The organic phase of resin composites is constituted by dimethacrylate resins, the most common monomers being the bisphenol A diglycidildimethacrylate (BisGMA), its ethoxylated version (BisEMA), triethylene glycol dimethacrylate (TEGDMA) and urethane dimethacrylate (UDMA). This study compared the homopolymers formed from the monomers used in restorative dental composites in terms of their degre...

The fixation of rat pancreas in potassium permanganate according to Luft (1) imparts a brown coloration and a strong ultraviolet absorption to the cytoplasm of the exocrine cells, but only a weak one to the nuclei. Within the latter an even paler zone surrounding the nucleoli can be observed. After the removal of the stain by means of oxalic acid, ultraviolet microscopy and the Feulgen technic ...

In this work, we develop and evaluate polycationic nanoparticles for the delivery of small interfering RNA (siRNA). Delivery remains a major challenge for translating siRNA to the clinic, and overcoming the delivery challenge requires effective siRNA delivery vehicles that meet the demands of the specific delivery strategy. Cross-linked polycationic nanoparticle formulations were synthesized us...

As a part of our continuing work to improve the flame retardance of some chain-growth polymers, by employing a reactive route, we have synthesized several unsaturated compounds containing either phosphorus (P), or both phosphorus (P) and nitrogen (N), bearing groups in different chemical environments. They included: diethyl(acryloyloxymethyl)phosphonate (DEAMP); diethyl(1-acryloyloxyethyl)phosp...

Eight isomeric networks based on equimolar terpolymers were synthesized using group transfer polymerization (GTP) and were characterized in terms of their swelling properties. Two hydrophilic monomers, the nonionic methoxy hexa(ethylene glycol) methacrylate (HEGMA) and the ionizable 2-(dimethylamino)ethyl methacrylate (DMAEMA), and a hydrophobic (nonionic) monomer, methyl methacrylate (MMA), we...

We investigate the ability of a cationic comb polymer composed of a poly(trimethylammonium iodide ethyl methacrylate) (PTMAM) backbone and uncharged poly(ethylene glycol) (PEG) teeth to stabilize aqueous silica suspensions of varying ionic strength and pH. Both PTMAM-g-PEG and its homopolymer backbone, PTMAM, are synthesized via reversible addition-fragmentation chain transfer followed by quate...

A knot polymer, poly[bis(2-acryloyl)oxyethyl disulphide-co-2-(dimethylamino) ethyl methacrylate] (DSP), was synthesized, optimized and evaluated as a non-viral vector for gene transfection for skin cells, keratinocytes. With recessive dystrophic epidermolysis bullosa keratinocytes (RDEBK-TA4), the DSP exhibited high transfection efficacy with both Gaussia luciferase marker DNA and the full leng...

Biodiesel obtained through the transesterification in methanol of vegetable oils, such as soybean oil (SO) and waste cooking (WCO), cannot be used a biofuel for automotive applications due to presence polyunsaturated fatty esters, which have detrimental effect on oxidation stability (OS). A method upgrading this material is catalytic partial hydrogenation acid methyl ester (FAME) mixture. The t...

The effects of dual use of tributylborane (TBB) and benzoyl peroxide/ N,N-dimethyl-p-toluidine (BPO/DMPT) or camphorquinone/N,N-dimethyaminoethyl methacrylate (CQ/DMAEMA), as well as BPO/DMPT and CQ/DMAEMA for comparison purposes, on postpolymerization of PMMA/MMA resin were examined from the view point of long term changes of residual MMA and molecular weight. Each resin was polymerized and an...

Nowadays, finely controlling the mechanical properties of polymeric materials is possible by incorporating supramolecular motifs into their architecture. In this context, the synthesis of a side-chain terpyridine-functionalized poly(2-(dimethylamino)ethyl methacrylate) is reported via reversible addition-fragmentation chain transfer polymerization. By addition of transition metal ions, concentr...