a superhydrophobic coating on the paper and cotton fabric.
The prepared superhydrophobic coating remained in the superhydrophobic
state after the alkali treatment, while it would be converted into
the hydrophilic state after the acid treatment. Therefore, the pH-responsive
superhydrophobic coating will be applied in controlled selective oil–water
separation.
Recycled packaging-waste polyethylene (WPE) was used to replace the ordinary polymer modifier in the modification of raw asphalt, and the pavement properties of the modified asphalt were studied. The high-temperature stability, anticracking properties at low temperature, life span, and stability against water of the asphalt mixture were improved, a finding which is attributed to the properties and characteristics of WPE, the swelling of sheared WPE, and the WPE/ asphalt network structure. The use of packaging WPE can improve the pavement properties of asphalt, as well as save resources and reduce white pollution. J. VINYL ADDIT. TECHNOL., 20:31-35, 2014.
The polynomial regression method is employed to calculate the relationship of device color space and CIE color space for color characterization, and the performance of different expressions with specific parameters is evaluated. Firstly, the polynomial equation for color conversion is established and the computation of polynomial coefficients is analysed. And then different forms of polynomial equations are used to calculate the RGB and CMYK's CIE color values, while the corresponding color errors are compared. At last, an optimal polynomial expression is obtained by analysing several related parameters during color conversion, including polynomial numbers, the degree of polynomial terms, the selection of CIE visual spaces, and the linearization.
Packaging wastes not only pollute the environment, but also waste resources. In this study, bags of suits made mainly from ethylene(vinyl acetate) copolymer (EVA), as the modifier, were used to improve the properties of raw asphalt. On the basis of the common physical modification, crosslinking agents and catalysts were added to the raw oil asphalt. The modification technologies were studied carefully. The results showed that crosslinking agents and catalysts could make the polymer react with raw asphalt, thus providing chemical connections between them and forming three-dimensional network structures. As a result, the asphalt performance was improved. In addition, the dosages of the crosslinking agent, modification temperature, and time also had effects on the performance of the modified asphalt. When the ratio of divinylbenzene to asphalt was 0.0125, the ratio of catalyst to asphalt was 0.025, the temperature was 1408C, and the modification time was 2.5 h, the softening point of the asphalt rose from 49.58C to 63.58C, and the penetration degree dropped from 68.5 to 39.1 (0.1 mm). The results showed that after the modification with waste EVA, the performance of the asphalt had been significantly improved and stabilized. J. VINYL ADDIT. TECHNOL.,
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