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Kim, Yekyung,Rana, Dipak,Matsuura, Takeshi,Chung, Wook-Jin The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.5
<p>The innovative design and synthesis of membranes with silver incorporated surfaces open up new avenues for applied basic functions.</p> <P>Graphic Abstract</P><P>The innovative design and synthesis of membranes with surfaces modified by silver incorporated surface modifying macromolecules open up new avenues for development of antibiofouling membranes. <img src='http://pubs.rsc.org/ej/CC/2011/c1cc16217a/c1cc16217a-ga.gif'> </P>
Choe, Soon ja,Rana, Dipak,Kwak, Han Jin,Kim, Hak Lim 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.2
The effect of comonomer content and the distribution of side chain branching on thermal, viscoelastic, rheological, and mechanical properties was investigated using the ethylene 1-octene copolymer (EOC) blends, which consist of one component by the Ziegler-Natta and another by the metallocene catalysts. Two model blend systems were selected; one was composed of FA+FM, which were made using the Ziegler-Natta and metallocene catalysts, respectively, and which has a similar melt index (MI), density, and comonomer content. The other blend was composed of SF+FM, which were also made using the Ziegler-Natta and metallocene catalysts, respectively, however, despite similar MI and density they had different comonomer contents. The big difference between the Zieler-Natta and metallocene EOC's is the comonomer distribution and the length of the side chain branching. Regardless of the blending methods (solution and melt blending), the blends exhibited two distinct melting and crystallization peaks, implying that the constituents excluded one another during crystallization. A single γrelaxation shifted to a lower temperature relative to the content of metallocene EOC, thereby indicating miscibility in the amorphous region. In addition, the mechanical properties seemed to have no dependency on the comonomer content. Hence the properties of EOC blends consisting of components with a similar MI and density influenced by both the comonomer contents and the distribution of the side chain branching.
Melt Rheology of Binary Blends of Metallocene Polyethylene with Conventional Polyolefins
Choe, Soon ja,Rana, Dipak,Kwak, Han Jin 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.2
The melt rheology of the binary blends of metallocene polyethylene (MCPE) (polyethylene synthesized by metallocene catalyst) with conventional polyolefins prepared using the Ziegler-Natta catalyst was investigated. The blend pairs are MCPE with high density polyethylene (MCPE-HDPE), polypropylene (MOPE-PP), polypropylene-co-ethylene) (MCPE-CoPP), and poly(propylene-co-ethylene-co-l-butylene) (MOPE-TerPP). The analysis was based on three methods. The first analyzed the shape and diameter of the semi-circular curves in the plots of the storage melt viscosity (η') versus the loss melt viscosity (η "), representing the Cole-Cole plot. The second was based on the slopes in logarithmic plots of the dynamic storage modulus (G') versus the dynamic loss modulus (G") between the blend compositions and the pure components. The third analyzed the deviation of the plot of the log complex viscosity (log η ^*), log η ' and log η " versus the blend compositions from the linearity. As a consequence, the MCPEHDPE blend showed semi-circular curves with the same diameter in the Cole-Cole plot, linearity in the slope of the log G' versus log G" between the pure components and the blend compositions, and the rule of the mixtures between the melt viscosity and the blend compositions. In contrast, the other three blends showed a different manner. Accordingly, the MCPE-HDPE blend is miscible, however, the other blends are not, which may result from the similar chemical structure of the ethylene unit between the main and the side chain. This interpretation of the melt rheology agrees well with the morphology.
Meenakshi Sundaram Sri Abirami Saraswathi,Dipak Rana,Subbiah Alwarappan,Shanmugaraj Gowrishankar,Prabu Vijayakumar,Alagumalai Nagendran 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Poly (ether imide) [PEI] ultrafiltration membranes are coated by polydopamine (PD) and immobilizedwith silver nanoparticles (AgNPs) to improve the permeation, contaminant separation and anti-foulingproperties. The tailored membranes displayed enhanced permeability (97.2 Lm 2 h 1), hydraulicresistance (13.8 kPa/Lm 2 h 1), average roughness (43 nm), contaminant rejection (>97%) with a higherflux recovery ratio (>95%). PEI/PD/Ag membranes showed anti-biofouling property against gramnegative and gram positive bacteria and facilitated the separation of toxic contaminants. The outstandingstability of PD coating and the presence of AgNPs offer effective and safe water separation.