Polymer Bulletin
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#1Ivan StefanovicH-Index: 9
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This work was focused on the synthesis of polyurethane networks (PUNs) based on polycaprolactone (PCL) as soft segment (SS) and Boltorn® aliphatic hyperbranched polyester of the second pseudo generation and 4,4′-diphenylmethane diisocyanate (MDI) as the parts of the hard segments (HS), by a two-step solution polymerization. In order to find the best ratio between HS and SS to achieve good thermal and mechanical properties, suitable hydrophobicity and morphology of the PUNs, various experimental ...
#1Daniela De Conto (UCS: University of Caxias Do Sul)H-Index: 2
#2Venina dos Santos (UCS: University of Caxias Do Sul)H-Index: 8
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Many researchers work with essential oils for several applications, such as their impregnation in polymeric films and for obtaining micro-/nanocapsules by using polymers as shell material. Polymer swelling/liquid dissolution is an extremely important property for controlled release of essential oils. Therefore, this work proposes a comparative study of swelling/dissolution interaction of polymer films immersed in different essential oils. Six polymers were used for this study: polycaprolactone (...
#1Farhang PazaniH-Index: 2
Mixed-matrix composite membrane (MMCM) made from a dense selective layer filled with various filler on the top of a porous support layer is an effective method to obtain high gas separation performance compared to the conventional mixed-matrix membrane. In this study, the high CO2-selective Pebax-1657 layer was coated onto the porous PES support layer with desirable mechanical stability, and then graphene nanoplatelets (GNPs) were embedded into Pebax selective layer at different concentrations (...
#1A. MassoudH-Index: 8
#2Hoda E. Rizk (EAEA: Egyptian Atomic Energy Authority)H-Index: 6
Last. Mohamed F. Attallah (EAEA: Egyptian Atomic Energy Authority)H-Index: 17
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In the present work, poly(acrylamide-acrylic acid)-SiO2, p(AM-AA)-SiO2, was made with a template polymerization technique induced by gamma irradiation as an initiator under an irradiation dose of 60.00 kGy. The produced hybrid polymer was investigated using different techniques such as scanning electron microscope (SEM), Fourier-transform infrared (FT-IR), thermogravimetric analysis (TGA), and X-ray fluorescence (XRF) and was applied for the separation of Y(III) and Sr(II) using column chromatog...
#1H. Norazlina (TATI University College)H-Index: 2
#2Y. Kamal (KUKTEM: Universiti Malaysia Pahang)H-Index: 3
Poly(lactic acid) (PLA) is a biodegradable plastic and grabs attention in several applications such as biomedical implantation, film, packaging and clothing. Instead, PLA itself has a characteristic of brittleness, resulting in poor mechanical properties, and its slow ability in degradation leads to waste disposal problem. The present research aims to develop material in such a way to have a good combination of properties and optimum degradation ability. The PLA nanocomposites were prepared via ...
#1Atif A. El-Gharably (Tanta University)H-Index: 2
#2El-Refaie S. Kenawy (Tanta University)H-Index: 3
Last. Yehia A.-G. Mahmoud (Tanta University)H-Index: 13
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Various pyrazole/chitosan Schiff bases derivatives (3a-f) were synthesized through the reaction of pyrazole derivatives (2a-f) with chitosan (1). The produced derivatives were characterized using FT-IR, Elemental analysis and TGA. The antimicrobial activities of Schiff bases were tested against Gram-positive bacteria (Staphylococcus aureus and Bacillus cereus), Gram-negative bacterium (Escherichia coli). Results indicated a good inhibitory activity for compound (3b) when tested against (Bacillus...
Last. Mingzhong CaiH-Index: 30
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New aromatic polyamides containing cardo groups and triphenylphosphine oxide structures were synthesized by a heterogeneous palladium-catalyzed carbonylation and condensation of bis(4-(3-iodophenoxy)phenyl)phenylphosphine oxide (BIPPO), aromatic diamines bearing cardo groups, and carbon monoxide. Polycondensations were carried out in N,N-dimethylacetamide under 1 atm of CO at 120 °C in the presence of a magnetically recyclable heterogeneous palladium catalyst and 1,8-diaza-bicyclo[5,4,0]-7-undec...
#1Hossein Asadi (IAU: Islamic Azad University, Tehran)H-Index: 1
#2Asghar Alizadehdakhel (IAU: Islamic Azad University, Tehran)H-Index: 10
Last. Fatereh Dorosti (IAU: Islamic Azad University, Tehran)H-Index: 9
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This research was conducted aimed to investigate the performance of mixed matrix membranes including polysulfone (PSF) and poly (ether sulfone) (PES) as polymers and cooper (II)-benzene-1, 3, 5-tricarboxylate (Cu-BTC) as filler with different blend ratios. The response surface methodology (RSM) was employed to design the experiments. The permeation of CO2 and CH4 gases was measured at a feed pressure of 3–9 bar. Morphology, thermal stability, spectral properties and mechanical properties of the ...
#1Nguyen Van Hoa (NTU: Nha Trang University)H-Index: 8
Last. Trang Si Trung (NTU: Nha Trang University)H-Index: 9
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Chitosan nanoparticles (CSNs) have widely studied for many potential applications as a bioactive nanomaterial because of their excellent properties, such as quantum size effect, large surface area, high mobility, and high permeability. In this study, various CSNs prepared from squid pen chitosan with different molecular weight (Mw) and degree of deacetylation (DD). The lower Mw and higher DD of initial chitosan used, the smaller size of CSNs obtained. Small size CSNs (about 30 nm) are formed fro...
#1Zbigniew GrobelnyH-Index: 11
Last. Sylwia GolbaH-Index: 13
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Cesium hydroxide monohydrate (CsOH·H2O) activated by cation complexing agents, i.e., 18C6 or C222 was applied as initiator of monosubstituted oxiranes polymerization. Propylene oxide (PO), 1,2-butylene oxide (BO), styrene oxide (SO) and some glycidyl ethers were used as monomers. All processes were carried out in tetrahydrofuran solution at room temperature. Such polymers, as PPO-diols, PBO-diols and PSO-diols, are unimodal and have molar masses Mn = 2000–5100. Their dispersities are rather high...
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