Horseradish peroxidase catalyzed the H2O2-dependent oxidation and polymerization of acetaminophen. Six acetaminophen polymers were isolated from horseradish peroxidase reaction mixtures by semipreparative high pressure liquid chromatography. Chemical structures were determined by a combination of electron impact and chemical ionization mass spectrometry and 500-MHz proton magnetic resonance spe...

The p-xylylene monomers of parylene N, C and D have similar high polymerization reactivity. For effective copolymerization processes this fact is basically a drawback and for instance the copolymerization with styrene doesn't go at all (Corley et al. J Pol Sc 13(68):137-156, [15]). Substitution of terminal hydrogen atoms by chlorine atoms reduces reactivity dramatically. 7,7,8,8-tetrachloro-p-x...

While the traditional and popular realm of polymer synthesis is the liquid phase, the use of vapor-based techniques to deposit polymers has been met with increasing interest over the past decades. The perhaps most relevant example, the deposition of poly(p-xylylenes) via the Gorham process, has been of industrial use in the fabrication of isolating or protective coatings in electronics and biom...

Hollow polymeric nanocapsules have attracted great interest in recent years due to their broad applications in controlledrelease carriers, catalysis, nanoreactors, and encapsulation of guest molecules. Polymeric nanocapsules have been typically fabricated via the selfassembly of block copolymers, 5 polymerization within lipid vesicles, emulsion polymerization, 14 and the sacrificial core-templa...

Butene-1 is produced from ethylene by dimerization reaction in a CSTR. Due to the exothermic reaction, serious temperature runaway occurs in the reactor. Therefore, it is important to stabilize the reaction temperature in order to maintain good quality product and safe operation. Temperature stabilization is also essential for maintaining optimal operation of high ethylene conversion and desire...

The polymerization dynamics of double-stranded polymers, such as actin filaments, is investigated theoretically using simple chemical kinetic models that explicitly take into account some microscopic details of the polymer structure and the lateral interactions between the protofilaments. By considering all possible molecular configurations, the exact analytical expressions for the growth veloc...

The polymerization by radiofrquency (RF) plasma of different monomers (methyl methacrylate (MMA), tetraglyme and 2-hydroxyethyl methacrylate (HEMA)) has been carried out. The plasma gas was investigated by optical emission spectroscopy (OES) in the UV-vis wavelength rang. The excited species formed in the plasma were identified for the different monomers. From computer simulations of the ro-vib...

A polystyrene-b-poly(methylmethacrylate) (PS-b-PMMA) modified with a fluorine-containing functional group at its chemical junction was designed to study the effect of on microphase separation behavior. Various molecular weights and unmodified PS-b-PMMA were synthesized, effective χ parameter for them estimated by small-angle X-ray scattering. The clearly observed in measured parameters block co...

INTRODUCTION: Poly(ether-ether-ketone) (PEEK) is considered to be promising novel polymer biomaterial for orthopaedic and spinal applications, because PEEK exhibits excellent mechanical properties, chemical stability, non-magnetic nature, and compatible with reinforcing agents such as carbon fibers, as compared with polyethylene or metallic materials. However, since conventional PEEK cannot sat...

Crawling motion is ubiquitous in eukaryotic cells and contributes to important processes such as immune response and tumor growth. To crawl, a cell must adhere to the substrate, while protruding at the front and retracting at the rear. In most crawling cells protrusion is driven by highly regulated polymerization of the actin cytoskeleton, and much of the biochemical network for this process is...